KR100563180B1 - Heat pump hot water supply device - Google Patents

Abstract

An object of the present invention is to eliminate hot water depletion and to improve bath water reheating ability.

A heat pump circuit 1 for heating the water supply via the first heat exchanger 15, a water supply pipe communicating the water supply source 40 with a water supply port of the first heat exchanger 15, and the first heat exchanger 15. The hot water pipe communicating with the hot water outlet of the hot water supply port 53 and the water supply pipe and the hot water pipe were bypassed through the second heat exchanger 75 to heat the hot water heated in the first heat exchanger 15 by a pump. Bypass the heating circuit leading to the heat exchanger (75), the reheating circuit for heating the tub water extracted from the bath (65) in the second heat exchanger (75) to return to the bath (65), and The first flow rate control valve 85 for adjusting the amount of hot water guided to the second heat exchanger 75 and the second flow rate control valve for adjusting the amount of hot water guided to the hot water supply port 53 without bypassing the hot water supply pipe 53. By providing 41, bath water can be reheated and direct hot water can be performed simultaneously.

Heat exchanger, flow control valve, heat pump circuit, tank circulation pump

Description

Heat Pump Hot Water Supply Unit {HEAT PUMP HOT WATER SUPPLY DEVICE}

1 is a configuration diagram showing an example of a heat pump hot water supply device according to the present embodiment.

2 is a flowchart showing an operation during hot water supply of the hot water supply apparatus according to the present embodiment.

Fig. 3 is a flowchart showing hot water filling operation in automatic bath water operation of a hot water supply device according to the present embodiment.

4 is a flowchart illustrating a bath water reheating operation in automatic bath water operation of a hot water supply device according to the present embodiment.

5 is a configuration diagram showing an example of another heat pump hot water supply device according to the present embodiment.

<Explanation of symbols for the main parts of the drawings>

1: heat pump refrigerant circuit

3: hot water circuit

5: driving control means

15: water refrigerant heat exchanger

21: water storage tank

27: Tank Circulation Pump

40: water outlet

41, 85: flow control valve

53: hot water spout

65: bathtub

75: bath water heat exchanger

161: 3-way valve for flow adjustment

The present invention relates to a heat pump hot water supply device having a bath water reheating function.

In general, a hot water supply device is operated to operate a heating device at night with low electric power and to store hot water in a water storage tank so as to procure as much as it is used during the day. However, according to such a hot water supply apparatus, when heating a cold bath water, for example, it has only one-sided foot bath function to a low temperature water tank, and an appropriate response cannot be taken.

Thus, as a hot water supply device having a reheat function of the bath water, the low-temperature water extracted from the bottom of the water storage tank is heated by a heater such as a heater to be stored in the upper portion of the water storage tank, while the flow path of the hot water heated by the heater to the bath water heater side. A method of switching and heating a bath water flowing into a bath water heater has been proposed (see Patent Document 1).

According to this, since the heat energy of the hot water of a low temperature tank is not used as a heat source of bath water reheating, tapping temperature does not change even if tapping and reheating are performed simultaneously.

[Patent Document 1]

Japanese Patent Laid-Open No. 9-89369 (4 pages, Fig. 1)

However, the hot water supply apparatus of patent document 1 has no consideration about the heating capability at the time of warming again. Here, in terms of the heating capacity of the heater, in the case of an electric water heater, a small-capacity electric heater of, for example, about 2 to 5 kPa is used. In particular, in a low temperature hot water supply device, a heating capacity for directly heating and supplying hot water is provided. I'm not doing it.

Therefore, although the heating capacity enough to agitate is enough, for example, when heating a cooled tub water again, the heating capacity is insufficient, and the boiling time becomes long and the utility becomes low. In addition, since reheating is usually performed at a time when the electric charge is high, the cost advantage of high electricity charge and storage at night is reduced.

On the other hand, in the case of a low-temperature storage type that stores a predetermined amount of hot water, for example, when the amount of hot water is increased in the winter when the outside temperature is low, the amount of hot water becomes insufficient and once the hot water is depleted, until the predetermined amount of hot water is boiled again. It takes a lot of time. Therefore, it is considered to increase the capacity of the storage tank, but the entire hot water supply apparatus is enlarged to increase the installation space, and the strength of the installation floor surface is required.                         

An object of the present invention is to eliminate hot water depletion and to improve bath water reheating ability.

In order to solve the above problems, the hot water supply apparatus of the present invention is a heat pump circuit for heating the water supply via the first heat exchanger, a water supply pipe communicating the water supply source and the water supply port of the first heat exchanger, and the hot water outlet of the first heat exchanger And a hot water pipe communicating with the hot water supply port, a heating circuit for bypassing the water supply pipe and the hot water pipe through the second heat exchanger, and directing the hot water heated in the first heat exchanger to the second heat exchanger by a pump, and a tub extracted from the bathtub. A reheating circuit for heating the water in the second heat exchanger to return to the bath, a first flow control valve for bypassing the hot water supply pipe to adjust the amount of hot water introduced to the second heat exchanger, and a hot water supply pipe without bypassing the hot water supply pipe. It is characterized by including the 2nd flow volume adjustment valve which adjusts the amount of hot water guide | induced to a sphere.

