JP6969223B2 - Heat pump heat source machine - Google Patents

Description

The present invention relates to a heat pump heat source machine that supplies heated hot water to a hot water storage heater.

Conventionally, a hot water storage heater that uses hot water heated by the heating operation of a heat pump heat source machine to perform heating operation and stores hot water heated by heating operation in a hot water storage tank to supply hot water at a set temperature is widely used. Has been done. During the heating operation, in the heat exchanger for heating of the hot water storage and hot water supply heating device, the heating heat medium is heated to the heating required temperature of the heating terminal by heat exchange between the hot water heated by the heating operation and the heating heat medium supplied to the heating terminal. ..

Immediately after the start of heating operation, the amount of heat required for heating is large in order to warm a low-temperature room, and the amount of heat required for heating decreases as the room temperature rises. At this time, the heat pump heat source machine reduces the operating rotation speed of the compressor that compresses the refrigerant, and adjusts the opening degree of the expansion valve, which is the expansion means of the refrigerant, to reduce the amount of heat supplied.

As the operating rotation speed of the compressor is reduced, the vibration of the compressor increases, and the stress and noise applied to the piping connected to the compressor may increase. Therefore, the lower limit value is set in advance for the operating rotation speed. Has been done. Therefore, in the heat pump heat source machine, for example, the compressor is stopped at a low load such that the required heat amount is lower than the supply heat amount when operating at the lower limit of the operating rotation speed, and the heating heat medium heated by the heating heat exchanger is used. It is configured to perform intermittent operation to restart the operation of the compressor when the temperature falls below the required heating temperature.

By the way, in the heat pump heat source machine, when the heat exchange with the air is hindered by frost generated in the evaporation heat exchanger by the low temperature refrigerant expanded by the expansion valve, the high temperature refrigerant compressed by the compressor is used as the on-off valve. It is configured to perform a defrosting operation to be distributed to the evaporative heat exchanger through the provided passage. Further, as in Patent Document 1, in a refrigerating system using a heat pump, the refrigerant compressed by the compressor for the retention of oil in the refrigerating heat exchanger, which occurs when the operating rotation speed of the compressor is low, is opened and closed. There is known a technique for eliminating the problem by periodically distributing it to a refrigerating heat exchanger through a passage provided with a valve.

Japanese Unexamined Patent Publication No. 2012-102919

As shown in FIG. 4, the operation of the compressor takes a certain amount of time from the start of operation at time t1 to the time t2 when the refrigerant temperature stabilizes, during which the energy efficiency of the heat pump heat source machine is low. Therefore, the energy efficiency of the heat pump heat source machine is lowered due to the intermittent operation of the compressor. In addition, the intermittent operation increases the chances of vibration of the compressor, which increases noise and may impair the durability of the heat pump heat source machine.

An object of the present invention is to provide a heat pump heat source machine capable of avoiding intermittent operation of a compressor and suppressing a decrease in energy efficiency at a low load in a heating operation.

The invention according to claim 1 is provided in the refrigerant circuit so as to bypass the condensed heat exchanger and the expanding means, and the refrigerant circuit connecting the compressor, the condensed heat exchanger, the expanding means, and the evaporative heat exchanger. A heat pump heat source machine equipped with a bypass passage, an on-off valve capable of opening and closing the bypass passage, and a blower for blowing air to the evaporation heat exchanger, and a refrigerant heated to a predetermined heating temperature by the condensed heat exchanger. By exchanging heat with hot water for heating the heating heat medium supplied to the heating terminal, the rotation speed of the compressor and the opening degree of the expansion means are controlled so that the temperature of the hot water is within a predetermined target temperature range. in the heat pump heat source apparatus that, when the compressor is operating at the lower limit rotation speed set to open the pre-SL-off valve if the hot water temperature becomes a temperature higher than the target temperature range, the opening and closing when the temperature of the refrigerant discharged from the compressor during opening of the valve begins to fall is characterized that you stops the operation of the blower.

