JP2020139550A - Gas vaporization system - Google Patents

Abstract

To provide a gas vaporization system using a heat pump system.SOLUTION: A gas vaporization system 1 comprises an underground heat exchanger 11, a water-air heat exchange unit 12, a heat pump device 13, a first flow passage 21, a second flow passage 22, a third flow passage 23, and a first motor-operated valve 31. The first flow passage 21 connects the underground heat exchanger 11 and the water-air heat exchange unit 12. The second flow passage 22 connects the water-air heat exchange unit 12 and the heat pump device 13. The third flow passage 23 connects underground heat exchanger 11 and the heat pump device 13. The first motor-operated valve 31 switches between a case where first liquid 81 is passed to the water-air heat exchange unit 12 from the underground heat exchanger 11 via the first flow passage 21, and a case where the first liquid 81 is passed to the heat pump device 13 from the underground heat exchanger 11 via the third flow passage 23.SELECTED DRAWING: Figure 1

Description

The present invention relates to a gas vaporization system that vaporizes liquefied gas.

Conventionally, a gas vaporization system that vaporizes gas by heating liquefied gas such as liquefied natural gas, liquefied argon, liquefied nitrogen, liquefied oxygen, liquefied ethane, and liquefied ethylene by heat exchange with a liquid for heat exchange is known. Has been done. For example, the vaporizer described in Patent Document 1 includes a boiler device and a vaporizer. The hot water heated by the boiler device is introduced into the vaporizer. A heat transfer tube portion is provided in the vaporizer. The heat transfer tube section guides the liquefied natural gas. The liquefied natural gas flowing through the heat transfer tube is vaporized by heat exchange with hot water. Boiler equipment uses fuel.

Japanese Patent No. 6293331

However, in the vaporizer, hot water is generated by heating water by a boiler device. Therefore, the cost of fuel for driving the boiler device is high. Here, in the field of air conditioning for indoor air conditioning, there is known a heat pump device that performs air conditioning at low cost by heat exchange by a heat pump method without using fuel such as propane gas. The heat pump device uses, for example, the temperature of the first liquid heated or cooled by heat exchange with geothermal heat to heat or cool the second liquid. Then, the temperature of the second liquid heated or cooled by the heat pump device is used to heat or cool the air conditioner.

Generally, when a heat pump device is used for indoor air conditioning, it is set to heating in winter and cooling in summer. The underground temperature is almost constant throughout the year. Therefore, in winter, the first liquid can be heated by geothermal heat, the second liquid can be heated by the heat pump device using the temperature of the first liquid, and the room can be heated by the temperature of the second liquid. it can. In the summer, the first liquid can be cooled by geothermal heat, the second liquid can be cooled by the temperature of the first liquid by the heat pump device, and the room can be cooled by the temperature of the second liquid.

However, when vaporizing the liquefied gas, it is necessary to heat the liquefied gas throughout the year, so it is necessary to heat the second liquid throughout the year. When the heat pump method is adopted for the gas vaporization system, in winter, the first liquid can be heated by geothermal heat, and the second liquid can be heated by the heat pump device using the temperature of the first liquid. However, in summer, the temperature of the first liquid is higher than that in the ground, so the first liquid cannot be heated by geothermal heat. Therefore, in the heat pump device, the temperature of the first liquid could not be used to heat the second liquid, and the liquefied gas could not be vaporized. Therefore, when the heat pump method was used, the liquefied gas could not be vaporized throughout the year. Therefore, the heat pump method could not be adopted for the gas vaporization system.

An object of the present invention is to provide a gas vaporization system using a heat pump system.

The gas vaporization system according to the present invention uses a heat pump system, an underground heat exchange unit that exchanges heat between the first liquid and the ground heat, an air heat exchange unit that exchanges heat between the first liquid and air, and a heat pump method. A heat pump unit that exchanges heat between the first liquid and the second liquid, and a gas vaporization unit that vaporizes the liquefied gas by heat exchange between the second liquid and the liquefied gas that have undergone heat exchange in the heat pump unit. A flow path through which the first liquid flows, a first flow path connecting the underground heat exchange section and the air heat exchange section, and a flow path through which the first liquid flows, the air heat exchange section. The second flow path connecting the heat pump section, the third flow path connecting the underground heat exchange section and the heat pump section, which is the flow path through which the first liquid flows, and the first flow path. The case where the first liquid flows from the underground heat exchange unit to the air heat exchange unit and the case where the first liquid flows from the underground heat exchange unit to the heat pump unit via the third flow path. It is equipped with a first switching unit for switching. In this case, for example, when the temperature is low and the first liquid cannot be heated in the air heat exchange section, such as in winter and at night, the first liquid is heated by the geothermal heat exchange section, and the heated first liquid is used as the first liquid. It can flow from the geothermal heat exchanger 11 to the heat pump section via the three flow paths 23. Then, the temperature of the first liquid can be used in the heat pump unit to heat the second liquid. Then, the heated second liquid can be passed through the gas vaporization unit and used for vaporizing the liquefied gas. In addition, when the temperature is high and the first liquid can be heated in the air heat exchange section, for example, in spring, summer, autumn, and daytime, the first liquid heat exchanged in the geothermal heat exchange section is used. The first liquid can be sent to the air heat exchange section through one flow path, and the first liquid can be heated in the air heat exchange section. Then, the temperature of the first liquid can be used in the heat pump unit to heat the second liquid. Then, the heated second liquid can be passed through the gas vaporization unit and used for vaporizing the liquefied gas. In this way, the heat pump method can be used to vaporize the liquefied gas throughout the year. Therefore, the heat pump method can be used for the gas vaporization system.

The gas vaporization system acquires a first temperature acquisition means for acquiring a first temperature which is the temperature of the first liquid flowing through the first flow path or the third flow path, and a second temperature which is the temperature of the outside air. The second temperature acquisition means and the first temperature determination means for determining whether or not the first temperature acquired by the first temperature acquisition means is smaller than the second temperature acquired by the second temperature acquisition means. When the first temperature determination means determines that the first temperature is smaller than the second temperature, the first switching unit is controlled to control the first switching unit and the underground heat exchange unit via the first flow path. When the first control means for flowing the first liquid to the air heat exchange unit and the first temperature determining means determine that the first temperature is not smaller than the second temperature, the first switching unit May be provided with a second control means for flowing the first liquid from the underground heat exchange section to the heat pump section via the third flow path. When the first temperature is smaller than the second temperature, which is the temperature of the outside air, it is possible to heat the first liquid in the air heat exchange section. Therefore, the first liquid can be heated by flowing the first liquid through the air heat exchange unit by the first control means. On the other hand, when the first temperature is equal to or higher than the second temperature, which is the temperature of the outside air, it is difficult to heat the first liquid in the air heat exchange section. Therefore, the second control means does not allow the first liquid to flow through the air heat exchange section, but allows the first liquid to flow directly from the geothermal heat exchange section to the heat pump section. In this way, depending on the relationship between the first temperature and the second temperature, the first liquid may flow from the geothermal heat exchange section to the air heat exchange section via the first flow path, and the ground may flow through the third flow path. The case where the first liquid flows from the medium heat exchange section to the heat pump section is automatically switched. Therefore, the user does not have to switch manually, and the convenience of the user is improved.

The gas vaporization system is a flow path through which the first liquid flows after being used for heat exchange in the heat pump section, and includes a fourth flow path connecting the heat pump section and the geothermal heat exchange section. May be good. In this case, the provision of the fourth flow path 24 allows the first liquid after being used for heat exchange in the heat pump section to flow to the geothermal heat exchanger. Therefore, for example, when the temperature in the ground is higher than that of the first liquid, the first liquid can be flowed from the heat pump section to the underground heat exchange section to heat the first liquid. Further, for example, when the temperature in the ground is lower than that of the first liquid, the first liquid is flowed from the heat pump section to the underground heat exchange section to warm the ground in the underground heat exchanger section, so that the ground is so-called. The possibility of "heat withering" can be reduced.

The gas vaporization system is a flow path through which the first liquid flows after being used for heat exchange in the heat pump section, and has a fifth flow path connecting the heat pump section and the air heat exchange section, and the first flow path. The first liquid flows from the heat pump unit to the geothermal heat exchange unit via the four flow paths, and the first liquid flows from the heat pump unit to the air heat exchange unit via the fifth flow path. A second switching unit for switching between cases may be provided. In this case, it is possible to switch between the case where the first liquid flows through the geothermal heat exchange section and the case where the first liquid does not flow. Therefore, for example, only when the temperature that can heat the ground remains in the first liquid that has flowed out from the heat pump section to the fourth flow path, the first liquid is allowed to flow through the underground heat exchange section to flow underground. Can reduce the possibility of so-called "heat withering".

In the gas vaporization system, a third temperature acquisition means for acquiring a third temperature, which is the temperature of the first liquid flowing through the fourth flow path, and a state in which the first liquid is flowing through the underground heat exchange unit. The fourth temperature acquisition means for acquiring the fourth temperature, which is the temperature of the first liquid flowing through the first flow path, and the third temperature acquired by the third temperature acquisition means are the fourth temperature acquisition. When the second temperature determining means for determining whether or not the temperature is higher than the fourth temperature acquired by the means and the second temperature determining means determine that the third temperature is larger than the fourth temperature, the said The third control means that controls the second switching unit to flow the first liquid from the heat pump unit to the underground heat exchange unit via the fourth flow path, and the third by the second temperature determination means. When it is determined that the temperature is not higher than the fourth temperature, the second switching unit is controlled to flow the first liquid from the heat pump unit to the air heat exchange unit via the fifth flow path. A fourth control means may be provided. When the third temperature is larger than the fourth temperature, the temperature of the first liquid is used in the geothermal heat exchanger section, and the ground is warmed. When the underground is warmed in the geothermal heat exchange section, the first liquid is flowed from the heat pump section to the geothermal heat exchange section via the fourth flow path, so that the ground is warmed and the ground is warmed. The possibility of a so-called "heat withering" state can be reduced. On the other hand, when the third temperature is not larger than the fourth temperature, the first liquid is taking heat from the ground in the underground heat exchange section. When the first liquid is in a state of drawing heat from the ground, the first liquid flows from the heat pump device to the air heat exchange section via the fifth flow path, so that the first liquid flows to the geothermal heat exchange section. Is not washed away. Therefore, it is possible to reduce the possibility that the underground heat exchange section is deprived of the underground heat and the underground becomes a so-called "heat withered" state.

