JP2019039596A - Heat pump heat source machine - Google Patents

Abstract

To provide a heat pump heat source machine capable of suppressing reduction of energy efficiency by avoiding an intermittent operation of a compressor under a low load during a heating operation.SOLUTION: A heat pump heat source device comprises: a coolant circuit connecting a compressor, a condensation heat exchanger, expansion means and an evaporation heat exchanger; a bypass passage provided in the coolant circuit so as to bypass the condensation heat exchanger and the expansion means; an on-off valve capable of opening/closing the bypass passage; and an air blower which blows air to the evaporation heat exchanger. A coolant which is heated to a predetermined heating temperature is heat-exchanged with hot water for heating a heating medium which is supplied to a heating terminal, by the condensation heat exchanger. Therefore, a rotation speed of the compressor and an aperture of the expansion means are controlled in such a manner that a temperature of the hot water is settled within a predetermined target temperature range. In a case where the temperature of the hot water becomes higher than the target temperature range while the compressor is being actuated at a preset lower limit rotation speed, the on-off valve can be opened.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a heat pump heat source device that supplies heated hot water to a hot water storage hot water supply / heating device.

  Conventionally, a hot water storage / heating system that uses hot water heated by the heating operation of the heat pump heat source machine to perform heating operation, stores hot water heated by the heating operation in a hot water storage tank, and supplies hot water at a hot water set temperature is widely used. Has been. During the heating operation, in the heating heat exchanger of the hot water storage hot water supply / heating device, the heating heat medium is heated to the required heating 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 the heating operation, the amount of heat required for heating is large in order to warm the 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 unit decreases the operating heat speed of the compressor that compresses the refrigerant, and adjusts the opening degree of the expansion valve, which is an expansion unit of the refrigerant, to decrease the amount of supplied heat.

  Decreasing the operating speed of the compressor will increase the vibration of the compressor, which may increase the stress and noise applied to the piping connected to the compressor, so a lower limit is set in advance for the operating speed. Has been. Therefore, the heat pump heat source machine, for example, stops the compressor at a low load such that the required heat quantity is lower than the supply heat quantity when operating at the lower limit value of the operating rotational speed, and the heating heat medium heated by the heating heat exchanger When the temperature is lower than the heating required temperature, the intermittent operation for restarting the operation of the compressor is performed.

  By the way, the heat pump heat source device uses a low-temperature refrigerant expanded by an expansion valve to generate high-temperature refrigerant compressed by the compressor when the frost is generated in the evaporative heat exchanger and heat exchange with air is prevented. It is comprised so that the defrost operation which distribute | circulates to an evaporative heat exchanger through the provided channel | path may be performed. Also, as in Patent Document 1, in a refrigeration system that uses a heat pump, the retention of oil in the refrigeration heat exchanger that occurs when the operating speed of the compressor is low, opens and closes the refrigerant compressed by the compressor. There is known a technique for solving this problem by periodically circulating the refrigerant into a heat exchanger for refrigeration through a passage provided with a valve.

JP 2012-102919 A

  As shown in FIG. 4, the operation of the compressor takes some time from the start of operation at time t1 to time t2 when the refrigerant temperature is stabilized, and the energy efficiency of the heat pump heat source unit is low during that time. Therefore, the energy efficiency of the heat pump heat source machine is reduced due to the intermittent operation of the compressor. In addition, intermittent operation increases the chance of occurrence of compressor vibration, which increases noise and may impair the durability of the heat pump heat source device.

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

  The invention of claim 1 is provided in the refrigerant circuit so as to bypass the compressor, the condensing heat exchanger, the expansion means, and the evaporating heat exchanger, and the condensing heat exchanger and the expansion means. A heat pump heat source device comprising a bypass passage, an on-off valve capable of opening and closing the bypass passage, and a blower for blowing air to the evaporative heat exchanger, wherein the refrigerant is heated to a predetermined heating temperature by the condensation heat exchanger The number of rotations of the compressor and the opening degree of the expansion means are controlled so that the temperature of the hot water falls within a predetermined target temperature range by exchanging heat with hot water for heating the heating medium supplied to the heating terminal. In the heat pump heat source machine, when the temperature of the hot water is higher than the target temperature range when the compressor is operating at the set lower limit rotation speed, the on-off valve is opened. It is said.