According to the above configuration, hot water heated in the first heat exchanger can be directly heated by inducing heat exchange by inducing water supplied from the water supply port to the first heat exchanger heated in the heat pump circuit, and tapping the heated hot water from the hot water supply port. A portion of can be bypassed to direct to the second heat exchanger and reheated by heat exchange with the cold bath water. In this case, the tapping amount from the hot water supply port and the reheating capacity can be adjusted by the opening degrees of the first flow regulating valve and the second flow regulating valve, respectively.

In addition, since the heating capacity of the heat pump requires a predetermined time from starting to stabilize and changes after heating, the heating capacity of the heat pump changes depending on the heating load or the like, so that the first flow regulating valve and the second flow regulating valve are dependent on the heating capacity of the heat pump circuit. Adjust the degree of opening. As a result, even if the heating capacity of the heat pump circuit is changed, the tapping amount and the reheating capacity are appropriately adjusted to achieve stabilization. The heat capacity of the heat pump circuit can be detected by the refrigerant temperature of the first heat exchanger, the rotation speed of the compressor, or the like.

In addition, since the hot water is circulated in the heating circuit to which the first heat exchanger, the first flow regulating valve, and the second heat exchanger are sequentially connected during the reheating, when hot water is heated during the reheating, a part of the hot water is supplied through the hot water supply pipe. Even if it flows into a tapping side and mixes a part of water supply from the downstream side, there exists a possibility that tapping temperature may exceed set temperature.

Therefore, the hot water of the hot water guided to the hot water supply port is detected without bypassing the hot water supply pipe, and based on the detected temperature, the opening degree of the second flow regulating valve and the amount of water supplied downstream of the flow regulating valve are adjusted to tap water. A temperature adjusting means for adjusting the temperature is provided. Thereby, when hot water temperature more than predetermined temperature is detected, for example, a desired temperature can be heated without delay by tightening the opening degree of a 2nd flow regulating valve, and increasing water supply amount.

In such a hot water supply apparatus, it is preferable to set it as the 3-way valve which can integrate a 1st flow volume control valve and a 2nd flow volume control valve, and can adjust flow volume. Thereby, installation cost, such as material cost and welding work cost, can be reduced, and the low cost hot water supply apparatus can be provided, maintaining a function.

In addition, the refrigerant of the heat pump circuit preferably uses carbon dioxide suitable for heating the heated fluid. According to this, in the first heat exchanger, the carbon dioxide is exchanged between the refrigerant inlet to the refrigerant outlet of the refrigerant heat transfer tube and the water supply inlet to the water supply outlet of the heat exchanger tube when heat-exchanging the hot water and the heated fluid by the counter flow. Since the temperature difference between the gas and the feed water becomes substantially uniform in each part, the heating efficiency can be improved.

In this case, the heat pump circuit preferably includes control means for controlling the valve opening of the pressure reducing valve and the rotation speed of the compressor. That is, the temperature of the refrigerant on the high pressure side can be increased by adjusting the valve opening degree of the pressure reducing valve to control the superheat degree of the evaporator, and the heating capacity of the heat pump circuit can be increased by adjusting the refrigerant circulation amount by adjusting the rotation speed of the compressor. . Thereby, the heating capability in the case of using carbon dioxide as a refrigerant can be improved further.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described based on drawing. 1 is a configuration diagram of a heat pump hot water supply device according to the present invention. As shown in the figure, the heat pump hot water supply device includes a heat pump refrigerant circuit 1, a hot water supply circuit 3, and operation control means 5. As the heat pump refrigerant circuit 1, a two cycle system composed of two refrigerant circuits is adopted, and the first in which the compressor 7a, the gas cooler 9a, the pressure reducing device 11a, and the evaporator 13a are sequentially connected in series. It consists of a closed circuit, the 2nd closed circuit which connected the compressor 7b, the gas cooler 9b, the decompression device 11b, and the evaporator 13b in order directly, and the refrigerant | coolant is enclosed in each circuit.

The compressors 7a and 7b are capable of capacity control, and operate at a large capacity when a large amount of hot water is supplied. Here, the compressors 7a and 7b are controlled from a low speed (e.g., 1000 revolutions per minute) to a high speed (e.g., 8000 revolutions per minute) by PWM control, voltage control (e.g., PAM control), and combination control thereof. Rotation speed can be controlled. The water refrigerant heat exchanger (15) consists of a refrigerant side heat exchanger tube and a water supply side heat exchanger tube, and the gas coolers 9a and 9b function as the refrigerant side heat transfer tubes 9a and 9b, respectively, and the refrigerant side heat exchanger tubes 9a and 9b. ) And the water supply side heat transfer tubes 9c and 9d are exchanged. The evaporator 13a, 13b is comprised with the air-refrigerant heat exchanger which heat-exchanges air and a refrigerant | coolant.