With the above configuration, when the compressor is operating at the lower limit rotation speed at low load in the heating operation, the high temperature refrigerant can be distributed to the bypass passage, so that the amount of heat supplied to the hot water without stopping the compressor. Can be reduced. Therefore, it is possible to avoid the intermittent operation in which the compressor repeatedly stops and operates, suppress the decrease in energy efficiency of the heat pump heat source machine, suppress the generation of noise, and maintain the durability of the heat pump heat source machine. ..
Then, it is possible to suppress heat dissipation of the refrigerant in the heat of vaporization exchanger and suppress a decrease in energy efficiency of the heat pump heat source machine.

The invention of claim 2 is characterized in that, in the invention of claim 1, when the temperature of hot water becomes lower than the target temperature range while the on-off valve is open, the on-off valve is closed.

With the above configuration, when the temperature of the hot water drops below the lower limit of the target temperature range, the bypass passage is closed to increase the amount of refrigerant flowing through the condensate heat exchanger, and the amount of heat supplied to the hot water is increased to the target temperature range. Hot water can be heated to the temperature inside.

The invention of claim 3 is the invention of claim 1 or 2 , when the temperature of the refrigerant discharged from the compressor becomes lower than the heating temperature while the on-off valve is open, the on-off valve is used. It is characterized by closing.

With the above configuration, the refrigerant supplied to the condensate heat exchanger can be heated to a heating temperature to maintain the hot water at a temperature within the target temperature range.

The invention of claim 4 comprises a hot water storage tank for storing hot water, a hot water supply passage for adjusting the hot water of the hot water storage tank to a hot water supply set temperature, and a hot water supply passage in the invention of any one of claims 1 to 3. It is characterized in that heated hot water is supplied to the hot water storage tank of a hot water storage hot water supply heating device provided with a heating heat exchanger for exchanging heat between the hot water in the hot water storage tank and the heating heat medium.

With the above configuration, the hot water heated by the heat pump heat source machine can be used for heating and also for hot water supply. Therefore, if hot water is supplied while the on-off valve is opened to reduce the amount of heat supplied to the hot water, the on-off valve is closed to increase the amount of heat supplied to the condensate heat exchanger. Therefore, the amount of heat supplied to the hot water can be increased quickly.

According to the present invention, it is possible to avoid intermittent operation of the compressor when the load is low in the heating operation, so that it is possible to suppress a decrease in energy efficiency of the heat pump heat source machine.

It is a figure which shows the whole structure of the hot water storage hot water supply heating apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of a heat pump heat source machine. It is a figure which shows the structure of the hot water storage hot water supply heating apparatus. It is a figure which shows an example of the intermittent operation of the compressor which concerns on the conventional heat pump heat source machine.

Hereinafter, embodiments for carrying out the present invention will be described with reference to examples.

First, the overall configuration of the hot water storage / hot water supply / heating system 1 will be described with reference to FIGS. 1 to 3.
The hot water storage heating system 1 includes a heat pump heat source machine 2, a hot water storage heating device 3, and a heating terminal 4. The hot water storage hot water supply heating device 3 is connected to the heat pump heat source machine 2 by a hot water circulation passage 15, and the heating terminal 4 is connected by a heating circuit 13. Is connected to the hot water storage hot water supply heating device 3. Hot water circulates between the hot water storage heater 3 and the heat pump heat source machine 2 through the hot water circulation passage 15. Further, a heating heat medium circulates between the heating terminal 4 and the hot water storage hot water supply heating device 3 via the heating circuit 13.

Next, the heat pump heat source machine 2 will be described.
The heat pump heat source machine 2 has a refrigerant circuit 27 in which a compressor 22, a condensed heat exchanger 23, an expansion valve 24 (expansion means), and an evaporation heat exchanger 25 are connected by a refrigerant pipe 26 in an outer case 20. The refrigerant bypass passage 28 (bypass passage) branched from the refrigerant pipe 26 between the compressor 22 and the condensed heat exchanger 23 is provided with a defrosting on-off valve 28a (on-off valve) capable of opening and closing the refrigerant bypass passage 28, and expands. It is connected to the refrigerant pipe 26 between the valve 24 and the heat evaporation exchanger 25. Further, a refrigerant temperature sensor 29 for detecting the temperature of the refrigerant discharged from the compressor 22 is arranged in the refrigerant pipe 26 between the compressor 22 and the condensed heat exchanger 23. In the heat exchange passage portion 23a of the condensed heat exchanger 23 connected to the hot water circulation passage 15, the inlet temperature sensor 23b for detecting the temperature of the hot water on the inlet side of the condensed heat exchanger 23 and the temperature of the hot water on the outlet side are detected. The outlet temperature sensor 23c is arranged.