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

  The invention of claim 2 is characterized in that, in the invention of claim 1, when the temperature of the 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 falls below the lower limit temperature of the target temperature range, the bypass passage is closed, the refrigerant flowing through the condensation heat exchanger is increased, and the amount of heat supplied to the hot water is increased to increase the target temperature range. Hot water can be heated to the internal temperature.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, when the temperature of the refrigerant discharged from the compressor starts to decrease while the on-off valve is open, the operation of the blower is stopped. It is characterized by.

  With the above configuration, it is possible to suppress the heat dissipation of the refrigerant in the evaporative heat exchanger and suppress the decrease in energy efficiency of the heat pump heat source unit.

  The invention of claim 4 is the invention of any one of claims 1 to 3, wherein 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.

  By the said structure, the refrigerant | coolant supplied to a condensation heat exchanger can be heated to heating temperature, and hot water can be maintained at the temperature within a target temperature range.

  The invention of claim 5 is the invention of any one of claims 1 to 4, wherein 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 hot water supply set temperature and supplying hot water, Heated hot water is supplied to the hot water storage tank of a hot water storage hot water supply / heating device provided with a heat exchanger for heating that performs heat exchange between hot water in the hot water storage tank and the heating heat medium.

  With the above configuration, hot water heated by the heat pump heat source machine can be used for heating and hot water supply. Therefore, in order to reduce the amount of heat supplied to the hot water, when the hot water supply is used when the on-off valve is opened to perform heating operation, the on-off valve is closed to increase the amount of heat supplied to the condensation heat exchanger. Therefore, the amount of heat supplied to the hot water can be increased quickly.

  According to the present invention, since the intermittent operation of the compressor can be avoided at the time of low load in the heating operation, it is possible to suppress a decrease in energy efficiency of the heat pump heat source device.

It is a figure which shows the whole structure of the hot water storage hot-water supply heating apparatus which concerns on the Example 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, modes for carrying out the present invention will be described based on examples.

Initially, the whole structure of the hot water storage hot-water supply heating system 1 is demonstrated based on FIGS. 1-3.
The hot water storage and hot water heating system 1 includes a heat pump heat source device 2, a hot water storage hot water supply and heating device 3, and a heating terminal 4. Is connected to the hot water storage hot water heater 3. Hot water circulates between the hot water storage hot water supply / heating device 3 and the heat pump heat source machine 2 through the hot water circulation passage 15. Further, the 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 device 2 has a refrigerant circuit 27 in which a compressor 22, a condensation heat exchanger 23, an expansion valve 24 (expansion means), and an evaporative heat exchanger 25 are connected in an outer case 20 by a refrigerant pipe 26. A refrigerant bypass passage 28 (bypass passage) branched from the refrigerant pipe 26 between the compressor 22 and the condensation heat exchanger 23 includes a defrosting on-off valve 28a (open / close valve) capable of opening and closing the refrigerant bypass passage 28, and is expanded. A refrigerant pipe 26 between the valve 24 and the evaporation heat exchanger 25 is connected. A refrigerant temperature sensor 29 that detects the temperature of the refrigerant discharged from the compressor 22 is disposed in the refrigerant pipe 26 between the compressor 22 and the condensation heat exchanger 23. In the heat exchange passage 23 a of the condensation heat exchanger 23 connected to the hot water circulation passage 15, an inlet temperature sensor 23 b for detecting the temperature of hot water on the inlet side of the condensation heat exchanger 23 and a temperature of hot water on the outlet side are detected. An outlet temperature sensor 23c is disposed.

  The heat pump heat source unit 2 controls the heating operation and the like by an auxiliary control unit 21 electrically connected to a control unit 16 of the hot water storage 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 evaporative heat exchanger 25 is driven, and the opening degree of the expansion valve 24 is adjusted to be enclosed in the refrigerant pipe 26. Circulate the refrigerant.

