JP2009174753A - Heat exchanger and heat pump water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an integrated compact heat exchanger low in radiation loss as a heat exchanger exchanging heat among three or more circuits in which heat mediums are circulated, and to provide a heat pump water heater using the heat exchanger. <P>SOLUTION: This heat exchanger comprises a first flow channel 22 for circulating the first heat medium, a second flow channel 23 disposed near the first flow channel 22 for circulating the second heat medium, a third flow channel 24 disposed near the first flow channel 22 or the second flow channel 23 for circulating the third heat medium, and a heat conductive resin 25 integrally surrounding the first flow channel 22, the second flow channel 23 and the third flow channel 24, and heat can be exchanged between the first heat medium and the second heat medium between the first heat medium and the third heat medium, and between the second heat medium and the third heat medium. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat exchanger and a heat pump water heater, and more particularly to a heat exchanger that exchanges heat between, for example, three or more heat media, and a heat pump water heater that has three or more circuits that circulate the heat media.

A conventional heat exchanger that exchanges heat between the first fluid and the second fluid and also exchanges heat between the first fluid and the third fluid, and the second fluid is provided on one side of a flat first tube through which the first fluid flows. There is a heat exchanger in which a second tube through which the third fluid flows is joined and a third tube through which the third fluid flows is joined to the other side of the first tube (see, for example, Patent Document 1).
Further, as a heat exchanger unit of a hot water storage type hot water supply apparatus having a hot water storage tank, the primary side which is the heating side is formed by one circuit, the secondary side to be heated is constituted by at least two circuits, and the primary side refrigerant pipe and There is a configuration in which the water pipe for hot water supply on the secondary side and the water pipe for heating the bathtub are wound in the same coil shape so that the primary side and the secondary side are alternately arranged (for example, see Patent Document 2).

JP 2003-28582 A (page 4, FIG. 2) JP 2005-315553 A (page 9 to page 12, FIG. 3)

  However, the heat exchanger having the conventional configuration disclosed in Patent Document 1 exchanges heat between the first fluid and the second fluid and also exchanges heat between the first fluid and the third fluid. The third fluid was not configured to exchange heat. For example, Embodiment 1 in which the first fluid is a refrigerant, the second fluid is water, and the third fluid is brine is described. In this case, heat can be exchanged between the refrigerant and water, and heat can be exchanged between the refrigerant and brine. However, it was not the structure which can heat-exchange water and brine. In the second embodiment, the refrigerant and water and the water and brine can be heat-exchanged, but the refrigerant and brine cannot be heat-exchanged.

  Moreover, the heat exchanger of the conventional structure published in patent document 2 was also a structure which does not heat-exchange between the heat exchanger for reheating which is a secondary side tube, and the heat exchanger for heating. Furthermore, both the refrigerant pipe and the water pipe are circular pipes, and a contact portion between the refrigerant pipe and the water pipe cannot take a sufficient heat transfer area. For this reason, in order to ensure the necessary heat exchange amount, the length of the pipe has to be increased, and there is a problem that the heat exchanger is increased in size and weight. In addition, because it is wound in a coil shape, the area that comes into contact with the surrounding air is large, and in order to reduce heat dissipation loss, a large area of heat insulating material that covers the heat exchanger is required, which increases the material cost and processing cost of the heat exchanger. There is also the problem of doing.

The present invention has been made to solve the above-described problems, and is a heat exchanger for exchanging heat between three or more heat media, and exchanging heat between the first heat media and the second heat media. A heat exchanger configured to exchange heat between the first heat medium and the third heat medium, and further configured to exchange heat between the second heat medium and the third heat medium, The purpose is to obtain a compact heat exchanger with low heat dissipation loss.
Moreover, it aims at obtaining the heat pump water heater using this heat exchanger.

