JP2011052850A - Heat pump type warm water heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat pump type warm water heating device capable of suppressing a rise of a refrigerant discharge temperature, and not degrading reliability. <P>SOLUTION: In this heat pump type warm water heating device having a refrigerating cycle 6 constituted by successively and annularly connecting a compressor 1 for compressing a refrigerant, a water-refrigerant heat exchanger 2 exchanging heat between a refrigerant of high temperature and water, a pressure reducing device 3 for reducing a pressure of the refrigerant, and an evaporator 4 for exchanging heat between the refrigerant and an air, and a warm water pump 9 for distributing the water of high temperature produced by the water-refrigerant heat exchanger 2 to a heating terminal 8, a refrigerant flow channel in the evaporator 4 is branched into a plurality of flow channels, and a heat exchange amount between the air and the refrigerant in at least one of a plurality of refrigerant flow channels in the evaporator 4 is less than the heat exchange amounts between the air and the refrigerant in the other refrigerant flow channels in the evaporator 4. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a heat pump type hot water heating apparatus that performs heating with hot water generated using a heat pump.

  Conventionally, heating equipment using combustion fuels such as oil and gas as the heat source has occupied the majority, but in recent years the heating market using heat pump technology has expanded rapidly. Also, some conventional air conditioners can use both cooling and heating by utilizing heat pump technology.

  However, the conventional air conditioner alone has a problem that the feet are difficult to warm during heating, and a hot water heater using heat pump technology has been developed to solve the problem (see, for example, Patent Document 1). In the hot water heating apparatus described in Patent Document 1, heat exchange is performed between a high-temperature refrigerant and hot water, and the hot water heated by heat exchange is sent to a heating terminal such as a floor heating panel to perform heating.

  FIG. 8 is a configuration diagram of a conventional heat pump hot water heater. As shown in FIG. 8, the conventional heat pump hot water heating apparatus has a compressor 101, a refrigerant flow path of a water / refrigerant heat exchanger 102, a decompression device 103, and an evaporator 104 that are sequentially annularly formed by a refrigerant pipe 105. The refrigeration cycle 106 was connected to form a heating cycle by sequentially connecting the water flow path of the water-refrigerant heat exchanger 102, the hot water heating pump 109, and the heating terminal 108 in an annular manner. Then, when the heating operation is started, the operation of the refrigeration cycle is started, and the hot water circulation pump 109 is driven to send the hot water heated by the water / refrigerant heat exchanger 102 to the heating terminal 108, thereby heating the floor heating panel or other heating terminal. The room is heated at 108.

  In the heat pump type hot water heating apparatus configured as described above, since the hot water heating pump is always driven during the hot water heating operation, heat exchange in the water refrigerant heat exchanger is always performed.

JP 2006-266587 A

  However, if the heating operation is continued for a long time, the heating terminal side will also be sufficiently warmed, so the sent hot water will not radiate much heat at the heating terminal, and the hot water will return to the water-refrigerant heat exchanger without the temperature dropping too much. Will come. And when high-temperature water with little temperature drop returns to the water-refrigerant heat exchanger, compared to when low-temperature water returns, the high-pressure side of the refrigerant goes up, and as a result, the refrigerant discharge temperature rises. .

  Furthermore, when the refrigerant state in the water-refrigerant heat exchanger is accompanied by a condensation change from gas to liquid, there is a two-phase region that does not involve a temperature change, so there is a region where the temperature difference between the water to be heat-exchanged and the refrigerant is small. Since this occurs and the heat exchange capacity decreases, the pressure of the refrigerant increases, and as a result, the discharge temperature of the refrigerant increases.

Thus, in a heat pump hot water heating apparatus having a refrigeration cycle in which water and refrigerant that need to have a desired temperature exchange heat, the high pressure of the refrigerant rises, and the discharge temperature rises. However, there has been a problem that the deterioration of the compressor mechanism is reduced due to the progress of material deterioration and oil deterioration.

  In a refrigeration cycle in which heat is exchanged between the refrigerant and air used in conventional air conditioners, the temperature change of the air when the refrigerant dissipates heat to a large amount of air in the space is small, and the blowing temperature is set to the desired temperature. As a result, the refrigerant is not easily affected by the temperature change of the air, and thus the above-described problem recognition has not been made.