  The high-temperature refrigerant compressed and heated in the compressor 22 by the heating operation is introduced into the condensation heat exchanger 23. In the condensation heat exchanger 23, heat exchange is performed between the high-temperature refrigerant and hot water flowing through the heat exchange passage 23a connected to the hot water circulation passage 15 to heat the hot water. The refrigerant, which has been cooled by heat exchange and partially liquefied, expands at the expansion valve 24, further cools down, and is introduced into the evaporative heat exchanger 25. In the evaporative heat exchanger 25, the refrigerant absorbs heat from the outside air and vaporizes, 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 may be generated in the evaporative heat exchanger 25 that prevents heat exchange between the atmosphere and the refrigerant. 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 using the refrigerant that has been compressed by the compressor 22 and has reached 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 of hot water into the bathtub, reheating of hot water in the bathtub, and supply of a heating heat medium to the heating terminal 4 such as a floor heating panel. This hot water storage hot water supply / heating device 3 includes a hot water storage tank 5, an auxiliary heat source device 6, a heat exchanger 7 for reheating, a heat exchanger 8 for heating, a water supply passage 9, a hot water supply passage 10, a hot water filling passage 11, a bath retreat circuit. 12, a heating circuit 13, a heat exchanger forward passage 14 a, a heat exchanger return passage 14 b, a hot water circulation passage 15, a control unit 16, a hot water mixing valve 35, etc. are provided in the exterior case 30, and various settings of the hot water storage hot water supply / heating device 3 are provided. An operation terminal 38 that is electrically connected to the control unit 16 is provided so that equal operations are possible.

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

  The auxiliary heat source unit 6 is a known gas water heater that incorporates a burner, a heat exchanger, and the like. This auxiliary heat source unit 6 is controlled by the control unit 16 so as to heat and supply hot water only in special cases such as when hot water at the hot water supply set temperature cannot be supplied with hot water in the hot water storage tank 5.

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

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

  In the hot and cold water mixing valve 35 capable of adjusting the mixing ratio so that hot water can be supplied at a hot water supply set temperature, hot hot water flowing through the hot water supply passage 32 and hot water supplied from the water supply bypass passage 17 are mixed, and the hot water supply passage 31 is mixed. 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 as to be hot water filled. The hot water supply passage 31 is provided with a hot water supply flow rate sensor 31a and a hot water supply flow rate adjustment valve 31b, and the hot water supply passage 32 is provided with a hot water temperature sensor 32a for detecting the temperature of hot water in the hot water supply passage 32.

  The auxiliary heating passage 33 is provided with a three-way valve 33a, a pressure feed pump 39, and the like. The auxiliary heat source machine hot water passage 34 is connected to the hot water passage 32 via a flow rate adjusting valve 34a. The heat exchanger outgoing passage 14a branched from the auxiliary heat source machine hot water outlet passage 34 on the upstream side of the flow rate adjusting valve 34a is connected to the heat exchanger 7 for heating and the heat exchanger 8 for heating so that hot water can be supplied.

Next, the hot water circulation passage 15 will be described.
The hot water circulation passage 15 includes an upstream circulation passage portion 15a that connects the lower portion of the hot water storage tank 5 and the heat exchange passage portion 23a of the heat pump heat source unit 2, and a downstream circulation passage portion 15b that connects the heat exchange passage portion 23a and the upper portion of the hot water storage tank 5. It has. The upstream circulation passage portion 15 a includes 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, and the circulation switching valve 37 is switched to the circulation bypass passage portion 15c side so that the heat pump heat source machine 2 The hot water heated in is reheatable by the heat pump heat source unit 2.

Next, the control unit 16 will be described.
The control unit 16 receives the heating request signal of the heating terminal 4, and the hot water mixing valve 35, the circulation pump 36, and the pressure pump based on the detection signals by the sensors disposed in the hot water storage temperature sensors 5a to 5d and the like. The pump 39 and the like are driven, and the heat pump heat source unit 2 is heated through 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 warm air heater, and includes a control unit (not shown) connected to the control unit 16 so as to be communicable. During the heating operation, the heating request temperature preset as the set temperature of the heating heat medium during the heating operation is transmitted from the control unit of the heating terminal 4 to the control unit 16. Although the heating required temperature varies depending on the type of the heating terminal 4, it is set to a temperature of 40 ° C to 60 ° C, for example.

Next, hot water storage operation will be described.
In the hot water storage operation, hot water corresponding to the amount of heat necessary for hot water supply or hot water filling of the bathtub is stored in the hot water storage tank 5 by the heating operation of the heat pump heat source device 2. Specifically, the circulating 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 unit 2, and the hot 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 tap or the like is opened and the hot water flow rate sensor 31a detects a predetermined flow rate, the control unit 16 supplies the hot water temperature of the hot water flowing through the hot water passage 31 based on, for example, the temperature of the hot water in the hot water passage 32 and the temperature of the hot water. Adjusts the mixing ratio of the hot and cold water mixing valve 35 so as to be the hot water supply set temperature set by the operation terminal 38. When it is difficult to adjust the hot water stored in the hot water storage tank 5 to the hot water supply set temperature by mixing with clean water, the hot water heated by operating the auxiliary heat source unit 6 and the pressure feed pump 39 is supplied to the hot water mixing valve. 35 to supply hot water.