The defrost solenoid valves 17a and 17b include an on-off valve that opens only during energization of the electromagnetic coil and the electromagnetic coil, and bypasses the outlet side of the compressors 7a and 7b and the inlet side of the evaporators 13a and 13b. It is arranged to pass, and the evaporators 13a and 13b open the on / off valves when the frost is attached to guide the high temperature and high pressure refrigerant gas discharged from the compressors 7a and 7b to the evaporators 13a and 13b to melt the frost. have.

The hot water supply circuit 3 is composed of a hot water supply circuit, a direct hot water supply circuit, a tank hot water supply circuit, a tank reheating circuit, a bath water refilling circuit, a bath water reheating circuit, and a bath water reheating heating circuit. The water storage circuit and the tank reheating circuit include a water storage tank 21, a pipe 25, a tank circulation pump 23, a pipe 27, a pipe 29, a water supply side heat pipes 9c and 9d, a pipe 31, It consists of a closed circuit which connects the piping 33, the tank side flow regulating valve 35, and the piping 37 one by one, and the piping 25 and 37 are respectively connected to the bottom part and the top part of the water storage tank 21, have. That is, the water drawn out from the lower portion of the storage tank 21 forcibly by the tank circulation pump 23 is led to the water refrigerant heat exchanger 15 for heat exchange, and the heated hot water is stored at the upper portion of the storage tank 21. It is supposed to be.

In the direct hot water supply circuit, the water supply port 40 is connected to the bypass valve 45 via a pipe 47 having a pressure reducing valve 43, and thereafter, the pipe 49, the water supply check valve 51, and the pipe ( 29), the water supply side heat transfer pipes 9c and 9d, the pipe 31, the pipe 39, the flow regulating valve 41, the pipe 47, the pipe 52, and the hot water inlet 53 are sequentially connected in series. It is composed. As a result, the water supplied from the water supply port 40 is led to the water refrigerant heat exchanger 15 to be heat-exchanged, and the heated hot water is heated from the water supply port 53. In addition, the amount of hot water discharged from the hot water supply port 53 can be adjusted by adjusting the opening degree of the flow rate control valve 41.

In the tank hot water supply circuit, the water supply port 40 is connected to the bypass valve 45 via a pipe 47 having a pressure reducing valve 43, and thereafter, the pipe 49, the pipe 54, and the water storage tank 21. ), The pipe 37, the tank side flow control valve 35, the pipe 33, the pipe 39, the flow control valve 41, the pipe 47, the pipe 52, and the hot water inlet 53 in order. It is connected in series and comprised. That is, since the hot water is filled in the water storage tank 21, when the water supply having a predetermined water pressure is introduced into the tank 21 from the bottom portion, the hot water is discharged from the top portion with the increase in the pressure in the water storage tank 21. Thus, the hot water supply port 53 is hot water tapping.

The bath water filling circuit is connected to the bypass valve 45 via a pipe 47 having a pressure reducing valve 43, and thereafter, a pipe 49, a water supply check valve 51, and a pipe ( 29, water supply side heat transfer pipes 9c and 9d, pipe 31, pipe 39, flow control valve 41, pipe 47, bath water injection valve 55, pipe 57, bath water flow sensor ( 59, the piping 61, the bath water supply member 63, and the bathtub 65 are connected in series, and are comprised. As a result, the water supplied from the water inlet is led to the water refrigerant heat exchanger 15 to be exchanged with heat, and is heated in the bath 65 after being heated. In addition, when filling bath water, the hot water supply by the water storage tank 21 can be performed in the range which the water supply of the water storage tank 21 does not become less than the preset minimum water storage amount with the hot water supply by a bath water filling circuit.

In the bath water reheating circuit, the tub 65 is connected to the bath water circulation pump 71 via a pipe 69 including a bath water tapping member 67, and then the pipe 73, the bath water heat pipe 77a, and the pipe ( 81, the piping 61, the bath water supplying member 63, and the bathtub 65 are connected in series. That is, the bath water reheating circuit is configured to return the bath water extracted from the bath 65 by the bath water circulation pump 71 to the bath water heat exchanger 75 and to heat it, and then return it to the bath 65. Further, the bath water heat exchanger 75 guides a part of the hot water heated by the water refrigerant heat exchanger 15 to the hot water heat transfer tube 77b to heat the bath water by heat exchange.

The bath water reheating heating circuit includes a tank circulation pump 23, a pipe 27, a pipe 29, a water supply side heat pipes 9c and 9d, a pipe 31, a bypass pipe 83, and a flow control valve 85. And the closed circuit which connects the hot water heat exchanger tube 77b and the piping 87 in order. That is, a part of the hot water heated by the water refrigerant heat exchanger 15 is led to the bath water heat exchanger 75 through the bypass pipe 83 to heat the bath water. Here, the amount of hot water of the hot water guided to the bath water heat exchanger 75 can be adjusted by adjusting the opening degree of the flow regulating valve 85.