The gas vaporization system is a flow path through which the first liquid flows after heat exchange in the air heat exchange section, and includes a sixth flow path connecting the air heat exchange section and the underground heat exchange section. When the first liquid is flowed from the air heat exchange section to the heat pump section via the second flow path, and from the air heat exchange section to the underground heat exchange section via the sixth flow path. A third switching unit may be provided to switch between the case where the first liquid flows and the case where the first liquid flows. When the first liquid is flowed from the air heat exchange section to the heat pump section via the second flow path, the temperature of the first liquid heated in the air heat exchange section can be used to heat the second liquid in the heat pump section. it can. Further, when the first liquid is flowed from the air heat exchange section to the geothermal heat exchange section, the temperature of the first liquid heated in the air heat exchange section can be used to warm the ground in the geothermal heat exchange section. .. Therefore, the possibility that the underground becomes so-called "heat withering" can be reduced.

The gas vaporization system controls the third switching unit when the vaporization of the liquefied gas by the gas vaporization unit is stopped, and from the air heat exchange unit to the ground via the sixth flow path. A fifth control means for flowing the first liquid may be provided in the medium heat exchange unit. In this case, when the vaporization of the liquefied gas by the gas vaporization unit is stopped, the temperature of the first liquid heated in the air heat exchange unit can be used to warm the ground in the geothermal heat exchange unit. Therefore, the possibility that the underground becomes so-called "heat withering" can be reduced.

The gas vaporization system is a flow path through which the second liquid flows, a seventh flow path which is a flow path connecting the heat pump section and the gas vaporization section, and a flow path through which the first liquid flows. The first liquid is flowed from the air heat exchange section to the heat pump section via the eighth flow path connecting the air heat exchange section and the gas vaporization section, and the seventh flow path. The case where the second liquid is flowed from the heat pump unit to the gas vaporization unit via the heat pump unit and the case where the first liquid is flown from the air heat exchange unit to the gas vaporization unit via the eighth flow path are switched. A fourth switching unit may be provided. When the first liquid is flowed from the air heat exchange section to the gas vaporization section via the eighth flow path, the liquefied gas can be vaporized by using the first liquid heated in the air heat exchange section. Therefore, it is not necessary to drive the heat pump unit, and the operating cost of the gas vaporization system can be reduced.

The gas vaporization system was acquired by a fifth temperature acquisition means for acquiring a fifth temperature, which is the temperature of the first liquid flowing through the second flow path or the eighth flow path, and the fifth temperature acquisition means. A third temperature determining means for determining whether or not the fifth temperature is smaller than the vaporization temperature at which the liquefied gas can be vaporized by the gas vaporizing unit, and the fifth temperature determining means for determining whether or not the fifth temperature is lower than the vaporization temperature at which the liquefied gas can be vaporized When it is determined that the temperature is lower than the vaporization temperature, the fourth switching unit is controlled to flow the first liquid from the air heat exchange unit to the heat pump unit via the second flow path, and the seventh liquid is flown. When the sixth control means for flowing the second liquid from the heat pump section to the gas vaporization section via the flow path and the third temperature determination means determine that the fifth temperature is not smaller than the vaporization temperature. The fourth control unit may be provided with a seventh control means for flowing the first liquid from the air heat exchange unit to the gas vaporization unit via the eighth flow path. In this case, when the fifth temperature is equal to or higher than the vaporization temperature, the first liquid is automatically flowed to the gas vaporization section and used for vaporizing the liquefied gas. Therefore, it is not necessary for the user to manually switch the flow path, and the convenience of the user is improved.

It is a figure which shows the structure of the gas vaporization system 1 in the first state. It is a figure which shows the electrical composition of a gas vaporization system 1. It is a figure which shows the structure of the gas vaporization system 1 in the 2nd state. It is a figure which shows the structure of the gas vaporization system 1 in the 3rd state. It is a figure which shows the structure of the gas vaporization system 1 in the 4th state. It is a figure which shows the structure of the gas vaporization system 1 in the fifth state. It is a figure which shows the structure of the gas vaporization system 1 in the sixth state. It is a flowchart of a main process. It is a continuation flowchart of FIG. It is a continuation flowchart of FIG.

Hereinafter, the gas vaporization system 1 that embodies the present invention will be described. First, an outline of the gas vaporization system 1 will be described with reference to FIG. The gas vaporization system 1 shown in FIG. 1 is a system that vaporizes the liquefied gas in the liquefied gas container 141 by using the temperature of the first liquid 81 or the second liquid 82. The liquefied gas is, for example, LNG (Liquefied Natural Gas, liquefied natural gas), liquefied argon, liquefied nitrogen, liquefied oxygen, liquefied ethane, liquefied ethylene and the like. In the present embodiment, as an example, the liquefied gas 142 is LNG. The gas obtained by vaporizing the liquefied gas 142 is sent to, for example, a power generation facility (not shown) and used for power generation or the like. In the following description, the upper side and the lower side of the paper surface of FIG. 1 are referred to as the upper side and the lower side of the gas vaporization system 1. Further, the lower side of the gas vaporization system 1 is in the direction of gravity, and the upper side is in the direction of antigravity. Further, it is assumed that the first liquid 81 and the second liquid 82 are water as an example.

The configuration of the gas vaporization system 1 will be described. The gas vaporization system 1 includes a geothermal heat exchanger 11, a water-air heat exchange unit 12, a heat pump device 13, a gas vaporization facility 14, a first flow path 21, a second flow path 22, a third flow path 23, and a fourth flow. A road 24, a fifth flow path 25, a sixth flow path 26, a seventh flow path 27, an eighth flow path 28, a ninth flow path 29, a tenth flow path 30, and the like are provided.

The geothermal heat exchanger 11 is provided so as to face downward from the ground surface 105. The underground heat exchanger 11 exchanges heat between the underground heat in the ground and the first liquid 81. The water-air heat exchange unit 12 is a device that exchanges heat between the first liquid 81 and air. The heat pump device 13 is a device that exchanges heat between the first liquid 81 and the second liquid 82 by a heat pump method.

The gas vaporization facility 14 warms and vaporizes the liquefied gas 142 by heat exchange between the first liquid 81 or the second liquid 82 flowing in from the flow path 672 and the liquefied gas 142 in the liquefied gas container 141. The first liquid 81 or the second liquid 82 used for vaporizing the liquefied gas 142 flows out into the flow path 691.

The first flow path 21 is a flow path through which the first liquid 81 flows, and connects the geothermal heat exchanger 11 and the water-air heat exchange unit 12. The first flow path 21 includes flow paths 611, 612, 613. The second flow path 22 is a flow path through which the first liquid 81 flows, and connects the water-air heat exchange unit 12 and the heat pump device 13. The second flow path 22 includes a flow path 621, 622, 623, 624.

The third flow path 23 is a flow path through which the first liquid 81 flows, and connects the geothermal heat exchanger 11 and the heat pump device 13. The third flow path 23 includes flow paths 611 and 612, flow paths 631, and flow paths 622,623,624. The fourth flow path 24 is a flow path through which the first liquid 81 after being used for heat exchange in the heat pump device 13 flows, and connects the heat pump device 13 and the geothermal heat exchanger 11. The fourth flow path 24 includes flow paths 641, 642, 643, 644.

The fifth flow path 25 is a flow path through which the first liquid flows after being used for heat exchange in the heat pump device 13, and connects the heat pump device 13 and the water-air heat exchange unit 12. The fifth flow path 25 includes flow paths 641, 642, 643, flow paths 651, and flow paths 612 and 613. The sixth flow path 26 is a flow path through which the first liquid 81 after heat exchange in the air heat exchange unit 12 flows, and connects the water-air heat exchange unit 12 and the geothermal heat exchanger 11. The sixth flow path 26 includes flow paths 621 and 622, flow paths 661, and flow paths 643 and 644.

The seventh flow path 27 is a flow path through which the second liquid 82 flows, and connects the heat pump device 13 and the gas vaporization facility 14. The seventh flow path 27 includes flow paths 671 and 672. The eighth flow path 28 is a flow path through which the first liquid 81 flows, and connects the water-air heat exchange unit 12 and the gas vaporization facility 14. The eighth flow path 28 includes a flow path 621, 622, 623, a flow path 681, and a flow path 672.

The ninth flow path 29 is a flow path through which the second liquid 82 after being used for vaporizing the liquefied gas 142 in the gas vaporization facility 14 flows, and connects the gas vaporization facility 14 and the heat pump device 13. The ninth flow path 29 includes flow paths 691,692. The tenth flow path 30 connects the flow path 642 and the gas vaporization facility 14. The tenth flow path 30 includes a flow path 691 and a flow path 701.

The geothermal heat exchanger 11 includes two U tubes 111 and 112 buried in the ground. The lower ends of the U tubes 111 and 112 are U-shaped. The first liquid 81 flows inside the U tube. One end of each of the U tubes 111 and 112 is connected to the flow path 611 at the connection point 401. The other ends of the U tubes 111 and 112 are connected to the flow path 644 at the connection point 402.

The flow path 611 is connected to the flow path 612 and the flow path 651 at the connection point 404. The flow path 612 is connected to the flow path 613 and the flow path 631 via the first motorized valve 31. The first motorized valve 31 is a three-way valve.