  On the other hand, in a refrigeration cycle in which heat is exchanged between water and refrigerant, water absorbs the amount of heat radiated by the refrigerant in the water / refrigerant heat exchanger, so that the temperature of the water changes greatly. The above problem is a unique problem that is found for the first time by using a refrigeration cycle in which heat is exchanged between water and refrigerant, because it is easily affected and, unlike air conditioners, it is necessary to use hot water at a desired temperature. is there.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a heat pump hot water heating apparatus that suppresses an increase in refrigerant discharge temperature and does not impair reliability.

  In order to solve the conventional problems, a heat pump type hot water heating apparatus of the present invention includes a compressor that compresses a refrigerant, a water refrigerant heat exchanger that exchanges heat between the high-temperature refrigerant and water, a decompression apparatus that depressurizes the refrigerant, In a heat pump type hot water heating apparatus comprising a refrigeration cycle in which evaporators that perform heat exchange between refrigerant and air are sequentially connected in an annular manner, and a hot water pump that sends high temperature water generated by a water refrigerant heat exchanger to a heating terminal The refrigerant flow path in the evaporator is divided into a plurality of branches, and the heat exchange amount between the air and the refrigerant in at least one of the plurality of refrigerant flow paths in the evaporator is different from that in the evaporator. By reducing the amount of heat exchange between the air and the refrigerant in the refrigerant flow path, the degree of superheat after the refrigerant merges at the outlet of the evaporator is reduced, thereby lowering the intake temperature to the compressor. The result, the compressor Can be lowered coolant temperature discharged al, it is possible to prevent compromising the reliability of the compressor.

  The heat pump type hot water heating apparatus of the present invention includes a compressor that compresses a refrigerant, a water refrigerant heat exchanger that exchanges heat between the high-temperature refrigerant and water, a decompression device that depressurizes the refrigerant, and refrigerant and air exchange heat. A heat pump type equipped with a refrigeration cycle in which the evaporators to be sequentially connected in a ring, a hot water storage tank for storing the high temperature water generated by the water refrigerant heat exchanger, and a hot water pump for sending the high temperature water in the hot water storage tank to the heating terminal In the hot water heater, the refrigerant flow path in the evaporator is divided into a plurality of branches, and the amount of heat exchange between the air and the refrigerant in at least one of the refrigerant flow paths in the evaporator is evaporated. By reducing the amount of heat exchange between the air and the refrigerant in the other refrigerant flow paths in the evaporator, the degree of superheat after the refrigerant merges at the outlet of the evaporator can be reduced. Lower the inhalation temperature, As a result, the refrigerant temperature discharged from the compressor can be lowered, it is possible to prevent compromising the reliability of the compressor.

  The present invention can provide a heat pump hot water heating apparatus that suppresses an increase in the discharge temperature of the refrigerant and does not impair reliability.

The block diagram of the heat pump type hot water heating apparatus in Embodiment 1 of this invention The block diagram of the other heat pump type hot water heating apparatus in Embodiment 1 The block diagram of the other heat pump type hot water heating apparatus in Embodiment 1 Configuration diagram of the evaporator in the first embodiment Mollier diagram of the refrigeration cycle in the first embodiment Configuration diagram of another evaporator in the first embodiment Configuration diagram of another evaporator in the first embodiment Configuration diagram of conventional heat pump hot water heater

  The heat pump type hot water heating device of the first invention includes a compressor for compressing refrigerant, a water refrigerant heat exchanger for exchanging heat between the high-temperature refrigerant and water, a decompression device for depressurizing the refrigerant, and heat exchange between the refrigerant and air. In a heat pump hot water heating apparatus comprising a refrigeration cycle in which evaporators to be sequentially connected in a ring form and a hot water pump for sending high temperature water generated by a water refrigerant heat exchanger to a heating terminal, a refrigerant flow path in the evaporator The heat exchange amount between the air and the refrigerant in at least one of the plurality of refrigerant channels in the evaporator is such that the air and the refrigerant in the other refrigerant channels in the evaporator. By reducing the amount of heat exchange with the refrigerant, the degree of superheat after the refrigerant merges at the outlet of the evaporator is reduced, thereby lowering the intake temperature to the compressor, and as a result, discharging from the compressor. Lower the refrigerant temperature It can, it is possible to prevent compromising the reliability of the compressor.