The operation control means 5 is, for example, a water supply water quantity sensor 110 for detecting the water supply water quantity, a thermistor 111 for detecting the water supply temperature, and a thermistor for detecting hot water in the vicinity of the outlet of the water refrigerant heat exchanger 15 ( 113, the thermistor 115 for detecting the tapping temperature, the pressure sensor for detecting the discharge pressure of the compressors 7a, 7b, the water level sensor for detecting the water level in the bath 65, etc. Each device is controlled based on these signals and the user's intention (input value). For example, when an operating condition is input to the sink remote controller 101 or the bathtub remote controller 103, an operation signal is output from the control apparatus 104 to the component of each circuit based on these input values. Specifically, operation stop of the heat pump refrigerant circuit 1, rotational speed control of the compressors 7a and 7b, operation control of the tank circulation pump 23, the bath water circulation pump 71, and the bypass valve 45. Operation switching control such as flow control valves 35, 41, 85, hot water injection solenoid valve 55, operation of a hot water operation, hot water supply operation, bath water refilling operation, bath water reheating operation, and the like.

The storage tank 21 is composed of a small-capacity tank formed vertically and long in a cylindrical shape, and has a small capacity of about 1/3 to 1/5 of the storage tank in the conventional storage system. In this water storage tank 21, water and hot water are separated and stored in the lower layer and the upper layer, respectively, by the difference in density. Thereby, when the tapping temperature of the hot water supplied directly from a hot water supply circuit is low, hot water of high temperature in the boiling water tank 21 can be supplied, and the tapping temperature can be adjusted.

In addition, a bath water check valve 93 is provided in the pipe 91 that communicates the pipe 81 and the pipe 73 so that water is supplied to the bath water circulation pump 71 at the time of bath water hot water supply. A relief valve 97 is installed in the pipe 95 branched from the pipe 37 on the water supply side of the water storage tank 21 to operate when the water pressure in the water storage tank 21 rises above a predetermined level so as to perform pressure protection. It is. The bypass valve 45 has a function of distributing the water supplied to the pipe 49 and the pipe 50. For example, the bypass valve 45 supplies water for heating to the water refrigerant heat exchanger 15 through the pipe 49. On the other hand, the remaining water is supplied to the heated water via the pipe 50 to adjust the tapping temperature.

Next, the basic operation of the heat pump water heater of the present embodiment will be described with reference to FIGS. 1 to 4. In addition, description is abbreviate | omitted about the operation | movement operation immediately after installation. 2 is a flowchart showing an operation during hot water supply of the heat pump hot water supply device according to the present embodiment. If the faucet of the hot water supply port 53 is opened in step S111 and hot water taps out, it proceeds to step S112 and S113 and a direct hot water operation and a tank hot water operation are started simultaneously. That is, in the direct hot water supply operation, the compressors 7a and 7b are started by the operation control means 5 to start the operation of the heat pump circuit 1, and the hot water heated by heat exchange by flowing water directly into the hot water supply circuit. To tap. In addition, in the tank hot water operation, water flows through the tank hot water circuit so as to tap the hot water in the water storage tank 21.

Here, the heat pump refrigerant circuit 1 feeds the high temperature refrigerant compressed by the compressors 7a and 7b to the water refrigerant heat exchanger 15, so that the heating capability of the water in the water supply pipes 9c and 9d with time passes. Although increased, at the start of operation, the refrigerant does not reach a sufficient high temperature and high pressure, and since the whole water refrigerant heat exchanger 15 is cooled, the heating capacity for heating the water is not sufficient. Therefore, the operation control means 5 controls the rotation speed of the compressors 7a and 7b for a predetermined time until the heating capability of the heat pump refrigerant circuit 1 becomes stable, and starts the time of direct hot water supply operation. To, for example, about 2 to 3 minutes.

The tank hot water supply operation is not performed for a predetermined time immediately after the start of operation. In step S114, the operation control means 5 detects whether or not the heating capability of the heat pump refrigerant circuit 1 is stabilized and continues the tank hot water operation. Determine the stop. If it is determined here that the operation has been stopped, the flow proceeds to step S115 where the tank hot water supply operation is stopped and is switched only to the direct hot water operation. As a method for determining the heating capability of the heat pump refrigerant circuit 1, as shown in step S116, for example, the temperature or flow rate of the hot water flowing out of the water supply side heat transfer tubes 9c and 9d in the water refrigerant heat exchanger 15. Is detected by the temperature detection thermistor 113, the flow sensor 110, or the like, and it is determined whether the detected value is greater than or equal to the predetermined value, and if it is greater than or equal to the predetermined value, the heating capability is determined to be stable.

Thus, the heating at the start of operation is adopted by adopting a two-stage hot water supply system in which the hot water is excessively heated from the boiling water tank 21 at the start of operation, and then the hot water heated by the water refrigerant heat exchanger 15 is directly heated. The delay can be eliminated and the capacity of the water storage tank 21 can be made very small. In addition, the operation control means 5 stops the tank hot water supply operation when the hot water residual amount of the water storage tank 21 becomes below a predetermined value, and operates only by direct hot water operation. At this time, the heating capability of the heat pump refrigerant circuit is realized by the two cycle method, about 25 to 30 kPa. According to the heating method by the heat pump, even if the heating capacity is about 25 to 30 kW, the power consumption required is about 5 to 6 kW.