  The heat exchanger according to the present invention includes a first flow path through which a first heat medium flows, a second flow path that is provided close to the first flow path and through which a second heat medium flows, A third flow path that is provided close to the first flow path or the second flow path and through which the third heat medium flows; and has thermal conductivity; the first flow path and the second flow path; A heat conductive resin that surrounds and integrates the third flow path, and exchanges heat between the first heat medium flowing through the first flow path and the second heat medium flowing through the second flow path. Enabling heat exchange between the first heat medium flowing through the first flow path and the third heat medium flowing through the third flow path, and the second heat medium flowing through the second flow path and the Heat exchange is possible with the third heat medium flowing through the third flow path.

  The heat pump water heater according to the present invention includes a compressor, a heat exchanger that operates as a radiator, an expansion valve, a refrigeration cycle that circulates a refrigerant by connecting an evaporator in an annular manner, a hot water tank, and the heat exchanger And a hot water supply circuit that circulates water by connecting a hot water pump in an annular shape, and a heat utilization circuit that circulates a heat medium by connecting the heat exchanger and the circulation pump in an annular shape, the heat exchanger comprising: The heat exchanger according to the above, wherein the high-temperature refrigerant discharged from the compressor of the refrigeration cycle is circulated through the first flow path of the heat exchanger, and the second flow path and the third flow path are The water circulating in the hot water supply circuit is circulated through one of the flow paths, and the heat medium circulating through the thermal utilization circuit is circulated through the other flow path.

In the heat exchanger according to the present invention, the heat conductive resin is provided so as to surround the first flow path, the second flow path, and the third flow path, and the plurality of flow paths of the heat exchanger are integrated. The first heat medium flowing through the first flow path and the second heat medium flowing through the second flow path can exchange heat, and the second heat medium flowing through the second flow path and the third heat medium flowing through the third flow path In addition, the first heat medium flowing in the first flow path and the third heat medium flowing in the third flow path can be heat-exchanged via the heat conductive resin. Moreover, by integrating, it is possible to reduce the external surface area of the heat exchanger with a compact configuration, and to reduce heat dissipation loss to the surrounding air.
In addition, a heat pump water heater using this heat exchanger can be configured compactly, and can be effectively used in a heat utilization circuit by selecting a heat source by a refrigeration cycle and a heat source by heat in a hot water tank.

Embodiment 1 FIG.
FIG. 1 is a circuit configuration diagram showing a heat pump water heater according to Embodiment 1 of the present invention. The refrigeration cycle 100 has an annular connection between the compressor 1, a hot water supply and integrated heat exchanger 2 that is a heat exchanger that operates as a radiator, an expansion valve 3, and an evaporator 4, and uses refrigerant as a first heat medium. Circulate. The hot water supply circuit 12 circulates the second heat medium by connecting the hot water supply tank 10, the hot water supply and regenerative integrated heat exchanger 2, and the hot water supply pump 11 in an annular shape. Further, for example, the reheating circuit 15 as a heat utilization circuit circulates the third heat medium by connecting the bathtub 13, the hot water reheating integrated heat exchanger 2, and the recirculation pump 14 that is a circulation pump in an annular shape. Here, as the refrigerant that is the first heat medium, for example, any one of carbon dioxide, hydrocarbon, or HFC refrigerant is circulated, the second heat medium is, for example, hot water tank water, and the third heat medium is, for example, a bathtub. Use water. A blower 5 is provided in the vicinity of the evaporator 4 in the refrigeration cycle 100.

  FIG. 2 is an exploded perspective view showing the structure of a heat pump water heater showing an example of the present embodiment. Here, the hot water supply tank 10 and the hot water supply pump 11 in the hot water supply circuit 12 and the bathtub 13 and the additional pump 14 in the reheating circuit 15 are omitted, and only the heat source machine of the portion constituting the refrigeration cycle 100 is described. ing. For example, the hot water supply and regenerative integrated heat exchanger 2 is disposed near the bottom surface of the heat source machine and is not shown, but is connected to the hot water supply tank 10 and the bathtub 13 via the hot water supply circuit 12 and the reheating circuit 15. Is done.