  The heat pump type hot water heating device of the second invention includes a compressor that compresses a refrigerant, a water refrigerant heat exchanger that exchanges heat between the high-temperature refrigerant and water, a decompression device that depressurizes the refrigerant, and heat exchange between the refrigerant and air. A heat pump type equipped with a refrigeration cycle in which the evaporators to be sequentially connected in a ring, a hot water storage tank for storing the high temperature water generated by the water refrigerant heat exchanger, and a hot water pump for sending the high temperature water in the hot water storage tank to the heating terminal In the hot water heater, the refrigerant flow path in the evaporator is divided into a plurality of branches, and the amount of heat exchange between the air and the refrigerant in at least one of the refrigerant flow paths in the evaporator is evaporated. By reducing the amount of heat exchange between the air and the refrigerant in the other refrigerant flow paths in the evaporator, the degree of superheat after the refrigerant merges at the outlet of the evaporator can be reduced. Reduce the suction temperature Result, the refrigerant temperature discharged from the compressor can be lowered, it is possible to prevent compromising the reliability of the compressor.

  The heat pump type hot water heating device of the third invention is the first or second invention, in particular, the pipe length of at least one refrigerant channel among the plurality of refrigerant channels in the evaporator and the other refrigerant flow in the evaporator. By making it shorter than the pipe length of the passage, the heat transfer area is reduced by reducing the heat transfer area of some refrigerant flow paths, reducing the dryness of the refrigerant and reducing the heating degree of the refrigerant after merging. Can be reduced.

  The heat pump type hot water heating device of the fourth invention is the heat pump type hot water heating apparatus of the fourth invention, particularly in the first to third inventions, wherein the heat transfer performance of the piping of at least one refrigerant flow path among the plurality of refrigerant flow paths in the evaporator is Lowering the heat transfer performance of the refrigerant flow pipes reduces the heat transfer capacity of some of the refrigerant flow paths, reducing the dryness of the refrigerant and reducing the heat of the refrigerant after merging can do.

  The heat pump type hot water heating apparatus of the fifth invention is the heat pump type hot water heating apparatus of the fifth invention, particularly in the first to fourth inventions, wherein the evaporators are arranged in two front and rear rows, and flow through at least one refrigerant flow path among a plurality of refrigerant flow paths in the evaporator. By making the refrigerant flow and the air flow parallel to each other and making the refrigerant flow and the air flow through the other refrigerant flow paths in the evaporator counter-current, the heat transfer capability in some of the refrigerant flow paths decreases, The degree of dryness can be reduced, and the degree of heating of the refrigerant after merging can be reduced.

  The heat pump type hot water heating apparatus of the sixth invention is the first to fifth inventions, in particular, in the first to fifth inventions, the amount of refrigerant flowing to at least one refrigerant channel among the plurality of refrigerant channels in the evaporator, By making it larger than the amount of refrigerant flowing into the flow path, it is possible to reduce the dryness of the refrigerant in some of the refrigerant flow paths and reduce the degree of heating of the combined refrigerant.

  The heat pump type hot water heating apparatus of the seventh invention is the heat pump unit that houses the compressor, the decompression device, and the evaporator, and the heat exchange unit that houses the water refrigerant heat exchanger, particularly in the first to sixth inventions. Since it is configured as a separate unit and the heat exchange unit is placed indoors, the connection between the indoor and the outdoor is made with refrigerant piping. it can.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a configuration diagram of a heat pump hot water heating apparatus according to Embodiment 1 of the present invention. First, the structure of a heat pump type hot water heating apparatus will be described with reference to FIG. The heat pump type hot water heating apparatus of the present embodiment includes a compressor 1 that compresses refrigerant and discharges high-temperature refrigerant, a water-refrigerant heat exchanger 2 that generates heat by exchanging heat between water and the high-temperature refrigerant, It has a refrigeration cycle 6 in which a decompression device 3 for decompressing the refrigerant and an evaporator 4 for exchanging heat between air and the refrigerant are sequentially connected in an annular manner by a refrigerant pipe 5. Further, it has a blower fan 7 for sending air to the evaporator 4. Note that R410A is used as the refrigerant, but other fluorocarbon refrigerants can also be used. The compressor 1 is a hermetically sealed type, and a motor is disposed on the high-pressure side, and a rare earth magnet is used for the motor.

  Moreover, the heating terminal 8 (for example, a floor heating panel, a radiation panel, etc.) which heats a living room is provided, and the inside of the heating terminal 8 is heated by flowing the high temperature water produced | generated with the water-refrigerant heat exchanger 2 inside. To do. Therefore, water is configured to circulate between the heating terminal 8 and the water refrigerant heat exchanger 2, and a hot water pump 9 for circulating water is provided.