When the hot water supply is finished and the tap of the hot water supply port 53 is closed, when the tank hot water operation and the direct hot water operation are performed immediately after the hot water supply, both the tank hot water operation and the direct hot water operation are stopped by step S115 and step S117, In the case where the tank hot water supply operation is stopped and only the hot water supply operation is performed, the direct hot water supply operation is stopped in step S117.

Next, after the operation control means 5 stops the tank hot water supply operation and the direct hot water operation, the tank water hot water operation is started in step S118, and the water storage amount higher than or equal to the set temperature of the water storage tank 21 by the thermistor 112 or the like. In step S119, the amount of cold water is detected. If the low amount of water is more than the set amount, the flow proceeds to step S120 to end the operation. On the other hand, when it is less than the set amount, the tank circulating pump 23 is operated in addition to the heat pump refrigerant circuit 1, and the tank reheating operation is performed so that the low water amount becomes more than the set amount. Further, even after the hot water supply is stopped, if the amount of hot water in the water storage tank 21 is almost equal to the preset value due to the use of the water for a short time, it is determined that the water heating is completed and the tank is not heated again.

As described above, in any operation, the operation control means 5 has a function of a storage operation every time that the tank storage operation is performed until the storage capacity of the set amount is reached after the operation is completed. Therefore, the hot water of a predetermined temperature and a set amount is always stored in the storage tank 21, the hot water temperature fall at the start of operation is eliminated, and the heat loss by excessive storage is reduced. Moreover, since it is not necessary to store high temperature hot water more than necessary, the energy efficiency of a heat pump improves. Moreover, according to this embodiment, although the storage tank 21 is provided, the delay of the heating capability at the time of a heat pump start is assisted, but it is not limited to this.

Next, the hot water filling operation in automatic bath water operation will be described using the flowchart of FIG. In addition, the description about operation similar to FIG. 2 is simplified. First, when the bath water automatic button is pressed in step S121, the timer 121 starts time measurement. Subsequently, if it is determined in step S123 that the set time has come, the flow proceeds to steps S124 and S125 where the tank hot water operation and the bath water hot water operation are performed at the same time. In the bath water hot water operation, hot water heated by the bath water filling circuit is directly heated in the bath 65. That is, for two to three minutes immediately after the start of the heat pump operation, the hot water hot water operation and the tank hot water operation are simultaneously performed, and the hot water supply amount and the hot water temperature are detected by the temperature detection thermistor 115 and the flow rate sensor 125 during that time. Then, when the tank hot water supply operation is stopped in step S127 and the tank hot water operation is stopped in step S129, the operation is performed only for the bath water hot water operation. During the bath water hot water operation, the hot water temperature and the hot water amount in the bath 65 are detected continuously or periodically and the following control is performed by the operation control means 5.

First, the heat pump refrigerant circuit 1 controls the rotation speed and the water supply flow rate of the compressors 7a and 7b in step S131, and subsequently determines whether the hot water supply temperature is within the range of the set temperature in step S133. And when it exists in the range of set temperature, it progresses to step S135, and when it is out of a range, control of step S131 is repeated so that it may be in a range. Subsequently, in step S135, the hot water temperature and the hot water amount in the bath 65 are detected by the temperature detection thermistor 127 and the water level sensor 129, respectively, and are determined based on the detected value. If the hot water temperature and the hot water amount have reached the set amount, the flow proceeds to step S137, where the hot water hot water operation is stopped, and if the set amount is not filled, the hot water is continued.

Next, the bath water reheating operation in automatic bath water operation will be described using the flowchart of FIG. First, when the bath water automatic button is pressed in step S141, the hot water temperature and hot water amount in the bath 65 are detected by the temperature detection thermistor 127 and the water level sensor 129, and the hot water temperature and hot water amount detected in step S143 are subsequently. It is judged whether or not it is in the range of each setting value. If these detected values are within the range of the set value, the flow advances to step S153 to omit the bath water reheating operation. If the detection values are out of the range, the flow advances to step S145 to start the bath water reheating operation.

In the bath water reheating operation, the bath water circulating in the bath water reheating circuit is heated by heat exchange with hot water of hot water circulating in the bath water reheating circuit. During the bath water reheating operation, the hot water temperature and the hot water amount in the bath are continuously or periodically detected, and the rotation speed and the water supply flow rate of the compressors 7a and 7b are controlled in step S147 based on these detected values. 3, in step S149 and S151, the hot water temperature and the hot water temperature in the bath 65 and the amount of hot water are respectively determined. If the temperature is within the set value, the flow advances to step S153 to stop the bath water reheating operation.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment which concerns on this invention is described in detail. In the bath water reheating heating circuit, a water flow rate heat exchanger (2) is provided by placing a flow rate adjustment valve 85 in the bypass pipe 83 on the upstream side of the bath water heat exchanger 75 to adjust the opening degree of the flow rate adjustment valve 85. The amount of hot water heated in 15) and introduced into the bath water heat exchanger 75 is adjusted. On the other hand, in the direct hot water supply circuit, the flow rate adjusting valve 41 is provided in the pipe 39 upstream of the hot water inlet 53 to adjust the amount of hot water heated by the water refrigerant heat exchanger 15 from the hot water supply circuit. It is supposed to. The hot water amount adjustment of the hot water flowing into the bath water heat exchanger 75 may be adjusted by the rotation speed of the tank circulation pump 27 or the like instead of the above.