  FIG. 3 is a perspective view showing, for example, a hot water supply and tracking integrated heat exchanger 2 as a heat exchanger according to the present embodiment. Although not shown here, in the heat exchanger 2, the first flow path 22, the second flow path 23, and the third flow path 24 constitute flow paths that flow substantially in parallel with each other. The parallel flow is not limited to the parallel flow direction, and the flow direction of one flow path is inclined by about 0 to 45 degrees in any direction such as up, down, left, and right with respect to the other flow path. It may be. From the block integrated by the heat conductive resin 25, for example, the inlet and outlet pipes of the flat heat transfer tube 21, the second flow channel 23, and the third flow channel 24 constituting the first flow channel 22 are provided. Furthermore, the first distribution header 26 that causes the refrigerant flowing through the refrigeration cycle 100 to flow into and out of the plurality of flow paths of the flat heat transfer tubes 21, and hot water tank water that flows through the hot water supply circuit 12, for example, the second flow path 23 of the heat exchanger 2. A second distribution header 27 that flows into and out of the heat exchanger 2 and a third distribution header 28 that flows in and out of the bathtub water flowing through the tracking circuit 15 into, for example, the third flow path 24 of the heat exchanger 2 are connected.

  FIG. 4 is a diagram showing in detail the cross section of the hot water supply and tracking integrated heat exchanger 2, and is a vertical cross sectional view taken along the line PP in FIG. The first flow path 22, the second flow path 23, and the third flow path 24 that flow substantially in parallel with each other, the second flow path 23 is brought close to the direction substantially perpendicular to the flow direction of the first flow path 22. The third flow path 24 is provided close to the first flow path 22 on the substantially opposite side of the second flow path 23. For example, the flat heat transfer tube 21 is arranged at the center, and the second flow path 23 through which the hot water tank water flows is arranged close to one side of the flat surface where the flat heat transfer tube 21 faces. Furthermore, the 3rd flow path 24 through which bathtub water distribute | circulates is arrange | positioned adjacent to the other side of the flat surface where the flat heat exchanger tube 21 opposes. Here, for example, the first flow path 22 through which the refrigerant circulating in the refrigeration cycle 100 flows is formed as a flat heat transfer tube 21 in which a plurality of parallel flow paths are integrally formed and the outer shape is flat. The flat heat transfer tube 21 is made of, for example, aluminum or an aluminum alloy. Moreover, the 2nd flow path 23 and the 3rd flow path 24 are each made into one rectangular heat exchanger tube, for example, are comprised with copper or stainless steel. Further, for example, the entire flat heat transfer tube 21, the second flow path 23, and the third flow path 2 are enclosed in a block shape and integrated by a heat conductive resin 25 that performs heat conductivity.

In the heat exchanger 2 having such a configuration, the refrigerant flowing through the first flow path 22 and the hot water tank water flowing through the second flow path 23 are composed of the heat transfer tubes forming the flow paths and the thermal conductivity interposed therebetween. Heat exchange is possible through the resin 25. In addition, the refrigerant flowing through the first flow path 22 and the bathtub water flowing through the third flow path 24 can exchange heat via the heat transfer tubes constituting the flow path and the heat conductive resin 25 interposed therebetween. is there. Furthermore, the hot water tank water flowing through the second flow path 23 and the bathtub water flowing through the third flow path 24 are also separated from each other by a distance between the heat transfer tubes constituting the flow path. Heat exchange is possible through the heat conductive resin 25 interposed therebetween.
Here, the third flow path 24 is provided adjacent to the first flow path 22 in the direction perpendicular to the second flow path 23 in the perpendicular direction, but is not limited thereto. The second flow path 23 and the third flow path 24 may be on the opposite side to the first flow path 22 to some extent. For example, in FIG. 4, the second flow path 23 is provided at a position biased to the right side in the drawing at the lower side of the flat heat transfer tube 21, and the second flow path 23 is placed at a position biased to the left side in the drawing at the upper side of the flat heat transfer tube 21. Three flow paths 24 may be provided.