The heat pump heat source machine 2 controls the heating operation and the like by an auxiliary control unit 21 electrically connected to the control unit 16 of the hot water storage and hot water supply heating device 3 described later. In the heating operation, the defrosting on-off valve 28a is closed, the blower 25a that blows air to the compressor 22 and the evaporation heat exchanger 25 is driven, and the opening degree of the expansion valve 24 is adjusted to be sealed in the refrigerant pipe 26. Circulate the refrigerant.

The high-temperature refrigerant compressed in the compressor 22 by the heating operation and raised in temperature is introduced into the condensate heat exchanger 23. In the condensation heat exchanger 23, heat is exchanged between the high-temperature refrigerant and the hot water flowing through the heat exchange passage portion 23a connected to the hot water circulation passage 15, and the hot water is heated. The refrigerant that has been lowered in temperature by heat exchange and partially liquefied expands in the expansion valve 24, further lowers in temperature, and is introduced into the evaporation heat exchanger 25. In the evaporation heat exchanger 25, the refrigerant absorbs and vaporizes the heat of the outside air, and is introduced into the compressor 22 again.

Since the low-temperature refrigerant is supplied to the evaporative heat exchanger 25 by this heating operation, frost that hinders the heat exchange between the atmosphere and the refrigerant may be generated in the evaporative heat exchanger 25. At this time, the auxiliary control unit 21 performs a defrosting operation in which the defrosting on-off valve 28a is opened for a predetermined period in order to remove frost by using the refrigerant compressed by the compressor 22 and having a high temperature.

Next, the hot water storage hot water supply heating device 3 will be described.
The hot water storage hot water supply heating device 3 has functions such as hot water storage, hot water supply, pouring hot water into a bathtub, reheating hot water in a bathtub, and supplying a heating heat medium to a heating terminal 4 such as a floor heating panel. The hot water storage and heating device 3 includes a hot water storage tank 5, an auxiliary heat source machine 6, a reheating heat exchanger 7, a heating heat exchanger 8, a water supply passage 9, a hot water supply system passage 10, a hot water filling passage 11, and a bath reheating circuit. 12, The heating circuit 13, the heat exchanger going passage 14a, the heat exchanger return passage 14b, the hot water circulation passage 15, the control unit 16, the hot water mixing valve 35, etc. are provided in the outer case 30, and various settings of the hot water storage and heating device 3 are provided. An operation terminal 38 electrically connected to the control unit 16 is provided so that the same operation can be performed.

The hot water storage tank 5 stores hot water heated by the heat pump heat source machine 2. A plurality of hot water storage temperature sensors 5a to 5d are provided on the outer peripheral portion of the hot water storage tank 5 at intervals in the vertical direction, and can detect the hot water temperature of the plurality of storage layers in the hot water storage tank 5. In order to prevent heat dissipation of the stored hot water, the hot water storage tank 5 is covered with a heat insulating material (not shown).

The auxiliary heat source machine 6 is a known gas water heater having a burner, a heat exchanger, or the like built-in. The auxiliary heat source machine 6 is controlled by the control unit 16 to heat the hot water and supply the hot water only in a special case such as when the hot water in the hot water storage tank 5 cannot supply the hot water at the set temperature.

The water supply passage 9 supplies low-temperature clean water from the clean water source to the lower part of the hot water storage tank 5, and the upstream end is connected to the clean water source and the downstream end is connected to the lower part of the hot water storage tank 5 to detect the water supply temperature. A water supply temperature sensor 9a is provided. A water supply bypass passage 17 branched from the water supply passage 9 is connected to the hot water mixing valve 35 in order to supply clean water to the hot water supply system passage 10. The connection passage portion 18 connected to the heat exchanger return passage 14b is branched from the switching valve 19 provided in the water supply passage 9 on the downstream side of the branch portion. Low-temperature clean water can be supplied to the heat exchanger return passage 14b through the connection passage portion 18, and conversely, hot water can be supplied to the hot water storage tank 5 from the heat exchanger return passage 14b.