The flow path 613 is connected to the water-air heat exchange unit 12. The flow path 631 is connected to the flow path 621 and the flow path 622 at the connection point 403. The flow path 621 is connected to the water-air heat exchange unit 12. The flow path 622 is connected to the flow path 623 and the flow path 661 via the third motorized valve 33. The third motorized valve 33 is a three-way valve.

The flow path 623 is connected to the flow path 624 and the flow path 681 via the fourth motorized valve 34. The fourth electric valve 34 is a three-way valve. The flow path 624 is connected to the heat pump device 13. The flow path 681 is connected to the flow path 671 and the flow path 672 at the connection point 406.

The flow path 671 is connected to the heat pump device 13. The flow path 672 is connected to the gas vaporization facility 14.

The flow path 691 is connected to the gas vaporization facility 14. The flow path 691 is connected to the flow path 692 and the flow path 701 at the connection point 407. The flow path 692 is connected to the heat pump device 13.

The flow path 701 is connected to the flow path 641 and the flow path 642 via the fifth electric valve 35. The flow path 641 is connected to the heat pump device 13. The flow path 642 is connected to the flow path 643 and the flow path 661 at the connection point 405. The flow path 643 is connected to the flow path 644 and the flow path 651 via the second motorized valve 32. The second motorized valve 32 is a three-way valve.

The first electric valve 31 causes the first liquid 81 to flow from the geothermal heat exchanger 11 to the water-air heat exchange unit 12 via the first flow path 21 (see the arrow H1 in FIG. 1), and the third flow path. The case where the first liquid 81 is flown from the geothermal heat exchanger 11 to the heat pump device 13 via the 23 (see the arrow H2 in FIG. 3) is switched. The first electric valve 31 is an electric valve, and the flow path is switched by the control of the CPU 601 (see FIG. 2) described later (second electric valve 32, third electric valve 33, fourth electric valve 34, and fifth electric valve). The same applies to the valve 35).

The second electric valve 32 causes the first liquid 81 to flow from the heat pump device 13 to the geothermal heat exchanger 11 via the fourth flow path 24 (see the arrow H4 in FIG. 1), and the second electric valve 32 via the fifth flow path 25. The case where the first liquid 81 is flowed from the heat pump device 13 to the water-air heat exchange unit 12 (see arrow H3 in FIG. 4) is switched.

The third electric valve 33 allows the first liquid 81 to flow from the water-air heat exchange unit 12 to the heat pump device 13 via the second flow path 22 (see arrow H5 in FIG. 1), and the sixth flow path 26. The case where the first liquid 81 is flowed from the water-air heat exchange unit 12 to the geothermal heat exchanger 11 (see the arrow H6 in FIG. 5) is switched.

The fourth electric valve 34 causes the first liquid 81 to flow from the water-air heat exchange unit 12 to the heat pump device 13 via the second flow path 22 (see arrow H5 in FIG. 1), and passes through the seventh flow path 27. When the second liquid 82 is flowed from the heat pump device 13 to the gas vaporization facility 14 (see the arrow H10 in FIG. 1), the first liquid is flown from the water-air heat exchange unit 12 to the gas vaporization facility 14 via the eighth flow path 28. It switches between the case where 81 is flown (see the arrow H7 in FIGS. 6 and 7).

The fifth electric valve 35 causes the second liquid 82 to flow from the gas vaporization facility 14 to the heat pump device 13 via the ninth flow path 29 (see the arrow H8 in FIG. 1), and the fifth electric valve 35 via the tenth flow path 30. , The case where the first liquid 81 is flowed from the gas vaporization facility 14 to the geothermal heat exchanger 11 or the water-air heat exchange unit 12 (see the arrow H9 in FIG. 6 and the arrow H11 in FIG. 7) is switched.

The first pump 511 is provided in the flow path 612. The first pump 511 flows the first liquid 81 under the control of the CPU 601 (see FIG. 2) described later. The second pump 512 is provided in the flow path 672. The second pump 512 flows the first liquid 81 or the second liquid 82 under the control of the CPU 601 (see FIG. 2).

The first temperature sensor 521 is provided in the flow path 612. The first temperature sensor 521 outputs a signal corresponding to the temperature of the first liquid 81 flowing through the first flow path 21 or the third flow path 23 to the CPU 601. The CPU 601 acquires the temperature of the first liquid 81 flowing through the first flow path 21 or the third flow path 23 based on the output of the first temperature sensor 521.

The second temperature sensor 522 is provided at a position where the temperature of the outside air can be detected in the gas vaporization system 1. The second temperature sensor 522 outputs a signal corresponding to the temperature of the outside air to the CPU 601. The CPU 601 acquires the temperature of the outside air based on the output of the second temperature sensor 522.

The third temperature sensor 523 is provided in the flow path 643. The third temperature sensor 523 outputs a signal corresponding to the temperature of the first liquid 81 flowing through the fourth flow path 24, the fifth flow path 25, or the sixth flow path 26 to the CPU 601. The CPU 601 acquires the temperature of the first liquid 81 flowing through the fourth flow path 24, the fifth flow path 25, or the sixth flow path 26 based on the output of the third temperature sensor 523.

The fourth temperature sensor 524 is provided in the flow path 672. The fourth temperature sensor 524 outputs a signal corresponding to the temperature of the second liquid 82 flowing through the seventh flow path 27 or the temperature of the first liquid 81 flowing through the eighth flow path 28 to the CPU 601. Based on the output of the fourth temperature sensor 524, the CPU 601 acquires the temperature of the second liquid 82 flowing through the seventh flow path 27 or the temperature of the first liquid 81 flowing through the eighth flow path 28.

The fifth temperature sensor 525 is provided in the flow path 622. The fifth temperature sensor 525 outputs a signal corresponding to the temperature of the first liquid 81 flowing through the second flow path 22 or the third flow path 23 to the CPU 601. The CPU 601 acquires the temperature of the first liquid 81 flowing through the second flow path 22 or the third flow path 23 based on the output of the fifth temperature sensor 525.

The flow meter 541 is provided in the flow path 643. The flow meter 541 outputs a signal corresponding to the flow rate of the first liquid 81 flowing through the flow path 643 to the CPU 601. The CPU 601 detects the flow rate of the first liquid 81 flowing through the flow path 643 based on the output of the flow meter 541.

The electrical configuration of the gas vaporization system 1 will be described with reference to FIG. The control unit 60 is provided on a control panel (not shown). The control unit 60 includes a CPU 601, a ROM 602, a RAM 603, and the like.

The CPU 601 controls the gas vaporization system 1. The CPU 601 is electrically connected to the ROM 602 and the RAM 603. The ROM 602 stores various program data such as a program for the main process (see FIG. 8) described later. Various temporary data are stored in the RAM 603.

The CPU 601 is electrically connected to the gas vaporization facility 14. The CPU 601 controls the gas vaporization facility 14 to vaporize the liquefied gas 142 in the liquefied gas container 141. The CPU 601 sends the gas vaporized by the liquefied gas 142 to, for example, a power generation facility. Gas is used for power generation and the like.

The CPU 601 is electrically connected to the heat pump device 13. The CPU 601 controls the heat pump device 13. The CPU 601 controls the heat pump device 13 and exchanges heat between the first liquid 81 and the second liquid 82 by the heat pump method. In the present embodiment, the heat pump device 13 uses the temperature of the first liquid 81 to heat the second liquid 82.

In the present embodiment, as an example, the water-air heat exchange unit 12 (see FIG. 1) exchanges heat with the first liquid 81 by natural convection heat exchange without using a drive source such as a fan. In this case, the water-air heat exchange unit 12 does not have to be electrically connected to the CPU 601. The water-air heat exchange unit 12 may exchange heat with the first liquid 81 by forced convection heat exchange, for example, forcibly exchanging heat using a fan or the like. In this case, the water-air heat exchange unit 12 is electrically connected to the CPU 601. The CPU 601 drives the water-air heat exchange unit 12 when the first liquid 81 flows through the water-air heat exchange unit 12, and when the first liquid 81 is not flowed through the water-air heat exchange unit 12, water -The air heat exchange unit 12 may be stopped.

The CPU 601 is electrically connected to the operation unit 609. The CPU 601 acquires an instruction from the user input from the operation unit 609.

The CPU 601 includes a first electric valve 31, a second electric valve 32, a third electric valve 33, a fourth electric valve 34, a fifth electric valve 35, a first pump 511, a second pump 512, a flow meter 541, and a first temperature. It is electrically connected to the sensor 521, the second temperature sensor 522, the third temperature sensor 523, the fourth temperature sensor 524, and the fifth temperature sensor 525. The CPU 601 controls the first electric valve 31, the second electric valve 32, the third electric valve 33, the fourth electric valve 34, and the fifth electric valve 35, and switches the flow path.

In the present embodiment, as an example, the first pump 511 and the second pump 512 are pumps (for example, an inverter pump) whose flow rates of the first liquid 81 or the second liquid 82 can be adjusted. The CPU 601 controls the flow rate by the first pump 511 and the second pump 512. The CPU 601 refers to, for example, the outputs of the first temperature sensor 521, the second temperature sensor 522, the third temperature sensor 523, the fourth temperature sensor 524, and the fifth temperature sensor 525, and refers to the first pump 511 and the second pump. The flow rate of the first liquid 81 or the second liquid 82 according to 512 is adjusted.

The flow of the first liquid 81 and the second liquid 82 in the gas vaporization system 1 will be described. In the present embodiment, the CPU 601 controls the first electric valve 31, the second electric valve 32, the third electric valve 33, the fourth electric valve 34, and the fifth electric valve 35 to control the first liquid 81 and the fifth electric valve 35. (Ii) The flow path through which the liquid 82 flows is switched. As a result, the states of the gas vaporization system 1 are the first state (see FIG. 1), the second state (see FIG. 3), the third state (see FIG. 4), the fourth state (see FIG. 5), and the fifth state. It varies between (see FIG. 6) and the sixth state (see FIG. 7).