  The thermally conductive resin 25 is made of, for example, a mixture of resin and metal powder having good thermal conductivity, or a mixture of resin and carbon. Examples of the resin include an epoxy resin, but other resins may be used. Examples of the metal powder having good heat conduction include aluminum, copper, and silver. The thermal conductivity of the thermal conductive resin 25 is desirably 10 W / mK or more. The thermal conductivity in the case of a normal resin is, for example, about 1 W / mK, the thermal conductivity of copper is 386 W / mK, the thermal conductivity of aluminum is 228 W / mK, and the thermal conductivity of stainless steel is 16.3 W / mK. However, in the present embodiment, referring to these, a thermally conductive resin having a thermal conductivity of approximately 10 W / mK or more is used. That is, any kind of metal may be mixed with the resin, but a heat conductive resin having a heat transfer performance of about 10 times or more and stainless steel is used as compared with a normal resin.

  Hereinafter, the hot water tank boiling operation by the heat pump water heater in the present embodiment will be described. The compressor 1, the blower 5, and the hot water supply pump 11 shown in FIG. 1 are operated, and the refrigeration cycle 100 and the hot water supply circuit 12 are operated. By operating the refrigeration cycle 100, the high-temperature and high-pressure refrigerant discharged from the compressor 1 flows into the heat exchanger 2 and dissipates heat to a low temperature. The high-pressure and low-temperature refrigerant that has flowed out of the hot-water supply / integrated heat exchanger 2 passes through the expansion valve 3 and is decompressed to a low-pressure gas-liquid two-phase state. Further, the evaporator 4 absorbs heat from outside air to be converted into evaporative gas and is sucked into the compressor 1 again. At the same time, since the hot water supply pump 11 operates, the hot water supply tank water flows into the heat exchanger 2, and heat is generated between the refrigerant flowing in the flat heat transfer tube 21 and the hot water supply tank water flowing in the second flow path 23. Exchanged. At this time, heat is dissipated from the refrigerant to the hot water tank water, so that the temperature of the hot water tank water rises and is stored in the hot water tank 10.

  If the refrigerant used in the refrigeration cycle 100 is, for example, carbon dioxide, the high-pressure side refrigerant pressure is equal to or higher than the critical pressure, the refrigerant is cooled in the heat exchanger 2 while maintaining the supercritical state without causing a gas-liquid phase transition. To do. Moreover, if the refrigerant | coolant to be used is a high pressure side refrigerant | coolant pressure below a critical pressure, for example like a hydrocarbon refrigerant | coolant or a HFC refrigerant | coolant, a refrigerant | coolant will radiate | emit heat while liquefying.

When the hot water tank heating operation is performed, since the reheating pump 14 of the reheating circuit 15 is stopped, the bath water does not flow into the third flow path 24 in the heat exchanger 2. 4, the heat of the high-temperature and high-pressure gas refrigerant flowing through the first flow path 22 is aluminum that forms the flat heat transfer tube 21 by heat conduction, and the flat heat transfer tube 21. Is transmitted to the second flow path 23 made of copper or stainless steel, and further to the circulating water of the hot water supply circuit 12 flowing inside the second flow path 23. When hot water of about 90 ° C. is stored in the hot water supply tank 10, the refrigerant flows into the heat exchanger 2 at about 100 ° C., and heat is supplied to the hot water flowing through the second flow path 23 to reach a refrigerant temperature of about 20 ° C. Decrease and spill.
In recent years, energy saving has been required, and this hot water tank boiling operation is performed using a midnight electric power time zone where electric power charges are low, and hot water is stored. Moreover, it may be performed at any time when the temperature in the hot water supply tank 10 is lowered. Moreover, in the hot water supply tank 10, for example, high-temperature water is used for hot water supply from above, and tap water is supplied from below.

  Next, the operation of the bathtub follow-up operation by the heat pump water heater of the present embodiment will be described. The heat pump water heater according to the present embodiment has a first bathtub replenishing system using a refrigerant as a heat source and a second bathtub reheating system using high-temperature water in the hot water tank 10 as a heat source. The water heater having these two methods is realized by using a heat exchanger in which two of the first, second, and third heat media can exchange heat.