Next, the hot water supply system passage 10 will be described.
The hot water supply system passage 10 supplies the hot water stored in the hot water storage tank 5 to a desired hot water supply destination such as a hot water tap, and the hot water supply passage 31 connected to the hot water tap and the hot water mixing valve 35 from the upper part of the hot water storage tank 5 are provided. A hot water outlet 32 connected to the hot water supply passage 31 via the hot water supply passage 31, an auxiliary heating passage 33 branched from the hot water passage 32 and connected to the auxiliary heat source machine 6, an auxiliary heat source machine hot water passage 34 connected from the auxiliary heat source machine 6 to the hot water passage 32, etc. have.

In the hot water mixing valve 35 whose mixing ratio can be adjusted so that hot water can be supplied at the hot water supply set temperature, the hot water flowing through the hot water outlet passage 32 and the clean water supplied from the water supply bypass passage 17 are mixed and the hot water supply passage 31 is used. Hot water is supplied to the hot water tap, etc. The hot water filling passage 11 branched from the hot water supply passage 31 is connected to a bathtub (not shown) so that hot water can be filled. A hot water supply flow rate sensor 31a and a hot water supply flow rate adjusting valve 31b are arranged in the hot water supply passage 31, and a hot water discharge temperature sensor 32a for detecting the temperature of the hot water in the hot water discharge passage 32 is arranged in the hot water discharge passage 32.

A three-way valve 33a, a pressure pump 39, and the like are arranged in the auxiliary heating passage 33. The hot water outlet passage 34 of the auxiliary heat source machine is connected to the hot water discharge passage 32 via the flow rate adjusting valve 34a. The heat exchanger outbound passage 14a branched from the auxiliary heat source machine hot water outlet passage 34 on the upstream side of the flow control valve 34a is connected so as to be able to supply hot water to the reheating heat exchanger 7 and the heating heat exchanger 8.

Next, the hot water circulation passage 15 will be described.
The hot water circulation passage 15 is an upstream circulation passage portion 15a connecting the lower part of the hot water storage tank 5 and the heat exchange passage portion 23a of the heat pump heat source machine 2, and a downstream circulation passage portion 15b connecting the heat exchange passage portion 23a and the upper part of the hot water storage tank 5. It is equipped with. The upstream circulation passage portion 15a has a circulation pump 36 and a circulation switching valve 37. The circulation bypass passage portion 15c branched from the downstream circulation passage portion 15b is connected to the upstream circulation passage portion 15a via the circulation switching valve 37, the circulation switching valve 37 is switched to the circulation bypass passage portion 15c side, and the heat pump heat source machine 2 The hot water heated in 1 can be reheated by the heat pump heat source machine 2.

Next, the control unit 16 will be described.
The control unit 16 receives the heating request signal of the heating terminal 4, and based on the detection signal by the sensors arranged in each part of the hot water storage temperature sensors 5a to 5d, the hot water mixing valve 35, the circulation pump 36, and the pumping. The pump 39 and the like are driven, and the heat pump heat source machine 2 is heated and operated via the auxiliary control unit 21 to control hot water storage operation, hot water supply operation, heating operation and the like.

Next, the heating terminal 4 will be described.
The heating terminal 4 is, for example, a hot water type floor heating panel or a hot air heater, and includes a control unit (not shown) communicably connected to the control unit 16. During the heating operation, the control unit of the heating terminal 4 transmits to the control unit 16 a heating request temperature preset as a set temperature of the heating heat medium during the heating operation. The required heating temperature varies depending on the type of the heating terminal 4, but is set to, for example, a temperature of 40 ° C to 60 ° C.

Next, the hot water storage operation will be described.
In the hot water storage operation, hot water corresponding to the amount of heat required for hot water supply and hot water filling in the bathtub is stored in the hot water storage tank 5 by the heating operation of the heat pump heat source machine 2. Specifically, the circulation pump 36 is driven to heat the low-temperature hot water supplied from the lower part of the hot water storage tank 5 by the heat pump heat source machine 2, and the high-temperature hot water is stored from the upper part of the hot water storage tank 5.