Next, the operation of each circuit in the case where a tapping request is received from the tapping terminal during the bath water reheating operation will be described with reference to Table 1. FIG. In addition, in order to reheat the bath water, it is assumed that the cold bath water remains in the bath 65. Table 1 shows the state transition when there is a tapping request at the time of reheating bath water.

step User usage state Heat pump refrigerant circuit Hot water circuit (direct tapping circuit, bath water reheating circuit, water bath reheating circuit) Bath water reheating circuit (bath circulation circuit) One Waiting stop stop stop 2 "Bath automatic" on Start driving Waiting for driving Waiting for driving 3 (About 2 minutes later) Operation (in function) Start of operation (bath reheating heating circuit: bath water heat exchange hot water circulation start) Waiting for driving 4 (About 4 minutes later) Driving (versus function) Driving (bath reheating heating circuit: bath water heat exchange temperature high) Start of operation (bath start circulation) (About 10 minutes later) Driving (versus function) Driving (bath reheating heating circuit: bath water heat exchange temperature high) Driving (in bath temperature) 5 Tapping Driving (versus function) Tapping operation from direct tapping circuit (bath reheating heating circuit: bath water heat exchange hot water circulation amount throttling) Driving (in bath temperature) 6 (About 1 minute later) Driving (Function Extra Large) Tapping operation from direct tapping circuit (bath reheating heating circuit: bath water heat exchange hot water circulation return) Driving (in bath temperature) 7 Tapping stop Driving (Function Extra Large) Driving (bath reheating heating circuit: bath water heat exchange temperature high) Driving (in bath temperature) (About 1 minute later) Driving (versus function) Driving (bath reheating heating circuit: bath water heat exchange temperature high) Driving (in bath temperature) (About 5 minutes later) Driving (versus function) Driving (bath reheating heating circuit: bath water heat exchange temperature high) Operation (bath temperature proper temperature) 8 "Bath water automatic" completion Operation (in function) Operation (bath reheating heating circuit: bath water heat exchange hot water circulation stop) (storage tank reheating circuit: tank cold water circulation start) After a certain time, stop Waiting Operation (in function) Operation (storage reheating circuit: tank cold water circulation) stop (After about 1-2 minutes) Operation (in function) Operation (Storage reheating circuit: tank bottom temperature high circulation stop) stop stop stop stop

First, in the user standby state of step 1, the heat pump refrigerant circuit, the hot water supply circuit (direct hot water heating, bath water reheating, reheating the hot water tank), and the bath water reheating circuit are all stopped. Next, in step 2, when the user presses the "bath water automatic" switch on the remote control in hope of bathing, the bath water reheating operation is started, and the heat pump refrigerant circuit 1 starts the operation. After about 2 minutes, in step 3, the flow regulating valve 85 is opened to a predetermined opening, the circulation pump 23 is operated, and the hot water heated by the water refrigerant heat exchanger 15 is supplied to the bath water heat exchanger 75. Into the hot water heat transfer tube (77b) of the circulating water is circulated in the bath reheating heating circuit. At this point in time, the flow regulating valve 41 is in a completely closed state.

After about 4 minutes, when the temperature of the bath water heat exchanger 75 reaches a high temperature in step 4, the bath water circulation pump 71 starts operation, and the bath water in the bath 65 is bath water in the bath water reheating circuit. Heated in the bath water heat pipe (77a) of the heat exchanger 75 is returned to the bath (65). In the meantime, the capacity of the heat pump refrigerant circuit 1 is appropriately adjusted by adjusting the rotation speeds of the compressors 7a and 7b.

After that, in step 5, when the user taps the tap of the tapping terminal, the tapping request is performed, and the bath water reheating operation is continuously performed, the hot water supply circuit 3 performs the direct tapping operation and the bath water reheating operation simultaneously. All. At this time, the flow rate adjusting valve 41 is opened so that the temperature and tapping amount of the hot water tapping out of the tapping opening 53 by the hot taping operation are prioritized. That is, the operation control means 5 reduces the circulation amount of the hot water circulating the bath water reheating heating circuit by tightening the opening degree of the flow regulating valve 85 so that a part of the hot water is directly distributed to the tapping circuit.

Next, in step 6, after about one minute, the operation control means 5 further increases the heating capacity of the heat pump refrigerant circuit 1, and consequently opens the opening of the flow rate regulating valve 85 to open the bath water. Again, the amount of hot water circulating in the heating circuit is increased to maintain a predetermined heating capacity. Subsequently, in step 7, if the tapping from the hot water supply port 53 is stopped and the water temperature in the bath 65 is heated to a predetermined temperature, the process proceeds to step 8 and after a certain time elapses, the bath water re-heating operation is stopped. do.