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

Next, the heating operation will be described.
In the heating operation, the heating heat medium 8 is heated by heat exchange between the hot water heated by the heating operation of the heat pump heat source unit 2 and the heating heat medium circulated in the heating circuit 13 in the heating heat exchanger 8. At this time, the heating on-off valve 8a is opened, the pressure 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 device 2 is heated from the heat exchanger forward passage 14a. It introduces into the heat exchanger 8. The hot water introduced into the heating heat exchanger 8 from the heat exchanger going-out passage 14 a flows through the heat exchanger return passage 14 b and is supplied to the lower part of the hot water storage tank 5.

  The control unit 16 heats the heating medium in the heating heat exchanger 8 to the heating medium temperature transmitted from the heating terminal 4, so that the temperature of the hot water introduced into the heating heat exchanger 8, that is, the heat pump heat source machine 2. Control is performed so that the temperature of the hot and cold water to be heated is maintained within a predetermined target temperature range. Therefore, the auxiliary control unit 21 controls the rotational speed of the compressor 22, the opening degree of the expansion valve 24, and the rotational speed of the blower 25 a so as to maintain the refrigerant temperature discharged from the compressor 22 at a predetermined heating temperature. To do. For example, when the heating required temperature is 40 ° C., the target temperature range is set to 50 ° C. to 60 ° C., for example, 10 ° C. to 20 ° C. higher than the heating required temperature, and the heating temperature is 60 ° C. to 10 ° C. higher than the target temperature range, for example. Set to 70 ° C. In addition, these temperature shows an example and can be changed suitably.

  Hot water introduced into the condensation 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 having the heating temperature in the condensation heat exchanger 23. . The heated hot water is stored in the upper part of the hot water storage tank 5, and is circulated in the order of the hot water discharge passage 32, the auxiliary heating passage 33, the auxiliary heat source unit 6, the auxiliary heat source outlet hot water passage 34, and the heat exchanger outgoing passage 14 a by the operation of the pressure feed pump 39. Then, it is introduced into the heat exchanger 8 for heating. At this time, hot water is not heated by the auxiliary heat source unit 6. The heating heat medium is heated to the required heating temperature by heat exchange between the hot water introduced in the heating heat exchanger 8 and the heating heat medium, and the hot water after the heat exchange is downstream of 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 through the water supply passage 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 cooled, the amount of heat released from 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 exchanged with the heating heat medium becomes low temperature and is introduced into the condensation 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 exchanged with the heating heat medium is introduced into the condensation heat exchanger 23 while the temperature is high. Therefore, the auxiliary control unit 21 adjusts the opening degree of the expansion valve 24 by reducing the rotational speed of the compressor 22 so as to reduce the amount of heat supplied for heating the hot water with the condensation heat exchanger 23.

  At a low load when the amount of heat required for heating the hot water is lower than the amount of heat supplied when the rotation speed of the compressor 22 is lowered to a preset lower limit rotation speed, the temperature of the hot water heated by the condensation heat exchanger 23 is The temperature is higher than the target temperature range. At this time, the auxiliary control unit 21 opens the defrosting on-off valve 28 a and causes a part of the refrigerant compressed by the compressor 22 to flow through the refrigerant bypass passage 28. Thereby, the refrigerant | coolant supplied to the condensation heat exchanger 23 can be reduced, and supply heat amount can be reduced, without stopping the compressor 22. FIG.

  When the defrosting on-off valve 28 a is opened, the high-temperature refrigerant compressed by the compressor 22 is mixed with the low-temperature refrigerant flowing 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 starts to decrease, the auxiliary control unit 21 stops driving the blower 25a and suppresses the heat radiation of the refrigerant in the evaporative heat exchanger 25. As a result, it is possible to suppress heat dissipation to the atmosphere of the heated refrigerant and to 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 condensation 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. In addition, even when the temperature of the hot water heated by the condensation 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. . Thus, since the supply heat quantity is adjusted by opening and closing the defrosting on-off valve 28a while the compressor 22 is operated, intermittent operation of the compressor 22 can be avoided. In addition, after opening the defrosting on-off valve 28a for a predetermined period (for example, 10 minutes), you may comprise so that the defrosting on-off valve 28a may be closed.