In the following description, the temperature of the first liquid 81 flowing through the first flow path 21 or the third flow path 23 is referred to as “first temperature”. The temperature of the outside air is called the "second temperature". The temperature of the first liquid 81 flowing through the fourth flow path 24 is referred to as a "third temperature". The temperature of the first liquid 81 flowing through the first flow path 21 in a state where the first liquid 81 is flowing through the geothermal heat exchanger 11 is referred to as a “fourth temperature”. The temperature of the first liquid 81 flowing through the second flow path 22 or the eighth flow path 28 is referred to as a "fifth temperature".

A case where the gas vaporization system 1 is set to the first state will be described with reference to FIG. The first state is when the temperature is high and the water-air heat exchange unit 12 can heat the first liquid 81, for example, in spring, summer, autumn, and daytime, and the first liquid 81 warms the ground. Set when it can. In the first state, the first liquid 81 is heated in the water-air heat exchange unit 12, the second liquid 82 is heated in the heat pump device 13 using the temperature of the heated first liquid 81, and the heat in the heat pump device 13 is heated. It is a state of warming the ground in the geothermal heat exchanger 11 using the temperature of the first liquid 81 after being used for replacement.

As shown in FIG. 1, in the first state, the first liquid 81 circulates through the geothermal heat exchanger 11, the water-air heat exchange unit 12, and the heat pump device 13. The first liquid 81 flows from the geothermal heat exchanger 11 to the water-air heat exchange unit 12 via the first flow path 21 (see arrow H1). In the water-air heat exchange unit 12, heat exchange between the first liquid 81 and air is performed. In the present embodiment, when the first state is continued, the first liquid 81 is heated in the water-air heat exchange unit 12.

The first liquid 81 flows from the water-air heat exchange unit 12 to the heat pump device 13 via the second flow path 22 (see arrow H5). In the heat pump device 13, heat exchange between the first liquid 81 and the second liquid 82 is performed by the heat pump method, and the second liquid 82 is heated.

The second liquid 82 heated in the heat pump device 13 flows to the gas vaporization facility 14 via the seventh flow path 27 (see arrow H10). The temperature of the second liquid 82 is used for vaporizing the liquefied gas 142 in the liquefied gas container 141. The second liquid 82 used for vaporizing the liquefied gas 142 flows to the heat pump device 13 (see arrow H8) via the ninth flow path 29 and is heated in the heat pump device 13. That is, the second liquid 82 circulates between the heat pump device 13 and the gas vaporization facility 14.

On the other hand, the first liquid 81 used for heating the second liquid 82 in the heat pump device 13 flows to the geothermal heat exchanger 11 via the fourth flow path 24 (see arrow H4). In the present embodiment, when the first state is continued, the first liquid 81 is cooled and the underground is warmed in the underground heat exchanger 11. For example, in the second state (see FIG. 3), if the state in which the first liquid 81 is heated in the underground heat exchanger 11 continues, the heat in the ground continues to be taken away. As a result, the underground may be in a so-called "heat withered" state. In order to reduce the possibility of this "heat withering" state, in the first state, the heat of the first liquid 81 that remains after being heated by the water-air heat exchange unit 12 and heat exchanged by the heat pump device 13 Is used to warm the ground in the geothermal heat exchanger 11.

In the first state, as an example, the first liquid 81 changes from 7 degrees to 15 degrees in the water-air heat exchange unit 12, changes from 15 degrees to 10 degrees in the heat pump device 13, and geothermal heat. It changes from 10 degrees to 7 degrees in the exchanger 11. Further, as an example, the second liquid 82 changes from 15 degrees to 25 degrees in the heat pump device 13, and changes from 25 degrees to 15 degrees in the gas vaporization facility 14.

A case where the gas vaporization system 1 is set to the second state will be described with reference to FIG. The second state is, for example, when the temperature is low such as in winter and at night and the first liquid 81 cannot be heated in the water-air heat exchange unit 12, and the first liquid 81 is heated in the underground heat exchanger 11. Is set when can be done. In the second state, the first liquid 81 is heated in the geothermal heat exchanger 11, the second liquid 82 is heated in the heat pump device 13 using the temperature of the heated first liquid 81, and the second liquid 82 is liquefied. It is in a state used for vaporizing the gas 142. In the second state, the first liquid 81 in the water-air heat exchange unit 12 is not heated. This is because it is difficult for the water-air heat exchange unit 12 to heat the first liquid 81 when the temperature is low, such as in winter or at night.

As shown in FIG. 3, in the second state, the first liquid 81 circulates between the geothermal heat exchanger 11 and the heat pump device 13. In the underground heat exchanger 11, heat exchange between the first liquid 81 and the geothermal heat is performed. In the present embodiment, when the second state is continued, the first liquid 81 is heated in the geothermal heat exchanger 11.

The first liquid 81 flows from the geothermal heat exchanger 11 to the heat pump device 13 via the third flow path 23 (see arrow H2). Since the water-air heat exchange unit 12 is bypassed by the third flow path 23, the first liquid 81 does not flow through the water-air heat exchange unit 12.

In the heat pump device 13, heat exchange between the first liquid 81 and the second liquid 82 is performed by the heat pump method, and the second liquid 82 is heated. Similar to the first state, the second liquid 82 circulates between the heat pump device 13 and the gas vaporization facility 14 and is used for vaporizing the liquefied gas 142 stored in the liquefied gas container 141.

The first liquid 81 after being used for heat exchange in the heat pump device 13 flows to the geothermal heat exchanger 11 via the fourth flow path 24 (see arrow H4). The first liquid 81 is heated in the geothermal heat exchanger 11. In the second state, as an example, the first liquid 81 changes from 0 degrees to 5 degrees in the geothermal heat exchanger 11 and changes from 5 degrees to 0 degrees in the heat pump device 13. Further, as an example, the second liquid 82 changes from 15 degrees to 25 degrees in the heat pump device 13, and changes from 25 degrees to 15 degrees in the gas vaporization facility 14.

A case where the gas vaporization system 1 is set to the third state will be described with reference to FIG. The third state is when the temperature is high and the water-air heat exchange unit 12 can heat the first liquid 81, for example, in spring, summer, autumn, and daytime, and the first liquid 81 warms the ground. Set when it cannot be done. In the third state, the first liquid 81 is heated in the water-air heat exchange unit 12, the second liquid 82 is heated in the heat pump device 13 using the temperature of the heated first liquid 81, and the second liquid 82 is heated. It is a state used for vaporizing the liquefied gas 142. In the third state, heat exchange by the geothermal heat exchanger 11 is not performed.

As shown in FIG. 4, in the third state, the first liquid 81 circulates between the water-air heat exchange unit 12 and the heat pump device 13. In the water-air heat exchange unit 12, heat exchange between the first liquid 81 and air is performed. In the present embodiment, when the third state is continued, the first liquid 81 is heated in the water-air heat exchange unit 12.

The first liquid 81 flows from the water-air heat exchange unit 12 to the heat pump device 13 via the second flow path 22 (see arrow H5). In the heat pump device 13, heat exchange between the first liquid 81 and the second liquid 82 is performed by the heat pump method, and the second liquid 82 is heated. Similar to the first state (see FIG. 1), the second liquid 82 circulates between the heat pump device 13 and the gas vaporization equipment 14 and is used for vaporizing the liquefied gas 142 in the liquefied gas container 141.

The first liquid 81 after being used for heat exchange in the heat pump device 13 flows to the water-air heat exchange unit 12 via the fifth flow path 25 (see arrow H3). The first liquid 81 is heated in the water-air heat exchange unit 12. Since the geothermal heat exchanger 11 is bypassed by the fifth flow path 25, the first liquid 81 does not flow through the geothermal heat exchanger 11. In the third state, as an example, the first liquid 81 changes from 5 degrees to 10 degrees in the water-air heat exchange unit 12 and changes from 10 degrees to 5 degrees in the heat pump device 13. Further, as an example, the second liquid 82 changes from 15 degrees to 25 degrees in the heat pump device 13, and changes from 25 degrees to 15 degrees in the gas vaporization facility 14.

A case where the gas vaporization system 1 is set to the fourth state will be described with reference to FIG. The fourth state is when the temperature is high and the first liquid 81 can be heated in the water-air heat exchange unit 12, such as in spring, summer, autumn, and daytime, and the temperature of the first liquid 81 is liquefied. It is set when it is not used for vaporizing the gas 142. The fourth state uses the heat of the first liquid 81 heated by the water-air heat exchange unit 12 to reduce the possibility of so-called "heat withering" in the ground, and is a geothermal heat exchanger. In No. 11, it is a state of warming the ground.

As shown in FIG. 5, in the fourth state, the first liquid 81 circulates between the geothermal heat exchanger 11 and the water-air heat exchange unit 12. In the water-air heat exchange unit 12, heat exchange between the first liquid 81 and air is performed. In the present embodiment, when the fourth state is continued, the first liquid 81 is heated in the water-air heat exchange unit 12.

The first liquid 81 flows from the water-air heat exchange unit 12 to the geothermal heat exchanger 11 via the sixth flow path 26 (see arrow H6). In the present embodiment, when the fourth state is continued, the first liquid 81 is cooled and the underground is warmed in the geothermal heat exchanger 11. The first liquid 81 flows from the geothermal heat exchanger 11 to the water-air heat exchange unit 12 via the first flow path 21 (see arrow H1). In the fourth state, as an example, the first liquid 81 changes from 12 degrees to 15 degrees in the water-air heat exchange unit 12 and changes from 15 degrees to 12 degrees in the geothermal heat exchanger 11.