According to the above-described configuration and control, even when hot water is directly heated from the hot water supply circuit while the bath water is being heated in the bath water reheating heating circuit, the bath water reheating is adjusted by adjusting the opening degree of the flow regulating valves 41 and 85. The required heating capacity can be achieved without interruption. In addition, the capacity of the circulation pumps 23 and 71 in the circuit is determined in consideration of the difference in the hot water flow rate and the pressure loss in the direct tapping circuit and the bath water reheating heating circuit.

By the way, the heat pump refrigerant circuit 1 generally changes its heating capability at any time in accordance with a heating load or the like. For example, the heating capacity of the heat pump refrigerant circuit 1 at the time of bath water reheating operation alone is about 10 kW, but when hot water occurs simultaneously, the heating capacity of the heat pump refrigerant circuit 1 is 20 to 30. You need to know about. Then, the operation control means 5 calculates the required heating capacity from the difference between the hot water set temperature of the remote controller and the actual hot water temperature detected by the hot water temperature thermistor 115 and the amount of hot water detected by the water supply quantity sensor 110. Although the rotation speed of the compressors 7a and 7b is adjusted to raise the heating capability of the heat pump refrigerant circuit 1 to the required heating capability, the heating capability of the heat pump refrigerant circuit 1 does not rise suddenly.

Thus, the difference between the rotation speed of the compressors 7a and 7b, the hot water set temperature of the remote controller and the actual hot water temperature detected by the hot water temperature thermistor 115, and the amount of hot water detected by the water supply water quantity sensor 110 is shown. The opening degree of the flow regulating valves 41 and 85 is adjusted in accordance with the heating capacity determined by. At this time, it is important to cope with the hot water required rather than reheating the bath water, and therefore, first, the opening degree of the flow regulating valve 41 is gradually opened as the heating capacity of the heat pump refrigerant circuit 1 increases, and the heating capacity By further opening the degree of opening of the flow rate control valve 85 at a time point in which a margin is left, it is possible to adjust and stabilize the tapping amount of the hot water supply circuit and the bath water reheating ability.

Next, a description will be given of the control when hot water is directly performed during the bath water re-heating operation. In FIG. 1, the hot water circulating in the bath water reheating heating circuit when heated again is heated to a high temperature (for example, about 60 to 80 ° C). Therefore, when hot water supply is directly performed during the bath water reheating operation, a part of the hot water flows directly into the tapping circuit through the pipe 39, and at this time, from the downstream bypass valve 45 through the pipe 50. Even if water is supplied, there is a possibility that the hot water is set higher than the hot water setting temperature (for example, up to 60 ° C, usually about 35 to 42 ° C).

Therefore, the thermistor 100 which detects hot water is arrange | positioned upstream of the flow regulating valve 41 in the piping which communicates a bath water reheating heating circuit and the hot water supply port 53, and the operation control means 5 is a thermistor. On the basis of the detected temperature difference between the 100 and the thermistor 115 for detecting the tapping temperature, the opening degree of the flow regulating valve 41 is tightened to limit the flow rate of the incoming hot water. And the hot water of desired temperature can be tapped out without delay by adjusting the opening degree of the bypass valve 45, and increasing the quantity supplied.

In addition, since the hot water stored in the water storage tank 21 at the time of reheating of the water storage tank 21 is also high temperature (for example, about 60-90 degreeC), it can be directly removed from the tapping circuit at the time of reheating of the water storage tank 21. Even when tapping is performed, there is a possibility that the above problems occur. Also in this case, by controlling the opening degree of the flow regulating valve 41 and the bypass valve 45 as mentioned above, hot water of a desired temperature can be heated without delay.

Next, another embodiment of the flow regulating valve 41 and the flow regulating valve 85 will be described. FIG. 5 shows a configuration diagram of a heat pump hot water supply device formed by applying a flow rate adjustment three-way valve 161 in which the flow rate control valves 41 and 85 of FIG. 1 are integrated. In addition, in FIG. 5, each sensor of FIG. 1 is abbreviate | omitted, and the part which is common in FIG. 1 is attached | subjected with the same code | symbol, and description is abbreviate | omitted.

The flow rate adjusting three-way valve 161 has three flow ports 163, 165, and 167, and the flow port 163 is connected to the hot water outlet side of the water refrigerant heat exchanger 15 via a pipe 169, The distribution port 165 is connected to the hot water inlet side of the bath water heat exchanger 75 via the pipe 83, and the distribution port 167 is connected to the hot water supply port 53 of the hot water supply circuit directly via the pipe 173. have. Here, the flow rate adjustment three-way valve 161 adjusts the opening degree of the distribution ports 165 and 167 based on the instruction | command of the operation control means 5, and the flow rate adjustment valve 41 and the flow rate adjustment valve 85 are adjusted. Can be performed integrally. In addition, the three-way valve 161, which is well-known, is applied to the flow rate adjustment three-way valve 161, and the opening degree (including occlusion) of each outlet is changed according to the movement amount of the valve member moving inside the casing by using a stepping motor or the like as a power source. The flow rate ratio can be adjusted by adjusting.