  And the temperature sensor 13 for detecting the tapping temperature is provided on the hot water outlet side of the water-refrigerant heat exchanger 2, and the temperature detected by the temperature sensor 13 is a set temperature set by a remote control device or the like (not shown). If it approaches, the number of rotations of the compressor 1 is reduced to lower the capacity. In this case, the capacity is reduced, but since the high pressure is determined by the water temperature, the discharge temperature of the compressor 1 hardly decreases with the capacity.

  Moreover, the temperature sensor 14 which detects the temperature of the discharge refrigerant | coolant of the compressor 1 is provided, and the temperature detected by the temperature sensor 14 is the optimal discharge temperature previously linked | related with respect to the setting temperature set with the remote control apparatus etc. Thus, the decompression device 3 is controlled.

  In FIG. 1, the refrigeration cycle 6 is housed in the housing of the heat pump unit 10 a and arranged outdoors. Therefore, the indoor and outdoor are connected by water piping, and the refrigeration cycle 6 can be stored in the heat pump unit 10a. The piping connection at the time of installation is only the connection of the water piping, and the workability is high. .

  Moreover, it is good also as a structure of a heat pump type hot water heating apparatus as shown in FIG. As shown in FIG. 2, components other than the water-refrigerant heat exchanger 2 among the functional components constituting the refrigeration cycle are housed in the housing of the heat pump unit 10b, and the water-refrigerant heat exchanger 2 is placed in the housing of the heat exchange unit 10c. The structure accommodated in may be sufficient. In this case, the heat pump unit 10b is arranged outdoors, and the heat exchange unit 10c is arranged indoors, so that the indoors and the outdoors are connected by refrigerant piping. Therefore, even when the outside air temperature is low, such as in winter, the indoor and the outdoor are connected by the refrigerant pipe, so that there is an advantage that the risk of freezing is lower than when the water pipe is connected.

  Moreover, it is good also as a structure of a heat pump type hot water heating apparatus as shown in FIG. In FIG. 3, a hot water storage tank 11 and a boiling pump 12 are provided. Therefore, the water-refrigerant heat exchanger 2 generates high-temperature water stored in the hot water storage tank 11 and sends the high-temperature water stored in the hot water storage tank 11 to the heating terminal 8. Further, the water at the bottom of the hot water storage tank 11 is sent to the water refrigerant heat exchanger 2 by driving the boiling pump 12, and the high temperature water generated by the water refrigerant heat exchanger 2 is returned to the hot water storage tank 11.

  By configuring as shown in FIG. 3, even during the defrosting operation performed when the evaporator 4 is frosted, the hot water stored in the hot water storage tank 11 is sent to the heating terminal 8, High temperature water can be sent stably, and the influence of defrosting operation can be minimized. 2 and 3, the same parts as those in FIG. 1 are described with the same symbols. Further, although the four-way valve is not shown in the refrigeration cycle of FIGS. 1 to 3, the refrigerant discharged from the compressor 1 is supplied to the water refrigerant heat exchanger 2 in order to perform the defrosting operation and the pump down of the evaporator 4. You may provide the four-way valve which switches which of the evaporator 4 sends.

  In the heat pump type hot water heating apparatus configured as described above, the configuration of the evaporator 4 will be described below.

  FIG. 4 is a configuration diagram of the evaporator according to the first embodiment. The evaporator of the present embodiment uses a fin-and-tube heat exchanger, and refrigerant pipes 42a to 42d pass through the inside so as to be orthogonal to a plurality of flat and corrugated fins 41. Heat exchange between air and refrigerant is performed.

  In the first embodiment, the refrigerant flow path in the evaporator 4 is branched into four, the refrigerant pipe 43a connected to the decompression device 3 is connected to the distributor 44, and on the downstream side of the distributor 44. The refrigerant pipes 42a to 42d are distributed to the four flow paths. Further, a merger 45 for connecting the refrigerant tubes 42 a to 42 d to join the refrigerant is arranged on the outlet side of the evaporator 4, and a refrigerant tube 43 b connected to the compressor is arranged on the downstream side of the merger 45. It is connected.

  Of the four flow paths in the evaporator 4, the pipe lengths of the refrigerant flow paths of the refrigerant pipes 42a to 42c and the refrigerant flow path of the refrigerant pipe 42d are different. That is, if the same circulation amount of refrigerant flows through the refrigerant pipes 42a to 42d, the degree of superheat of the refrigerant at the outlet in the refrigerant flow path of the refrigerant pipes 42a to 42c becomes the same, and the refrigerant is overheated at the outlet of the refrigerant pipe 42d. The degree is set to be smaller than the degree of superheat of the refrigerant tubes 42a to 42c.