The operation and effect of the heat pump heat source apparatus 2 of the present invention will be described.
In the heating operation, the heat pump heat source device 2 controls the operating rotational speed of the compressor 22 and the opening degree of the expansion valve 24 in order to maintain the hot water in the target temperature range. At a low load when the amount of heat required for heating the hot water is low, the defrosting on-off valve 28a is opened, and a part of the high-temperature refrigerant compressed by the compressor 22 is circulated through the refrigerant bypass passage 28, thereby condensing the heat exchanger 23. The amount of heat supplied to the hot water is reduced. 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. Furthermore, intermittent operation of the compressor 22 can be avoided to suppress generation of vibration and noise, and stress applied to the piping can be reduced to maintain the durability of the heat pump heat source device 2.

  Further, when the temperature of the hot water heated while the defrosting on / off valve 28a is opened falls below the target temperature range, the refrigerant introduced into the condensation heat exchanger 23 is increased by closing the defrosting on / off valve 28a. The amount of heat supplied to the hot water is increased, and the hot water can be heated to a temperature within the target temperature range.

  In addition, when the temperature of the refrigerant discharged from the compressor 22 starts to decrease when the defrosting on-off valve 28a is opened, the blower 25a is stopped, and the heat dissipation of the refrigerant is suppressed in the evaporative heat exchanger 25, A decrease in energy efficiency of the heat pump heat source unit 2 can be suppressed. In addition, when 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 heat and introduce | transduce into the condensation heat exchanger 23, and can maintain hot water at the temperature within a target temperature range.

  Moreover, since the hot water heated by the heat pump heat source unit 2 is supplied to the hot water storage tank 5 of the hot water storage hot water supply / heating device 3, the hot water heated by the heat pump heat source unit 2 can be used for heating and hot water supply. Therefore, in order to reduce the amount of heat supplied to the hot water, when the hot water supply is used when the defrosting on / off valve 28a is opened and heating operation is performed, the defrosting on / off valve 28a is closed and supplied to the hot water. Since the amount of heat to be increased can be increased, the amount of heat supplied to the hot water can be increased faster than when the compressor 22 performs intermittent operation.

DESCRIPTION OF SYMBOLS 1 Hot water storage hot water heating system 2 Heat pump heat source machine 3 Hot water storage hot water heating apparatus 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 Condensing heat exchanger 23a Heat Exchange passage 23c Outlet temperature sensor 24 Expansion valve 25 Evaporation heat exchanger 25a Blower 27 Refrigerant circuit 28 Refrigerant bypass passage 28a Defrosting on-off valve 29 Refrigerant temperature sensor 31 Hot water supply passage 33 Auxiliary heating passage 34 Auxiliary heat source machine outlet passage 36 Circulation pump 39 Pressure feed pump

Claims (5)

A refrigerant circuit connecting the compressor, the condensation heat exchanger, the expansion means, and the evaporative heat exchanger; a bypass passage provided in the refrigerant circuit so as to bypass the condensation heat exchanger and the expansion means; and the bypass A heat pump heat source device comprising an on-off valve capable of opening and closing a passage and a blower for blowing air to the evaporative heat exchanger,
By the heat exchange between the refrigerant heated to a predetermined heating temperature and the hot water for heating the heating medium supplied to the heating terminal in the condensation heat exchanger, the temperature of the hot water is within a predetermined target temperature range. In a heat pump heat source machine that controls the rotation speed of the compressor and the opening of the expansion means,
When the compressor is operating at a set lower limit rotational speed, when the temperature of hot water becomes higher than the target temperature range, the on-off valve is opened.   The heat pump heat source apparatus according to claim 1, wherein when the temperature of the hot water becomes lower than the target temperature range while the on-off valve is open, the on-off valve is closed.   3. The heat pump heat source device according to claim 1, wherein when the temperature of the refrigerant discharged from the compressor starts to decrease while the on-off valve is opened, the operation of the blower is stopped.   The open / close valve is closed when the temperature of the refrigerant discharged from the compressor becomes lower than the heating temperature while the open / close valve is open. The heat pump heat source machine according to item.   A hot water storage tank for storing hot water, a hot water supply passage for supplying hot water by adjusting the hot water in the hot water storage tank to a set hot water temperature, and a heat exchanger for heating that exchanges heat between the hot water in the hot water storage tank and the heating heat medium Heated hot water is supplied to the hot water storage tank of a hot water storage hot water supply / heater device comprising: a heat pump heat source device according to any one of claims 1 to 4.