A case where the gas vaporization system 1 is set to the fifth state (see FIG. 6) and a case where the gas vaporization system 1 is set to the sixth state (see FIG. 7) will be described with reference to FIGS. 6 and 7. The fifth and sixth states are when the temperature of the first liquid 81 heated in the water-air heat exchange unit 12 is equal to or higher than the vaporization temperature at which the liquefied gas 142 can be vaporized in the gas vaporization facility 14. , The first liquid 81 is supplied to the gas vaporization facility 14 to vaporize the liquefied gas 142. The vaporization temperature may be set any number of times as long as the temperature at which the liquefied gas 142 can be vaporized or higher. The vaporization temperature is stored in ROM 602. The vaporization temperature is, for example, 25 degrees.

In the fifth state, for example, in spring, summer, autumn, and daytime, the temperature is high, the first liquid 81 can be heated in the water-air heat exchange unit 12, and the liquefied gas 142 can be vaporized by the first liquid 81. It is set when the ground can be warmed by the first liquid 81. As shown in FIG. 6, in the fifth state, the first liquid 81 circulates through the geothermal heat exchanger 11, the water-air heat exchange unit 12, and the gas vaporization facility 14. The first liquid 81 flows from the geothermal heat exchanger 11 to the water-air heat exchange unit 12 via the first flow path 21 (see arrow H1). In the water-air heat exchange unit 12, heat exchange between the first liquid 81 and air is performed. In the present embodiment, when the fifth state is continued, the first liquid 81 is heated in the water-air heat exchange unit 12.

The first liquid 81 flows from the water-air heat exchange unit 12 to the gas vaporization facility 14 via the eighth flow path 28 (see arrow H7). The temperature of the first liquid 81 is used for vaporizing the liquefied gas 142 in the liquefied gas container 141. The first liquid 81 used for vaporizing the liquefied gas 142 flows to the geothermal heat exchanger 11 via the tenth flow path 30 and the flow paths 642, 643, 644 (see arrow H9). In the present embodiment, when the fifth state is continued, the first liquid 81 is cooled and the underground is warmed in the underground heat exchanger 11. This reduces the possibility of so-called "heat withering" in the ground. In the fifth state, as an example, the first liquid 81 changes from 13 degrees to 25 degrees in the water-air heat exchange unit 12, and changes from 25 degrees to 15 degrees in the gas vaporization facility 14, and is underground. The temperature changes from 15 degrees to 13 degrees in the heat exchanger 11.

In the sixth state, the temperature is high, for example, in spring, summer, autumn, and daytime, the first liquid 81 can be heated in the water-air heat exchange unit 12, and the liquefied gas 142 can be vaporized by the first liquid 81. It is set when the ground cannot be warmed by the first liquid 81. As shown in FIG. 7, in the sixth state, the first liquid 81 circulates between the water-air heat exchange unit 12 and the gas vaporization facility 14. In the water-air heat exchange unit 12, heat exchange between the first liquid 81 and air is performed. In the present embodiment, when the sixth state is continued, the first liquid 81 is heated in the water-air heat exchange unit 12.

The first liquid 81 flows from the water-air heat exchange unit 12 to the gas vaporization facility 14 via the eighth flow path 28 (see arrow H7). The temperature of the first liquid 81 is used for vaporizing the liquefied gas 142 in the liquefied gas container 141. The first liquid 81 used for vaporizing the liquefied gas 142 flows to the water-air heat exchange unit 12 via the tenth flow path 30, the flow path 642, 643, the flow path 651, and the flow path 612,613. (See arrow H11). In the sixth state, as an example, the first liquid 81 changes from 15 degrees to 25 degrees in the water-air heat exchange unit 12 and changes from 25 degrees to 15 degrees in the gas vaporization facility 14.

The main processing by the CPU 601 will be described with reference to FIGS. 8 to 10. When the power of the gas vaporization system 1 is turned on, the CPU 601 reads the main processing program from the ROM 602 and expands it into the RAM 603. The CPU 601 performs the main process according to the program of the main process.

In the main process, it is determined whether or not the vaporization start instruction is input via the operation unit 609 (see FIG. 2) (S11). The vaporization start instruction is an instruction to start vaporization of the liquefied gas 142. When the vaporization start instruction is not input (S11: NO), it is determined whether or not the instruction to be set in the fourth state (see FIG. 5) is input via the operation unit 609 (S12). When the instruction to set the fourth state is not input (S12: NO), it is determined whether or not the instruction to end the fourth state is input via the operation unit 609 (S13). If the instruction to end the fourth state is not input (S13: NO), the process returns to S11.

When the vaporization start instruction is input (S11: YES), the vaporization of the liquefied gas 142 is started (S14). In the present embodiment, as an example, it is assumed that the gas vaporization system 1 is set to the first state (see FIG. 1) in S14.

When set to the first state (see FIG. 1), the CPU 601 controls the first motorized valve 31 and first connects the geothermal heat exchanger 11 to the water-air heat exchange unit 12 via the first flow path 21. The liquid 81 is set to flow (see the arrow H1 in FIG. 1). Further, the CPU 601 controls the third motor valve 33 and the fourth motor valve 34 so that the first liquid 81 flows from the water-air heat exchange unit 12 to the heat pump device 13 via the second flow path 22. Set (see arrow H5 in FIG. 1). Further, the CPU 601 controls the second motor valve 32 and the fifth motor valve 35, and sets the first liquid 81 to flow from the heat pump device 13 to the geothermal heat exchanger 11 via the fourth flow path 24. (See arrow H4 in FIG. 1). The CPU 601 drives the heat pump device 13, the gas vaporization facility 14, the first pump 511, and the second pump 512, and starts vaporization of the liquefied gas 142 in the first state.

Next, the CPU 601 waits for a predetermined time (S15). This standby is performed to wait until the temperatures of the first liquid 81 and the second liquid 82 in each flow path stabilize. Although not particularly described below, when the state changes between the first state and the sixth state, a standby process is performed until the temperatures of the first liquid 81 and the second liquid 82 in each flow path stabilize. You may be broken.

Next, the first temperature is acquired based on the output of the first temperature sensor 521 (S16). Next, the second temperature, which is the temperature of the outside air, is acquired based on the output of the second temperature sensor 522 (S17). Next, it is determined whether or not the first temperature acquired in S16 is smaller than the second temperature acquired in S17 (S18).

When the first temperature is smaller than the second temperature (S18: YES), the first electric valve 31 is controlled, and the first liquid is transferred from the geothermal heat exchanger 11 to the water-air heat exchange unit 12 via the first flow path 21. 81 is flushed (see arrow H1 in FIG. 1) (S19). If the first liquid 81 is already flowing from the geothermal heat exchanger 11 to the water-air heat exchange unit 12 via the first flow path 21, this state is continued.

Then, as shown in FIG. 9, the third temperature is acquired based on the output of the third temperature sensor 523 (S31). Next, the fourth temperature is acquired based on the output of the first temperature sensor 521 (S32). It is determined whether or not the third temperature acquired in S31 is larger than the fourth temperature acquired in S32 (S33).

When the third temperature is higher than the fourth temperature (S33: YES), the second motorized valve 32 is controlled, and the first liquid 81 is flowed from the heat pump device 13 to the geothermal heat exchanger 11 via the fourth flow path 24. The state is maintained (S34). Next, the fifth temperature is acquired based on the output of the fifth temperature sensor 525 (S36). Next, it is determined whether or not the fifth temperature acquired in S36 is smaller than the vaporization temperature (S37).

When the fifth temperature is smaller than the vaporization temperature (S37: YES), the fourth electric valve 34 is controlled, and the first liquid 81 is transferred from the water-air heat exchange unit 12 to the heat pump device 13 via the second flow path 22. The second liquid 82 is flowed (see arrow H5 in FIG. 1), and the second liquid 82 is flowed from the heat pump device 13 to the gas vaporization facility 14 via the seventh flow path 27 (see arrow H10 in FIG. 1) (S38). In this case, heat is exchanged between the first liquid 81 and the second liquid 82 in the heat pump device 13, and the second liquid 82 is heated. The heated second liquid 82 is flowed from the heat pump device 13 to the gas vaporization facility 14 via the seventh flow path 27, and the liquefied gas 142 is vaporized in the gas vaporization facility 14. The first liquid 81 has already been flowed from the water-air heat exchange unit 12 to the heat pump device 13 via the second flow path 22, and the first liquid 81 has already flowed from the heat pump device 13 to the gas vaporization facility 14 via the seventh flow path 27. (Ii) When the liquid 82 is flowing, the state is continued.

Next, the fifth motorized valve 35 is controlled, and the second liquid 82 is flowed from the gas vaporization facility 14 to the heat pump device 13 via the ninth flow path 29 (see arrow H8 in FIG. 1) (S39). The fifth motorized valve 35 is set so that the first liquid 81 flows from the flow path 641 to the flow path 642, and the second liquid 82 does not flow from the tenth flow path 30 to the flow path 642. Set. If the second liquid 82 is already flowing from the gas vaporization facility 14 to the heat pump device 13 via the ninth flow path 29, this state is continued.

Next, the heat pump device 13 is driven (S40). If the heat pump device 13 has already been driven, the drive of the heat pump device 13 is continued.

Next, as shown in FIG. 10, it is determined whether or not the first liquid 81 is flowing through the geothermal heat exchanger 11 (S51). In the first state (see FIG. 1), the second state (see FIG. 3), the fourth state (see FIG. 5), and the fifth state (see FIG. 6), the first liquid is stored in the geothermal heat exchanger 11. 81 is flowing. When the first liquid 81 is flowing through the geothermal heat exchanger 11 (S51: YES), it is determined whether or not the vaporization stop instruction is input via the operation unit 609 (S55). The vaporization stop instruction is an instruction to stop the operation of vaporizing the liquefied gas 142. When the vaporization stop instruction is not input (S55: NO), the process returns to S16 in FIG. When the above processing is executed, the first state is maintained.