  FIG. 5 is a Mollier diagram of a refrigeration cycle using the evaporator 4 of the present embodiment. As shown in FIG. 5, in the conventionally used evaporator, the refrigerant pipes 42a to 42d have the same pipe length, so the state of the refrigerant on the downstream side of the merger 45 is located at Ma. Such a refrigerant If it compresses in a state, discharge temperature will rise to the isotherm TH.

  However, when the evaporator as shown in FIG. 4 is used, the pipe length La of the refrigerant pipes 42a to 42c is different from the pipe length Lb of the refrigerant pipe 42d, and there is a relationship of La> Lb. Therefore, the refrigerant state at the outlet of the refrigerant pipes 42a to 42c is Ma, but the refrigerant state at the outlet of the refrigerant pipe 42d is located at Mc. As a result of the merged refrigerants from the respective refrigerant paths, the state of the refrigerant on the downstream side of the confluencer 45 is positioned at Md, and when the refrigerant in the Md state is compressed by the compressor, on the isotherm TL It becomes a state Me located at. At this time, since TL <TH, the temperature of the refrigerant discharged from the compressor 1 is lowered.

As described above, in the evaporator of the present embodiment, the pipe length of at least one refrigerant flow path of the refrigerant flow path of the evaporator 4 is made shorter than the pipe length of other refrigerant flow paths of the evaporator 4. Thus, the heat transfer performance in the refrigerant flow path with the pipe length shortened can be reduced and the degree of superheat of the refrigerant downstream of the merger 45 can be reduced, so the refrigerant temperature discharged from the compressor 1 is reduced. can do.

  Moreover, in this Embodiment, although the four refrigerant | coolant flow paths provided in the evaporator 4 were provided, it is not limited to this. Further, in the present embodiment, the piping length of only one refrigerant channel among the four refrigerant channels is shortened, but the evaporator 4 may be provided with refrigerant channels having different heat exchange amounts. There is no need to limit the number of refrigerant flow paths to be reduced to one (for example, four refrigerant flow paths are provided to shorten the piping length of the two refrigerant flow paths).

  Moreover, you may comprise the structure of the evaporator 4 with the fin and tube type heat exchanger of 2 rows before and behind, as shown in FIG. In this case, the evaporator 4 includes a front evaporator 4a and a rear evaporator 4b. When the blower fan 7 is driven, an air flow is generated from the rear side to the front side.

  Therefore, the refrigerant flow and the air flow that flow through at least one of the plurality of refrigerant channels in the evaporator 4 are set in parallel flow, and the refrigerant flow and the air flow that flow in the other refrigerant channels in the evaporator are set as counterflows. To do. That is, the refrigerant flow paths 42a to 42c enter from the front evaporator 4a and exit from the rear evaporator 4b, and the refrigerant flow path 42d enters from the rear evaporator 4b and exit from the rear evaporator 4b.

  As a result, the refrigerant in the refrigerant flow paths 42a to 42c flows in a direction opposite to the air flow, the refrigerant in the refrigerant flow path 42d flows in a direction parallel to the air flow, and heat exchange in the refrigerant flow paths 42a to 42c. The amount of heat exchange in the refrigerant flow path 42d is smaller than the amount. The degree of superheat at the outlet part of the refrigerant flow path 42d is smaller than the degree of superheat at the outlet part of the refrigerant flow paths 42a to 42c, and the superheat degree of the refrigerant on the downstream side of the merger 45 can be suppressed. The refrigerant temperature discharged from the compressor 1 can also be lowered.

  In addition, although four refrigerant flow paths provided in the evaporator 4 are provided, the present invention is not limited to this. Moreover, although it was set as the parallel flow of only one refrigerant flow path among four refrigerant flow paths, since the refrigerant flow path in which the heat exchange amount differs in the evaporator 4 should just be provided, the refrigerant flow which reduces heat exchange amount There is no need to limit the number of paths to one (for example, four refrigerant channels are provided and the two refrigerant channels are parallel flows).

  Further, as shown in FIG. 7, the evaporator 4 is provided with distribution capillary tubes 46a to 46d to reduce the throttling effect of only the capillary tube 46d, thereby reducing the amount of refrigerant flowing into the refrigerant flow path 42d. The amount of the refrigerant flowing into the flow paths 42a to 42c can be increased. As a result, an increase in the degree of superheat in the refrigerant flow path 42d can be suppressed, and the degree of superheat of the refrigerant on the downstream side of the merger 45 can also be suppressed. Note that only the refrigerant flow path 42d may be provided with no capillary tube.