  First, the operation of the first bathtub reheating method using the refrigerant circulating in the refrigeration cycle 100 as a heat source will be described. The refrigeration cycle is operated by operating the compressor 1 and the blower 5. The operation of the refrigerant circulating in the refrigeration cycle 100 is similar to the hot water tank boiling operation for raising the water temperature in the hot water tank 10, and at the same time, the reheating pump 14 is operated to operate the reheating circuit 15. Bath water in the bathtub 13 circulates by the reheating pump 14 and flows through the third flow path 24 of the hot water supply revolving integrated heat exchanger 2. On the other hand, the high-temperature and high-pressure refrigerant discharged from the compressor 1 flows through the flat heat transfer tube 21 of the hot water supply and regenerative integrated heat exchanger 2.

  When this operation is performed, the hot water supply pump 11 of the hot water supply circuit 12 is stopped, so that hot water tank water does not flow into the second flow path 23 in the heat exchanger 2. For this reason, in the heat exchanger 2, heat exchange is performed between the fluid flowing through the flat heat transfer tube 21 and the third flow path 24. In this operation, inside the hot water supply and integrated heat exchanger 2, the heat of the high-temperature and high-pressure gas refrigerant flowing through the first flow path 22 surrounds the aluminum constituting the flat heat transfer tube 21 and the flat heat transfer tube 21 by heat conduction. Via the heat conductive resin 25, it is transmitted to the bathtub water flowing inside the third flow path 24 made of copper or stainless steel, and heat exchange is performed. Reheating is performed by applying heat radiated from the refrigerant to the bath water circulating in the reheating circuit 15.

  Next, the operation of the second bathtub reheating method using high-temperature water circulating in the hot water supply circuit 12 as a heat source will be described. The hot water supply pump 11 of the hot water supply circuit 12 and the reheating pump 14 of the reheating circuit 15 are operated, and the operation of the compressor 1 is stopped. The high temperature water sucked from the hot water supply tank 10 by the hot water supply pump 11 flows into the second flow path 23 of the hot water supply and regenerative integrated heat exchanger 2. On the other hand, the bath water sucked from the bathtub 13 by the reheating pump 14 flows into the third flow path 24 of the hot water resupplying integrated heat exchanger 2. At this time, the refrigerant does not flow through the flat heat transfer tube 21.

  Inside the hot water supply and regenerative integrated heat exchanger 2, the heat of the high-temperature water flowing out from the hot water supply tank 10 that circulates through the second flow path 23 is the second flow path 23 made of copper or stainless steel by heat conduction, Is transferred to the bathtub water flowing through the inside of the third flow path 24 made of copper or stainless steel through the conductive resin 25 and the aluminum material of the flat heat transfer tube 21 to perform heat exchange.

In this hot water supply and tracking integrated heat exchanger 2, a flat heat transfer tube 21 having a plurality of first flow passages 22 through which a high-temperature and high-pressure refrigerant that is a first heat medium circulates, and the flat heat transfer tube 21 are adjacent. The second flow path 23 through which the high-temperature water in the hot water supply tank 10, which is the second heat medium, circulates, and the flat heat transfer pipe 21 is opposed to the second flow path 23 and provided close to the flat heat transfer pipe 21. Since the third flow path 24 through which the circulating hot water of the bathtub 13 which is the third heat medium flows is integrated by the heat conductive resin 25 having a high heat conductivity, the hot water supply is heated with a compact and lightweight configuration. It is possible to realize a heat exchanger having both functions of heating and reheating.
Moreover, since the outer surface area of the heat exchanger 2 can be made small, the heat dissipation loss to ambient air can be reduced.