Next, a case where the first state (see FIG. 1) can be switched to the second state (see FIG. 3) will be described as an example. When the temperature is low, such as in winter and at night, the underground temperature becomes higher than the air temperature, and the first temperature becomes higher than the second temperature. In this case, in S18, it is determined that the first temperature is not smaller than the second temperature (S18: NO), the first electric valve 31 is controlled, and the heat pump from the geothermal heat exchanger 11 via the third flow path 23. The first liquid 81 is flowed through the device 13 (see arrow H2 in FIG. 3) (S20). As a result, the first state (see FIG. 1) changes to the second state (see FIG. 3). That is, the first liquid 81 is not supplied to the water-air heat exchange unit 12. If the first liquid 81 is already flowing from the geothermal heat exchanger 11 to the heat pump device 13 via the third flow path 23, this state is continued.

The process then proceeds to S55 (see FIG. 10). In the case of the second state, when the first temperature becomes smaller than the second temperature (S18: YES), the first state (see FIG. 1) is set (S19).

Next, a case where the first state (see FIG. 1) can be switched to the third state (see FIG. 4) will be described. When the third temperature becomes equal to or lower than the fourth temperature, the underground heat exchanger 11 cannot heat the ground. Therefore, the underground heat exchanger 11 is set to the third state in which the first liquid 81 is not circulated.

When the third temperature becomes equal to or lower than the fourth temperature, it is determined in S33 that the third temperature is not larger than the fourth temperature (S33: NO), the second electric valve 32 is controlled, and the heat pump is passed through the fifth flow path 25. The first liquid 81 is flowed from the device 13 to the water-air heat exchange unit 12 (see arrow H3 in FIG. 4) (S35). As a result, the first state (see FIG. 1) can be switched to the third state (see FIG. 4). Therefore, the first liquid 81 is not supplied to the geothermal heat exchanger 11. If the first liquid 81 is already flowing from the heat pump device 13 to the water-air heat exchange unit 12 via the fifth flow path 25, this state is continued.

Then, the process proceeds to S36. When the third state is set, in S51 (see FIG. 10), it is determined that the first liquid 81 is not flowing through the geothermal heat exchanger 11 (S51: NO), and the ground is passed through the operation unit 609. It is determined whether or not an instruction to flow the first liquid 81 is input to the medium heat exchanger 11 (S52). When the instruction to flow the first liquid 81 is not input to the geothermal heat exchanger 11 (S52: NO), it is determined whether or not the vaporization stop instruction is input via the operation unit 609 (S53). If the vaporization stop instruction is not input (S53: NO), the process returns to S36 (see FIG. 9). As a result, the third state (see FIG. 4) is maintained.

When an instruction to flow the first liquid 81 is input to the geothermal heat exchanger 11 (S52: YES), the second motor valve 32 is controlled and the first liquid 81 is flowed to the geothermal heat exchanger 11 (FIG. (See arrow H4 in 1) (S54). As a result, the third state (see FIG. 4) can be switched to the first state (see FIG. 1). Then, the process proceeds to S55.

A case of switching from the first state (see FIG. 1) to the fifth state (see FIG. 6) and a case of switching from the third state (see FIG. 4) to the sixth state (see FIG. 7) will be described. When the fifth temperature is equal to or higher than the vaporization temperature, it is determined in S37 that the fifth temperature is not smaller than the vaporization temperature (S37: NO), the fourth electric valve 34 is controlled, and water is passed through the eighth flow path 28. -The first liquid 81 is flowed from the air heat exchange unit 12 to the gas vaporization facility 14 (see arrow H7 in FIGS. 6 and 7) (S41). If the first liquid 81 is already flowing from the water-air heat exchange unit 12 to the gas vaporization facility 14 via the eighth flow path 28, this state is continued.

Next, the fifth motorized valve 35 is controlled, and the first liquid 81 is flowed from the gas vaporization facility 14 to the flow path 642 via the tenth flow path 30 (see arrow H9 in FIG. 6 and arrow H11 in FIG. 7). (S42). If the first liquid 81 is already flowing from the gas vaporization facility 14 to the flow path 642 via the tenth flow path 30, this state is continued.

Then, the heat pump device 13 is stopped (S43). If the heat pump device 13 has already been stopped, this state is continued. If it is the first state (see FIG. 1), it is switched to the fifth state (see FIG. 6) by S41 and S42. Further, in the case of the third state (see FIG. 4), the sixth state (see FIG. 7) is switched by S41 and S42. That is, in S42, the fifth motorized valve 35 is controlled, and the first liquid 81 is flowed from the gas vaporization facility 14 to the geothermal heat exchanger 11 or the water-air heat exchange unit 12 via the tenth flow path 30. Is done. Then, the process proceeds to S51 of FIG.

In the case of the fifth state (see FIG. 6) or the sixth state (see FIG. 7), when the fifth temperature becomes smaller than the vaporization temperature (S37: YES), the processes S38 to S40 are executed. As a result, the fifth state (see FIG. 6) can be switched to the first state (see FIG. 1). Further, the sixth state (see FIG. 7) can be switched to the third state (see FIG. 4).

When the vaporization stop instruction is input in S55 (S55: YES), the vaporization of the liquefied gas 142 is stopped (S56). Further, in S53, when the vaporization stop instruction is input (S53: YES), the vaporization of the liquefied gas 142 is stopped (S56). In S56, for example, the driving of the first pump 511, the second pump 512, the heat pump device 13, and the gas vaporization facility 14 is stopped. The process then returns to S11 (see FIG. 8).

When the instruction to set to the fourth state (see FIG. 5) is input (S12: YES) in the state where the vaporization of the liquefied gas 142 is stopped, at least the third electric valve 33 is controlled and the sixth flow path is controlled. The first liquid 81 is set to flow from the water-air heat exchange unit 12 to the geothermal heat exchanger 11 via 26 (see arrow H6 in FIG. 5) (S21). In the present embodiment, the second motorized valve 32 is also controlled, and the first liquid 81 is set to flow from the flow path 643 to the flow path 644 (S21).

Next, the first motorized valve 31 is controlled, and the first liquid 81 is set to flow from the geothermal heat exchanger 11 to the water-air heat exchange unit 12 via the first flow path 21 (arrow in FIG. 5). See H1) (S22). Next, the first pump 511 is driven and the first liquid 81 is flowed (S23). By the processing of S21 to S23, the gas vaporization system 1 is set to the fourth state (see FIG. 5). Then, the process returns to S11.

When the instruction to end the fourth state is input (S13: YES), the drive of the first pump 511 is stopped, and the state in which the first liquid 81 is flown in the fourth state is stopped (S24). Then, the process returns to S11.

As described above, the processing in the present embodiment is executed. In the present embodiment, when the first liquid 81 is flown from the geothermal heat exchanger 11 to the water-air heat exchange unit 12 through the first flow path 21 by the first electric valve 31 (see the arrow H1 in FIG. 1). , The case where the first liquid 81 is flown from the geothermal heat exchanger 11 to the heat pump device 13 via the third flow path 23 (see the arrow H2 in FIG. 3) is switched. Therefore, for example, when the temperature is low and the first liquid 81 cannot be heated in the water-air heat exchange unit 12, such as in winter and at night, the first liquid 81 is heated and heated by the geothermal heat exchanger 11. The first liquid 81 can flow from the geothermal heat exchanger 11 to the heat pump device 13 via the third flow path 23 (see FIG. 3). Then, the temperature of the first liquid 81 can be used in the heat pump device 13 to heat the second liquid 82. Then, the heated second liquid 82 can be passed through the gas vaporization facility 14 and used for vaporizing the liquefied gas 142. Further, when the temperature is high and the first liquid 81 can be heated in the water-air heat exchange unit 12, for example, in spring, summer, autumn, and daytime, the heat is exchanged in the geothermal heat exchanger 11. One liquid 81 can be passed through the water-air heat exchange unit 12 through the first flow path 21 into the first liquid 81, and the first liquid 81 can be heated in the water-air heat exchange unit 12 (see FIG. 1). .. Then, the temperature of the first liquid 81 can be used in the heat pump device 13 to heat the second liquid 82. Then, the heated second liquid 82 can be passed through the gas vaporization facility 14 and used for vaporizing the liquefied gas 142. In this way, the gas vaporization system 1 can vaporize the liquefied gas throughout the year by using the heat pump method. Therefore, a heat pump system can be used for the gas vaporization system 1. Further, by using the heat pump method, it is possible to reduce the cost as compared with the case where the fuel is burned in the boiler device to heat the second liquid 82, for example.

Further, the first temperature is acquired (S16), and the second temperature is acquired (S17). When the first temperature is smaller than the second temperature (S18: YES), the first motorized valve 31 is controlled, and the first liquid is transferred from the geothermal heat exchanger 11 to the water-air heat exchange unit 12 via the first flow path 21. 81 is shed (S19). When the first temperature is smaller than the second temperature, which is the temperature of the outside air, it is possible to heat the first liquid 81 in the water-air heat exchange unit 12. Therefore, the first liquid 81 is passed through the water-air heat exchange unit 12 to heat the first liquid 81. On the other hand, when the first temperature is not smaller than the second temperature (S18: NO), the first liquid 81 is flowed from the geothermal heat exchanger 11 to the heat pump device 13 via the third flow path 23 (S20). When the first temperature is equal to or higher than the second temperature, which is the temperature of the outside air, it is difficult to heat the first liquid 81 in the water-air heat exchange unit 12. Therefore, the first liquid 81 is not flowed through the water-air heat exchange unit 12, but the first liquid 81 is directly flowed from the geothermal heat exchanger 11 to the heat pump device 13. In this way, when the first liquid 81 is flowed from the geothermal heat exchanger 11 to the water-air heat exchange unit 12 via the first flow path 21 due to the relationship between the first temperature and the second temperature (see FIG. 1). ) And the case where the first liquid 81 is flowed from the geothermal heat exchanger 11 to the heat pump device 13 via the third flow path 23 (see FIG. 3) is automatically switched. Therefore, it is not necessary for the user to manually switch the flow path, and the convenience of the user is improved.