Next, the hot water supply operation will be described.
When the hot water supply tap or the like is opened and the hot water supply flow rate sensor 31a detects a predetermined flow rate, the control unit 16 determines the hot water supply temperature of the hot water flowing through the hot water supply passage 31 based on, for example, the hot water temperature and the hot water supply temperature of the hot water supply passage 32. Adjusts the mixing ratio of the hot water mixing valve 35 so that the temperature becomes the hot water supply set temperature set by the operation terminal 38. If it is difficult to adjust the hot water supplied in the hot water storage tank 5 to the hot water supply set temperature by mixing it with clean water, the hot water mixed valve is heated by operating the auxiliary heat source machine 6 and the pressure pump 39. Supply to 35 to supply hot water.

Next, the reheating operation will be described.
In the reheating operation to heat the hot water in the bathtub, the hot water in the bathtub is circulated in the bath reheating circuit 12, and the hot water in the bathtub is exchanged with the hot water heated by the auxiliary heat source machine 6 in the heat exchanger 7 for reheating. To heat. At this time, the reheating on-off valve 7a is opened, the pressure feed pump 39 is driven, and the hot water heated by the heat pump heat source machine 2 or the auxiliary heat source machine 6 is introduced into the reheating heat exchanger 7 from the heat exchanger going passage 14a. .. The hot water introduced into the reheating heat exchanger 7 from the heat exchanger going passage 14a flows through the heat exchanger return passage 14b and returns to the auxiliary heat source machine 6.

Next, the heating operation will be described.
In the heating operation, in the heating heat exchanger 8, the heating heat medium is heated by heat exchange between the high-temperature hot water heated by the heating operation of the heat pump heat source machine 2 and the heating heat medium circulated in the heating circuit 13. At this time, the on-off valve 8a for heating is opened, the pressure feed pump 39 is driven, and the hot water in the upper part of the hot water storage tank 5 heated to a temperature within the target temperature range by the heat pump heat source machine 2 is used for heating from the heat exchanger outbound passage 14a. It is introduced into the heat exchanger 8. The hot water introduced into the heating heat exchanger 8 from the heat exchanger going passage 14a circulates through the heat exchanger return passage 14b and is supplied to the lower part of the hot water storage tank 5.

Since the control unit 16 heats the heating heat medium in the heating heat exchanger 8 to the heating heat medium temperature transmitted from the heating terminal 4, the temperature of the hot water introduced into the heating heat exchanger 8, that is, the heat pump heat source machine 2 The temperature of the hot water heated by is controlled to be maintained within a predetermined target temperature range. Therefore, the auxiliary control unit 21 controls the rotation speed of the compressor 22, the opening degree of the expansion valve 24, and the rotation speed of the blower 25a so that the temperature of the refrigerant discharged from the compressor 22 is maintained at a predetermined heating temperature. do. For example, when the required heating temperature is 40 ° C., the target temperature range is set to 50 ° C. to 60 ° C., which is, for example, 10 ° C. to 20 ° C. higher than the required heating temperature, and the heating temperature is, for example, 60 ° C. to 60 ° C., which is 10 ° C. higher than the target temperature range. It is set to 70 ° C. It should be noted that these temperatures are shown as an example and can be changed as appropriate.

The hot water introduced into the condensate heat exchanger 23 from the lower part of the hot water storage tank 5 by driving the circulation pump 36 is heated to a temperature within the target temperature range by heat exchange with the refrigerant at the heating temperature in the condensate heat exchanger 23. .. The heated hot water is stored in the upper part of the hot water storage tank 5, and is distributed in the order of the hot water outlet passage 32, the auxiliary heating passage 33, the auxiliary heat source machine 6, the auxiliary heat source machine hot water outlet passage 34, and the heat exchanger outbound passage 14a by the operation of the pressure feed pump 39. Then, it is introduced into the heat exchanger 8 for heating. At this time, the auxiliary heat source machine 6 does not heat the hot water. The heating heat medium is heated to the required heating temperature by heat exchange between the hot water introduced in the heat exchanger 8 and the heating heat medium, and the hot water after the heat exchange is the heat exchanger return passage 14b, the connection passage portion 18 and the downstream. It returns to the lower part of the hot water storage tank 5 via the water supply passage portion 9c. The heating heat medium circulates between the heating heat exchanger 8 and the heating terminal 4.