  In the configuration shown in FIGS. 3 and 4, the entire flow paths 22, 23, and 24 are surrounded and integrated by the heat conductive resin 25, but the present invention is not limited to this. For example, a part of the heat transfer tubes constituting the second flow path 23 and the third flow path 24 may be exposed even if they do not surround the whole. For example, in the configuration shown in FIG. 4, a configuration in which a portion of the heat transfer tube having a long horizontal length at the left and right ends is exposed may be used. Further, the vicinity of the entrance / exit of the heat transfer tube may be exposed due to its configuration. Of course, as shown in FIG. 3, the heat loss can be reduced by a configuration in which the entire flow paths 22, 23, 24 are encapsulated. Moreover, when it mounts in a heat source machine, it becomes the structure which is easy to mount by block-ization. Moreover, if a part or the whole of the heat exchanger 2 is wrapped with a heat insulating material, the heat loss can be further reduced.

  In the present embodiment, the high-temperature and high-pressure gas of the refrigeration cycle 100 and the high-temperature water in the hot water supply tank 10 can be selected as necessary as the heat source for the chasing operation. For example, when there is a large amount of high-temperature water in the hot water supply tank 10, a heat pump water heater that can save electricity can be configured by performing the bathtub reheating operation using the high-temperature water without operating the refrigeration cycle 100. Further, when the hot water in the hot water supply tank 10 becomes small, if the bathtub reheating operation is performed using the refrigeration cycle 100, the hot water in the hot water supply tank 10 is operated stably without running out of hot water. Heat pump water heater can be configured. In addition, the heat pump water heater having various operation methods can be obtained by selecting a plurality of operation methods according to the situation without being limited thereto.

  Moreover, since the flow path of the refrigerant in the heat exchanger 2 is the flat heat transfer tube 21 in which a plurality of flow paths arranged in parallel are integrated, it is possible to increase the pressure resistance of the heat transfer tube through which the refrigerant circulates. The heat transfer area per area can also be increased. In addition, since both sides facing each other are flat, it is easy to arrange other heat transfer tubes on both sides, and the heat exchanger 2 can be configured with three heat medium channels in a compact configuration, and is mounted on a heat source as shown in FIG. It's easy to do.

Moreover, since the 2nd flow path 23 and the 3rd flow path 24 are comprised with copper or stainless steel, the deformation | transformation of a flow path can be suppressed with water pressure, and destruction of a heat conductive resin can be prevented. Moreover, when integrating with a heat conductive resin, insert molding is possible and it can manufacture easily. Of course, the second flow path 23 and the third flow path 24 may be made of the same material, but may be made of different materials. A material having a thermal conductivity of at least about stainless steel is preferable.
Moreover, although the 2nd flow path 23 and the 3rd flow path 24 were made into one rectangular heat exchanger tube, it does not need to be the same shape. Further, even if the flow path is constituted by a plurality of, for example, two or more rectangular heat transfer tubes, the same effect can be obtained. If the second flow path 23 and the third flow path 24 are formed into a plurality of rectangular heat transfer tubes, the thermal conductivity around the second flow path 23 and the third flow path 24 compared to the configuration of one heat transfer tube. The area in contact with the resin 25 is increased. For this reason, heat exchange can be performed efficiently. Moreover, you may comprise the 1st flow path 22 with the one rectangular heat transfer tube similar to the 2nd, 3rd flow paths 23 and 24 instead of the flat heat transfer tube 21. FIG.

Moreover, although the flat heat exchanger tube 21 was arrange | positioned in the center part between the 2nd flow path 23 and the 3rd flow path 24, it does not restrict to this. For example, the second flow path 23 and the third flow path 24 may be disposed close to each other, and the flat heat transfer tube 21 and the second flow path 23 may be disposed close to each other. That is, the second flow path 23 through which the hot water tank water circulates may be disposed at the center, and the flat heat transfer tube 21 may be disposed on one side, and the third flow path 24 may be disposed on the other side. When the hot water in the hot water supply tank 10 is often used when chasing the bath water, the heat exchange can be efficiently performed by arranging the flow paths in this order.
Further, as shown in FIG. 4, the flow path is configured in the order of the second flow path 23, the flat heat transfer tube 21, and the third flow path 24 from the bottom. You may make it distribute | circulate through a different flow path.