In addition, it is preferable to use carbon dioxide as a refrigerant | coolant used for the heat pump refrigerant circuit 1 of this embodiment. The carbon dioxide gas, which is a refrigerant, is compressed by the compressors 7a and 7b so that the pressure and the temperature become a supercritical state above the critical pressure and the critical temperature of the carbon dioxide. When heat exchanged between the high temperature refrigerant and the water to be heated in the opposite flow, between the refrigerant inlet of the refrigerant side heat exchanger tubes 9a and 9b of the water refrigerant heat exchanger 15 and the refrigerant outlet, and the water supply side heat exchanger tube 9c , 9d) from the water supply inlet to the water supply outlet, the temperature difference between the refrigerant of the heating fluid and the water of the heated fluid becomes almost uniform in each part, thereby improving the heating efficiency.

In the heat pump refrigerant circuit 1, by adjusting the pressure reducing valves 11a and 11b, the pressure on the high pressure side is adjusted, and the degree of superheat of the evaporators 13a and 13b is adjusted to adjust the evaporators 13a and 13b. The enthalpy difference between the inlet side and the outlet side can be adjusted. In addition, the refrigerant circulation amount can be adjusted by adjusting the rotation speeds of the compressors 7a and 7b. Therefore, by adjusting and controlling them with the operation control means 5 to increase the refrigerant temperature and the refrigerant circulation amount on the high pressure side of the heat pump refrigerant circuit 1, the heating capacity of the water refrigerant heat exchanger 15 is increased to reheat the bath water. Ability and hot water supply ability can be improved further.

As described above, according to the present embodiment, the water supplied is directly heated and tapped by using the heat pump of the present invention as a heating means at the time of hot water supply and reheating. In other words, since the heat pump has a large heating capacity, it is possible to directly supply hot water of hot water supply and re-heating at the same time without increasing the size of the apparatus, and does not cause hot water depletion. In addition, the heat pump is economical because the power consumption is small compared to the magnitude of the heating capacity.

In addition, since hot water heated in the heat pump refrigerant circuit 1 is appropriately distributed to each circuit by the flow regulating valves 41 and 85 or the flow regulating three way valve 161, even when hot water is heated during the reheating of the bath water. The warming continues, and as a result, the warming time can be shortened and the usability can be improved. And since the ratio of the amount of hot water distribute | distributed to each circuit is adjusted according to the heating capability of the heat pump refrigerant circuit 1, the warming and hot water supply ability are improved and stabilized, and usability can be improved.

In addition, when tapping is performed during bath water reheating, the opening degree of the flow regulating valve 41 and the supply amount of the supply water are adjusted based on the detected temperature difference between the thermistor 100 and the thermistor 115, so that the high temperature equal to or higher than the set temperature. Water tapping can be suppressed and the safety at the time of tapping can be maintained.

According to the present invention, hot water depletion can be eliminated, and bath water reheating ability can be improved.

Claims (6)

A heat pump circuit for heating the water supply via a first heat exchanger, a water supply pipe communicating a water supply source and a water supply port of the first heat exchanger, a hot water supply tube communicating the hot water outlet of the first heat exchanger and a hot water supply port, A heating circuit for bypassing the water supply pipe and the hot water supply pipe through the second heat exchanger to direct hot water heated in the first heat exchanger to the second heat exchanger by a pump, and the tub water extracted from the tub to the second heat exchanger. A reheating circuit for heating to return to the bath, a first flow control valve for bypassing the hot water supply pipe to adjust the amount of hot water introduced to the second heat exchanger, and directing the hot water supply pipe without bypassing the hot water supply pipe. The heat pump hot water supply device provided with the 2nd flow volume adjustment valve which adjusts the amount of hot water used. The heat pump hot water supply apparatus according to claim 1, wherein an opening degree of the first flow regulating valve and the second flow regulating valve is adjusted according to a heating capacity of the heat pump circuit. According to claim 1, The opening degree of the second flow control valve and the amount of water supplied downstream of the flow control valve is adjusted based on the detected temperature of the hot water guided to the hot water supply opening without bypassing the hot water supply pipe And a temperature adjusting means for adjusting the tapping temperature. The heat pump hot water supply apparatus according to claim 1, wherein the first flow regulating valve and the second flow regulating valve are integrated into a three-way valve capable of adjusting the flow rate. The heat pump hot water supply apparatus according to any one of claims 1 to 4, wherein the refrigerant used in the heat pump circuit is carbon dioxide. 6. The heat pump circuit of claim 5, wherein the heat pump circuit includes a pressure reducing valve for depressurizing the refrigerant heat exchanged in the first heat exchanger, and a compressor for discharging the high pressure refrigerant to the first heat exchanger. A heat pump hot water supply device, comprising: control means for controlling the number of revolutions of the engine.

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