Further, the fourth flow path 24 is a flow path through which the first liquid 81 after being used for heat exchange in the heat pump device 13 flows, and is a flow path connecting the heat pump device 13 and the geothermal heat exchanger 11. .. By providing the fourth flow path 24, the first liquid 81 after being used for heat exchange in the heat pump device 13 can flow to the geothermal heat exchanger 11. Therefore, for example, when the temperature in the ground is higher than that of the first liquid 81, the first liquid 81 can be flown from the heat pump device 13 to the geothermal heat exchanger 11 to heat the first liquid 81. Further, for example, when the temperature in the ground is lower than that of the first liquid 81, the first liquid 81 is flowed from the heat pump device 13 to the geothermal heat exchanger 11 to warm the ground in the geothermal heat exchanger 11 to warm the ground. It is possible to reduce the possibility that the inside becomes so-called "heat withering".

Further, the fifth flow path 25 is a flow path through which the first liquid 81 after being used for heat exchange in the heat pump device 13 flows, and is a flow path connecting the heat pump device 13 and the water-air heat exchange unit 12. is there. Then, when the second electric valve 32 causes the first liquid 81 to flow from the heat pump device 13 to the geothermal heat exchanger 11 via the fourth flow path 24 (see FIG. 1), the second electric valve 32 passes through the fifth flow path 25. The case where the first liquid 81 is flowed from the heat pump device 13 to the water-air heat exchange unit 12 is switched (see FIG. 4). That is, it is possible to switch between the case where the first liquid 81 flows through the geothermal heat exchanger 11 and the case where the first liquid 81 does not flow. Therefore, for example, the first liquid 81 is supplied to the underground heat exchanger 11 only when the temperature at which the ground can be heated remains in the first liquid 81 flowing out from the heat pump device 13 to the fourth flow path 24. It can be flushed to reduce the possibility of so-called "heat withering" in the ground.

When the third temperature is higher than the fourth temperature (S33: YES), the second motorized valve 32 is controlled, and the first liquid 81 is transmitted from the heat pump device 13 to the geothermal heat exchanger 11 via the fourth flow path 24. Is washed away (S34). When the third temperature is not higher than the fourth temperature (S33: NO), the second motorized valve 32 is controlled, and the first liquid 81 is transferred from the heat pump device 13 to the water-air heat exchange unit 12 via the fifth flow path 25. Is washed away (S35). When the third temperature is higher than the fourth temperature, the first liquid 81 that has flowed into the geothermal heat exchanger 11 from the heat pump device 13 via the fourth flow path 24 is cooled in the geothermal heat exchanger 11 and is the third. It is in a state of flowing out to one flow path 21. That is, the temperature of the first liquid 81 is used in the underground heat exchanger 11, and the underground is warmed. When the underground is warmed in the geothermal heat exchanger 11, the first liquid 81 is flowed from the heat pump device 13 to the geothermal heat exchanger 11 via the fourth flow path 24 (S34). It is possible to reduce the possibility that the inside will be in a so-called "heat withered" state. On the other hand, when the third temperature is equal to or lower than the fourth temperature, the first liquid 81 that has flowed into the geothermal heat exchanger 11 from the heat pump device 13 via the fourth flow path 24 is heated in the geothermal heat exchanger 11. It is in a state of being discharged to the first flow path 21. Therefore, in the underground heat exchanger 11, the first liquid 81 is in a state of taking heat from the ground. When the first liquid 81 is taking heat from the ground, the first liquid 81 is flowed from the heat pump device 13 to the water-air heat exchange unit 12 via the fifth flow path 25 (S35), so that it is underground. The first liquid 81 does not flow through the heat exchanger 11. Therefore, it is possible to reduce the possibility that the underground heat exchanger 11 is deprived of the heat in the ground and the ground is in a so-called "heat withering" state.

Further, the sixth flow path 26 is a flow path through which the first liquid 81 after heat exchange in the water-air heat exchange unit 12 flows, and the water-air heat exchange unit 12 and the geothermal heat exchanger 11 It is a flow path that connects the two. The third electric valve 33 causes the first liquid 81 to flow from the water-air heat exchange unit 12 to the heat pump device 13 via the second flow path 22 (see FIG. 1), and the water through the sixth flow path 26. -Switch between the case where the first liquid 81 flows from the air heat exchange unit 12 to the geothermal heat exchanger 11 (see FIG. 5). Therefore, when the first liquid 81 is flowed from the water-air heat exchange unit 12 to the heat pump device 13 via the second flow path 22, the temperature of the first liquid 81 heated in the water-air heat exchange unit 12 is used. Therefore, the second liquid 82 can be heated in the heat pump device 13. Further, when the first liquid 81 is flowed from the water-air heat exchange unit 12 to the geothermal heat exchanger 11, the temperature of the first liquid 81 heated in the water-air heat exchange unit 12 is used for geothermal heat exchange. The ground can be warmed in the vessel 11. Therefore, the possibility that the underground becomes so-called "heat withering" can be reduced.

Further, when the vaporization of the liquefied gas 142 by the gas vaporization facility 14 is stopped, the third electric valve 33 is controlled, and the water-air heat exchange unit 12 passes through the sixth flow path 26 to the geothermal heat exchanger. The first liquid 81 is flowed through 11 (see FIG. 5) (S21). Therefore, when the vaporization of the liquefied gas 142 by the gas vaporization facility 14 is stopped, the temperature of the first liquid 81 heated in the water-air heat exchange unit 12 is used to ground in the geothermal heat exchanger 11. You can warm the inside. Therefore, the possibility that the underground becomes so-called "heat withering" can be reduced.

Further, the fourth electric valve 34 causes the first liquid 81 to flow from the water-air heat exchange unit 12 to the heat pump device 13 via the second flow path 22, and gas vaporizes from the heat pump device 13 via the seventh flow path 27. A case where the second liquid 82 is flowed through the equipment 14 (see FIGS. 1 and 4) and a case where the first liquid 81 is flown from the water-air heat exchange unit 12 to the gas vaporization equipment 14 via the eighth flow path 28 (FIG. 6 and FIG. 7) are switched. Therefore, when the first liquid 81 is flowed from the water-air heat exchange unit 12 to the gas vaporization facility 14 via the eighth flow path 28, the first liquid 81 heated in the water-air heat exchange unit 12 is used. Then, the liquefied gas 142 can be vaporized. Therefore, it is not necessary to drive the heat pump device 13, and the operating cost of the gas vaporization system 1 can be reduced.

When the fifth temperature is smaller than the vaporization temperature (S37: YES), the fourth electric valve 34 is controlled, and the first liquid 81 is transmitted from the water-air heat exchange unit 12 to the heat pump device 13 via the second flow path 22. The second liquid 82 is flowed from the heat pump device 13 to the gas vaporization facility 14 via the seventh flow path 27 (see FIGS. 1 and 4) (S38). When the fifth temperature is not smaller than the vaporization temperature (S37: NO), the fourth motorized valve 34 is controlled, and the first liquid 81 is transmitted from the water-air heat exchange unit 12 to the gas vaporization facility 14 via the eighth flow path 28. (See FIGS. 6 and 7) (S41). That is, when the fifth temperature is equal to or higher than the vaporization temperature, the first liquid 81 is automatically flowed to the gas vaporization facility 14 and used for vaporizing the liquefied gas 142. Therefore, it is not necessary for the user to manually switch the flow path, and the convenience of the user is improved.

In the above embodiment, the geothermal heat exchanger 11 is an example of the "geothermal heat exchanger" of the present invention. The water-air heat exchange unit 12 is an example of the "air heat exchange unit" of the present invention. The heat pump device 13 is an example of the "heat pump unit" of the present invention. The gas vaporization facility 14 is an example of the "gas vaporization unit" of the present invention. The first motorized valve 31 is an example of the "first switching unit" of the present invention. The CPU 601 that performs the processing of S16 is an example of the "first temperature acquisition means" of the present invention. The CPU 601 that performs the process of S17 is an example of the "second temperature acquisition means" of the present invention. The CPU 601 that performs the process of S18 is an example of the "first temperature determining means" of the present invention. The CPU 601 that performs the processing of S19 is an example of the "first control means" of the present invention. The CPU 601 that performs the processing of S20 is an example of the "second control means" of the present invention.

The second motorized valve 32 is an example of the "second switching unit" of the present invention. The CPU 601 that performs the processing of S31 is an example of the "third temperature acquisition means" of the present invention. The CPU 601 that performs the processing of S32 is an example of the "fourth temperature acquisition means" of the present invention. The CPU 601 that performs the processing of S33 is an example of the "second temperature determining means" of the present invention. The CPU 601 that performs the processing of S34 is an example of the "third control means" of the present invention. The CPU 601 that performs the processing of S35 is an example of the "fourth control means" of the present invention. The third motorized valve 33 is an example of the "third switching unit" of the present invention. The CPU 601 that performs the processing of S21 is an example of the "fifth control means" of the present invention. The fourth motorized valve 34 is an example of the "fourth switching unit" of the present invention. The CPU 601 that performs the processing of S36 is an example of the "fifth temperature acquisition means" of the present invention. The CPU 601 that performs the processing of S38 is an example of the "sixth control means" of the present invention. The CPU 601 that performs the processing of S41 is an example of the "seventh control means" of the present invention.