  In addition, although four refrigerant flow paths provided in the evaporator 4 are provided, the present invention is not limited to this. In addition, although the throttle effect of the capillary tube of only one refrigerant flow path among the four refrigerant flow paths is different, it is only necessary to provide a refrigerant flow path with a different heat exchange amount in the evaporator 4, so that the heat exchange amount can be reduced. It is not necessary to limit the number of refrigerant channels to be lowered to one (for example, four refrigerant channels are provided to make the capillary tubes of the two refrigerant channels have different throttling effects). Further, the flow rate of the refrigerant flowing in the refrigerant flow path 42d may be increased by causing the distribution of the distributor 44 to drift without providing a capillary tube.

As described above, the heat pump hot water heating apparatus of the present invention can be applied to a hot water heating apparatus having a hot water storage tank and a hot water heating apparatus having no hot water storage tank.

DESCRIPTION OF SYMBOLS 1 Compressor 2 Water refrigerant | coolant heat exchanger 3 Pressure reducing device 4 Evaporator 5 Refrigerant piping 6 Refrigeration cycle 7 Blower fan 8 Heating terminal 9 Hot water pump 10a Heat pump unit 10b Heat pump unit 10c Heat exchange unit 11 Hot water storage tank 12 Boiling pump 13 Temperature sensor 14 Temperature sensor 41 Fin 42a-d Refrigerant flow path 43a, b Refrigerant pipe 44 Distributor 45 Merger 46a-d Capillary tube

Claims (7)

A compressor that compresses refrigerant, a water-refrigerant heat exchanger that exchanges heat between high-temperature refrigerant and water, a decompression device that depressurizes refrigerant, and an evaporator that exchanges heat between refrigerant and air in order to form a refrigeration In a heat pump type hot water heating apparatus comprising a cycle and a hot water pump for sending high temperature water generated by the water refrigerant heat exchanger to a heating terminal, the refrigerant flow path in the evaporator is divided into a plurality of branches, and configured. The heat exchange amount between the air and the refrigerant in at least one of the plurality of refrigerant channels in the evaporator is smaller than the heat exchange amount between the air and the refrigerant in the other refrigerant channels in the evaporator. It is comprised so that it may become. The heat pump type hot water heating apparatus characterized by the above-mentioned. A compressor that compresses refrigerant, a water-refrigerant heat exchanger that exchanges heat between high-temperature refrigerant and water, a decompression device that depressurizes refrigerant, and an evaporator that exchanges heat between refrigerant and air in order to form a refrigeration A heat pump type hot water heating apparatus comprising a cycle, a hot water storage tank for storing high temperature water generated by the water refrigerant heat exchanger, and a hot water pump for sending the high temperature water in the hot water storage tank to a heating terminal. The refrigerant flow path is divided into a plurality of branches, and the amount of heat exchange between the air and the refrigerant in at least one of the plurality of refrigerant flow paths in the evaporator is determined by the other refrigerant flow paths in the evaporator. The heat pump type hot water heating apparatus is configured so as to be less than the heat exchange amount between the air and the refrigerant. The pipe length of at least one refrigerant flow path among the plurality of refrigerant flow paths in the evaporator is shorter than the pipe length of other refrigerant flow paths in the evaporator. Heat pump type hot water heater. The heat transfer performance of a pipe of at least one refrigerant flow path among the plurality of refrigerant flow paths in the evaporator is lower than the heat transfer performance of a pipe of another refrigerant flow path in the evaporator. Item 4. The heat pump hot water heater according to any one of Items 1 to 3. The evaporator is configured in two front and rear rows, a refrigerant flow flowing through at least one of the plurality of refrigerant channels in the evaporator and a parallel flow with the air flow, and the other refrigerant channels in the evaporator The heat pump type hot water heating apparatus according to any one of claims 1 to 4, wherein the flowing refrigerant flow and the air flow are counterflows. 6. The refrigerant amount flowing to at least one refrigerant flow channel among the plurality of refrigerant flow channels in the evaporator is larger than the refrigerant amount flowing to other refrigerant flow channels in the evaporator. The heat pump type hot water heating apparatus according to any one of the above. The heat pump unit that houses the compressor, the decompression device, and the evaporator and the heat exchange unit that houses the water-refrigerant heat exchanger are configured as separate units, and the heat exchange unit is disposed indoors. The heat pump type hot water heater according to any one of claims 1 to 6, wherein

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