When the heating operation is started in a state where the heating terminal 4 is cold, the heat radiation amount in the heating terminal 4 is large, so that the heating heat medium becomes low temperature and returns to the heating heat exchanger 8. Therefore, the hot water that has exchanged heat with the heating heat medium becomes low in temperature and is introduced into the condensed heat exchanger 23 from the lower part of the hot water storage tank 5. As the room temperature rises due to the heating operation, the amount of heat required for heating decreases, and the hot water that has exchanged heat with the heating heat medium is introduced into the condensed heat exchanger 23 while the temperature remains high. Therefore, the auxiliary control unit 21 reduces the rotation speed of the compressor 22 so as to reduce the amount of heat supplied for heating the hot water in the condensate heat exchanger 23, and adjusts the opening degree of the expansion valve 24.

When the amount of heat required to heat the hot water is lower than the amount of heat supplied when the number of revolutions of the compressor 22 is lowered to the preset lower limit, the temperature of the hot water heated by the condensed heat exchanger 23 is high. The temperature becomes higher than the target temperature range. At this time, the auxiliary control unit 21 opens the defrosting on-off valve 28a and distributes a part of the refrigerant compressed by the compressor 22 to the refrigerant bypass passage 28. As a result, the amount of heat supplied can be reduced by reducing the amount of refrigerant supplied to the condensate heat exchanger 23 without stopping the compressor 22.

When the defrosting on-off valve 28a is opened, the high-temperature refrigerant compressed by the compressor 22 is mixed with the low-temperature refrigerant circulated through the expansion valve 24 and introduced into the evaporation heat exchanger 25. At this time, the temperature of the refrigerant introduced into the evaporation heat exchanger 25 becomes higher than the air temperature, and the heat of the refrigerant is radiated to the atmosphere in the evaporation heat exchanger 25. Further, since the refrigerant having a high temperature is supplied to the compressor 22, the temperature of the refrigerant detected by the refrigerant temperature sensor 29 rises. When the temperature of the refrigerant discharged from the compressor 22 begins to drop, the auxiliary control unit 21 stops driving the blower 25a and suppresses heat dissipation of the refrigerant in the heat evaporation exchanger 25. As a result, it is possible to suppress heat dissipation of the heated refrigerant to the atmosphere and suppress a decrease in energy efficiency.

When the amount of heat supplied is reduced and the heating operation is continued as described above, the temperature of the hot water introduced into the condensate heat exchanger 23 is lowered, and the temperature of the refrigerant supplied to the compressor 22 is lowered. When the temperature of the refrigerant discharged from the compressor 22 becomes lower than the heating temperature, the auxiliary control unit 21 closes the defrosting on-off valve 28a and returns to the normal heating operation. Further, even when the temperature of the hot water heated by the condensate heat exchanger 23 detected by the outlet temperature sensor 23c becomes lower than the target temperature range, the defrosting on-off valve 28a is closed to return to the normal heating operation. .. In this way, since the amount of heat supplied is adjusted by opening and closing the defrosting on-off valve 28a while the compressor 22 is operating, it is possible to avoid intermittent operation of the compressor 22. The defrosting on-off valve 28a may be closed after opening the defrosting on-off valve 28a for a predetermined period (for example, 10 minutes).

The operation and effect of the heat pump heat source machine 2 of the present invention will be described.
In the heating operation, the heat pump heat source machine 2 controls the operating rotation speed of the compressor 22 and the opening degree of the expansion valve 24 in order to keep the hot water within the target temperature range. When the amount of heat required for heating hot water is low and the load is low, the defrosting on-off valve 28a is opened to allow a part of the high-temperature refrigerant compressed by the compressor 22 to flow through the refrigerant bypass passage 28, and the condensed heat exchanger 23 is used. Reduces the amount of heat supplied to the hot water. Therefore, in order to reduce the amount of heat supplied, the amount of heat supplied can be further reduced while the compressor 22 operates at the lower limit rotation speed, and intermittent operation of the compressor 22 can be avoided to suppress a decrease in energy efficiency. Further, it is possible to avoid intermittent operation of the compressor 22 to suppress the generation of vibration to suppress noise, and to reduce the stress applied to the piping or the like to maintain the durability of the heat pump heat source machine 2.