The present invention is not limited to the above embodiment, and various modifications can be made. For example, the flow paths of the first motorized valve 31, the second motorized valve 32, the third motorized valve 33, the fourth motorized valve 34, and the fifth motorized valve 35 were switched by being controlled by the CPU 601. Not limited to this. For example, the first electric valve 31, the second electric valve 32, the third electric valve 33, the fourth electric valve 34, and the fifth electric valve 35 are not electric valves, but members whose flow paths can be manually switched by the user. It may be. Further, the timing at which the first motor-operated valve 31, the second motor-operated valve 32, the third motor-operated valve 33, the fourth motor-operated valve 34, and the fifth motor-operated valve 35 switch the flow path is determined by the user using the operation unit 609 to switch the flow path. It may be the timing when the switching instruction is input.

Further, the number of each device and the connection method of the flow path are not limited to the above-described embodiment. For example, the geothermal heat exchanger 11 includes two U tubes 111 and 112 buried in the ground, but the number of U tubes may be one or three or more. Further, a plurality of U tubes may be connected in series or may be connected in parallel. Further, the geothermal heat exchanger 11 does not have to be a U tube. Similarly, the number of other devices (for example, water-air heat exchange unit 12, heat pump device 13, etc.), the flow path connection method, and the type of device are not limited.

Further, although the flow path is switched by the second motor valve 32, the third motor valve 33, and the fourth motor valve 34, the flow path may not be switched. In this case, it is not necessary to execute the process of switching the flow path by the second solenoid valve 32, the third solenoid valve 33, and the fourth solenoid valve 34. Further, the processes of S16, S17, S31, S32, and S36 may not be executed, and the first temperature, the second temperature, the third temperature, the fourth temperature, and the fifth temperature may not be acquired. The fourth flow path 24, the fifth flow path 25, the sixth flow path 26, the eighth flow path 28, the ninth flow path 29, and the tenth flow path 30 may not be provided.

Further, when an instruction to flow the first liquid 81 was input to the geothermal heat exchanger 11 (S52: YES), the first liquid 81 was flowed to the geothermal heat exchanger 11 (S54). Not limited to. For example, the first liquid 81 may be flowed through the geothermal heat exchanger 11 at predetermined time intervals (for example, every hour). Further, the first liquid 81 may be flowed through the geothermal heat exchanger 11 at a predetermined time (for example, 3:00 pm).

Further, when the ground can be warmed by the first liquid 81, the first liquid 81 is passed through the underground heat exchanger 11, and when the ground cannot be warmed by the first liquid 81, the geothermal heat exchanger 11 is used. Although it has been described as an example that the first liquid 81 does not flow into the water (see S33, S34, and S35), the present invention is not limited to this. For example, even in a state where the ground can be warmed by the first liquid 81, the first liquid 81 does not have to flow through the underground heat exchanger 11. Further, even when the ground cannot be heated by the first liquid 81, the first liquid 81 may flow through the underground heat exchanger 11. In this case, the first liquid 81 can be heated in the geothermal heat exchanger 11. Therefore, for example, in the first state (see FIG. 1), the first liquid 81 is heated in the geothermal heat exchanger 11 and the first liquid 81 is further heated in the water-air heat exchange unit 12. One liquid 81 can be supplied to the heat pump device 13. Further, it is not necessary to switch between the case where the first liquid 81 is flowed through the geothermal heat exchanger 11 and the case where the first liquid 81 is not flown, and the first liquid 81 may be constantly flowed through the geothermal heat exchanger 11.

1 Gas vaporization system 11 Underground heat exchanger 12 Air heat exchange unit 13 Heat pump device 14 Gas vaporization equipment 21 First flow path 22 Second flow path 23 Third flow path 24 Fourth flow path 25 Fifth flow path 26 Sixth flow Road 27 7th flow path 28 8th flow path 29 9th flow path 30 10th flow path 31 1st electric valve 32 2nd electric valve 33 3rd electric valve 34 4th electric valve 35 5th electric valve 81 1st liquid 82 Second liquid 142 Liquefied gas 511 First pump 512 Second pump 601 CPU

Claims (9)

An underground heat exchange unit that exchanges heat between the first liquid and geothermal heat,
An air heat exchange unit that exchanges heat between the first liquid and air,
A heat pump unit that exchanges heat between the first liquid and the second liquid by a heat pump method,
A gas vaporization unit that vaporizes the liquefied gas by heat exchange between the second liquid and the liquefied gas that have undergone heat exchange in the heat pump unit.
A flow path through which the first liquid flows, and a first flow path connecting the geothermal heat exchange section and the air heat exchange section.
A flow path through which the first liquid flows, and a second flow path connecting the air heat exchange section and the heat pump section.
A flow path through which the first liquid flows, and a third flow path connecting the geothermal heat exchange section and the heat pump section.
The first liquid flows from the geothermal heat exchange section to the air heat exchange section via the first flow path, and the first liquid flows from the geothermal heat exchange section to the heat pump section via the third flow path. A gas vaporization system characterized by having a first switching unit that switches between the case of flowing a liquid and the case of flowing a liquid. A first temperature acquisition means for acquiring the first temperature, which is the temperature of the first liquid flowing through the first flow path or the third flow path,
A second temperature acquisition means for acquiring the second temperature, which is the temperature of the outside air,
A first temperature determining means for determining whether or not the first temperature acquired by the first temperature acquiring means is smaller than the second temperature acquired by the second temperature acquiring means.
When the first temperature determination means determines that the first temperature is smaller than the second temperature, the first switching unit is controlled to control the first switching unit from the underground heat exchange unit via the first flow path. A first control means for flowing the first liquid through the air heat exchange unit,
When the first temperature determining means determines that the first temperature is not smaller than the second temperature, the first switching unit is controlled to control the first switching unit and the geothermal heat exchange unit via the third flow path. The gas vaporization system according to claim 1, wherein the heat pump unit is provided with a second control means for flowing the first liquid. A claim characterized in that a flow path through which the first liquid flows after being used for heat exchange in the heat pump unit is provided with a fourth flow path connecting the heat pump unit and the geothermal heat exchange unit. Item 2. The gas vaporization system according to Item 1 or 2. A flow path through which the first liquid flows after being used for heat exchange in the heat pump unit, and a fifth flow path connecting the heat pump unit and the air heat exchange unit.
The first liquid flows from the heat pump section to the geothermal heat exchange section via the fourth flow path, and the first liquid flows from the heat pump section to the air heat exchange section via the fifth flow path. The gas vaporization system according to claim 3, further comprising a second switching unit for switching between the case of flowing the gas and the case of flowing the gas. A third temperature acquisition means for acquiring a third temperature, which is the temperature of the first liquid flowing through the fourth flow path,
A fourth temperature acquisition means for acquiring a fourth temperature, which is the temperature of the first liquid flowing through the first flow path, while the first liquid is flowing through the geothermal heat exchange unit.
A second temperature determining means for determining whether or not the third temperature acquired by the third temperature acquiring means is larger than the fourth temperature acquired by the fourth temperature acquiring means.
When the third temperature is determined to be higher than the fourth temperature by the second temperature determining means, the second switching unit is controlled to control the second switching unit from the heat pump unit to the ground via the fourth flow path. A third control means for flowing the first liquid through the heat exchange unit,
When the second temperature determining means determines that the third temperature is not larger than the fourth temperature, the second switching unit is controlled to control the air from the heat pump unit via the fifth flow path. The gas vaporization system according to claim 4, wherein the heat exchange unit is provided with a fourth control means for flowing the first liquid. A flow path through which the first liquid flows after heat exchange in the air heat exchange section, and a sixth flow path connecting the air heat exchange section and the geothermal heat exchange section.
The first liquid flows from the air heat exchange unit to the heat pump unit via the second flow path, and the first liquid flows from the air heat exchange unit to the geothermal heat exchange unit via the sixth flow path. The gas vaporization system according to any one of claims 3 to 5, further comprising a third switching unit for switching between a case where a liquid is flown and a case where a liquid is flown. When the vaporization of the liquefied gas by the gas vaporizing unit is stopped, the third switching unit is controlled to move from the air heat exchange unit to the geothermal heat exchange unit via the sixth flow path. The gas vaporization system according to claim 6, further comprising a fifth control means for flowing the first liquid. A seventh flow path through which the second liquid flows, which is a flow path connecting the heat pump section and the gas vaporization section,
An eighth flow path through which the first liquid flows, which connects the air heat exchange section and the gas vaporization section.
A case where the first liquid is flowed from the air heat exchange section to the heat pump section via the second flow path, and the second liquid is flown from the heat pump section to the gas vaporization section via the seventh flow path. 1. Any of claims 1 to 7, further comprising a fourth switching unit that switches between a case where the first liquid is flowed from the air heat exchange unit to the gas vaporization unit via the eighth flow path. The gas vaporization system described in Crab. A fifth temperature acquisition means for acquiring a fifth temperature, which is the temperature of the first liquid flowing through the second flow path or the eighth flow path, and
A third temperature determining means for determining whether or not the fifth temperature acquired by the fifth temperature acquiring means is smaller than the vaporization temperature which is a temperature at which the liquefied gas can be vaporized by the gas vaporizing unit.
When the fifth temperature is determined to be smaller than the vaporization temperature by the third temperature determining means, the fourth switching unit is controlled to control the fourth switching unit from the air heat exchange unit to the heat pump via the second flow path. A sixth control means for flowing the first liquid through the unit and flowing the second liquid from the heat pump unit to the gas vaporization unit via the seventh flow path.
When the fifth temperature is determined by the third temperature determining means to be not smaller than the vaporization temperature, the fourth switching unit is controlled to control the fourth switching unit from the air heat exchange unit via the eighth flow path. The gas vaporization system according to claim 8, wherein the gas vaporization unit is provided with a seventh control means for flowing the first liquid.

Images