If the temperature of the hot water heated while the defrosting on-off valve 28a is open drops below the target temperature range, the defrosting on-off valve 28a is closed to increase the amount of refrigerant introduced into the condensed heat exchanger 23. The amount of heat supplied to the hot water can be increased to heat the hot water to a temperature within the target temperature range.

Further, when the temperature of the refrigerant discharged from the compressor 22 begins to drop while the defrosting on-off valve 28a is open, the blower 25a is stopped to suppress the heat dissipation of the refrigerant in the evaporation heat exchanger 25. It is possible to suppress a decrease in energy efficiency of the heat pump heat source machine 2. Moreover, if the temperature of the refrigerant discharged from the compressor 22 becomes lower than the heating temperature while the defrosting on-off valve 28a is open, the defrosting on-off valve 28a is closed, so that the refrigerant is brought to the heating temperature. It can be heated and introduced into the condensate heat exchanger 23 to maintain the hot water at a temperature within the target temperature range.

Further, since the hot water water heated by the heat pump heat source machine 2 is supplied to the hot water storage tank 5 of the hot water storage hot water supply heating device 3, the hot water water heated by the heat pump heat source machine 2 can be used for heating and also for hot water supply. Therefore, if hot water is supplied while the defrosting on-off valve 28a is opened to reduce the amount of heat supplied to the hot water, the defrosting on-off valve 28a is closed and supplied to the hot water. Since the amount of heat generated can be increased, the amount of heat supplied to the hot water can be increased faster than in the case where the compressor 22 performs intermittent operation.

1 Hot water storage heating system 2 Heat pump heat source machine 3 Hot water storage hot water heating device 4 Heating terminal 5 Hot water storage tank 8 Heating heat exchanger 13 Heating circuit 15 Hot water circulation passage 16 Control unit 21 Auxiliary control unit 22 Compressor 23 Condensation heat exchanger 23a Heat Exchange passage 23c Outlet temperature sensor 24 Expansion valve 25 Evaporation heat exchanger 25a Blower 27 Refrigerator circuit 28 Refrigerator bypass passage 28a Defrosting on-off valve 29 Refrigerator temperature sensor 31 Hot water supply passage 33 Auxiliary heating passage 34 Auxiliary heat source machine Hot water passage 36 Circulation pump 39 pressure feed pump

Claims (4)

A refrigerant circuit connecting the compressor, the condensate heat exchanger, the expansion means, and the evaporation heat exchanger, a bypass passage provided in the refrigerant circuit so as to bypass the condensate heat exchanger and the expansion means, and the bypass. A heat pump heat source machine equipped with an on-off valve that can open and close the passage and a blower that blows air to the evaporation heat exchanger.
In the condensed heat exchanger, the temperature of the hot water is within the predetermined target temperature range by heat exchange between the refrigerant heated to the predetermined heating temperature and the hot water for heating the heating heat medium supplied to the heating terminal. In the heat pump heat source machine that controls the rotation speed of the compressor and the opening degree of the expansion means.
When the compressor is operating at the lower limit rotation speed set to open the pre-SL-off valve if the hot water temperature becomes a temperature higher than the target temperature range, said during opening of the on-off valve A heat pump heat source machine characterized in that the operation of the blower is stopped when the temperature of the refrigerant discharged from the compressor begins to drop. The heat pump heat source machine according to claim 1, wherein when the temperature of hot water becomes lower than the target temperature range while the on-off valve is open, the on-off valve is closed. The heat pump according to claim 1 or 2, wherein when the temperature of the refrigerant discharged from the compressor becomes lower than the heating temperature while the on-off valve is open, the on-off valve is closed. Heat source machine. A hot water storage tank for storing hot water, a hot water supply passage for adjusting the hot water in the hot water storage tank to a set temperature for hot water supply, and a heat exchanger for heating that exchanges heat between the hot water in the hot water storage tank and the heating heat medium. The heat pump heat source machine according to any one of claims 1 to 3, wherein heated hot water is supplied to the hot water storage tank of the hot water storage hot water supply / heating device.

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