  In addition, although between the flat heat-transfer tube 21 and the 2nd flow path 23 and between the flat heat-transfer tube 21 and the 3rd flow path 24 is filled with the heat conductive resin 25, heat transfer resistance ( The heat exchange performance is improved because the thermal conductivity / distance is small. That is, the width of the heat conductive resin 25 existing between the flat heat transfer tube 21 and the second flow path 23, the flat heat transfer tube 21 and the third flow path 24, and the second flow path 23 and the third flow path 24 is small. The heat exchange performance can be improved as much as possible. For example, the flat heat transfer tube 21 and the second flow path 23 in FIG. 4 may be brought into contact with each other, and the heat conductive resin 25 may not be interposed therebetween. Similarly, the flat heat transfer tube 21 and the third flow path 24 in FIG. 4 may be brought into contact with each other, and the heat conductive resin 25 may not be interposed therebetween.

  Moreover, although the 2nd, 3rd flow paths 23 and 24 were comprised by the rectangular heat exchanger tube, the same effect is show | played even if it is one or several circular heat exchanger tubes whose cross section is elliptical. FIG. 5 shows another configuration example. FIG. 5 shows a cross section of the heat exchanger 2, and shows cross sections of the flow paths 22, 23 and 24. For example, the first flow path 22 through which the refrigerant flows and the second flow path 23 through which the hot water is circulated are provided close to the first flow path 22 and the first flow path 22 or the second flow path 23. For example, the third flow path 24 through which the bath water flows and the thermal conductivity are provided, and the first flow path 22, the second flow path 23, and the third flow path 24 are surrounded and integrated. The heat exchanger 2 is provided with a heat conductive resin 25. Each of the first flow path 22, the second flow path 23, and the third flow path 24 having this configuration is constituted by one heat transfer tube having a circular cross-sectional shape perpendicular to the flow path.

In this configuration, the first flow path 22, the second flow path 23, and the third flow path 24 that flow substantially in parallel with each other, and the second flow path 23 is substantially in the flow direction of the first flow path 22. The third flow path 24 is provided in the vicinity of the first flow path 22 and the second flow path 23. In this configuration example, the second flow path 23 and the third flow path 24 are provided close to the first flow path 22 at positions that are not substantially opposite to each other. Even in this configuration, the first flow path 22, the second flow path 23, and the third flow path 24 are surrounded and integrated by the heat conductive resin 25, and the first heat medium flowing through the first flow path 22 Heat exchange with the second heat medium flowing through the second flow path 23 is possible, and heat exchange between the first heat medium flowing through the first flow path 22 and the third heat medium flowing through the third flow path 24 is possible. Furthermore, heat exchange between the second heat medium flowing through the second flow path 23 and the third heat medium flowing through the third flow path 24 is possible. Therefore, it is possible to obtain a compact heat exchanger with a small heat dissipation loss to the ambient air with a configuration in which any two of the first, second, and third heat media can exchange heat with each other. is there.
Even if at least one of the first flow path 22, the second flow path 23, and the third flow path 24 is configured with a plurality of heat transfer tubes in the configuration of FIG. 5, the same effect is obtained.

  FIG. 6 shows still another configuration example. It is a side view which shows the heat exchanger 2 of the structural example in which the 1st flow path 22, the 2nd flow path 23, and the 3rd flow path 24 are not the flow paths which mutually flow in parallel. For example, the first flow path 22 through which the refrigerant flows and the second flow path 23 through which the hot water is circulated are provided close to the first flow path 22 and the first flow path 22 or the second flow path 23. For example, the third flow path 24 through which the bath water flows and the thermal conductivity are provided, and the first flow path 22, the second flow path 23, and the third flow path 24 are surrounded and integrated. The heat exchanger 2 is provided with a heat conductive resin 25. Each of the first flow path 22, the second flow path 23, and the third flow path 24 is configured by a heat transfer tube having a circular or rectangular cross section perpendicular to the flow path.

In FIG. 6, the heat transfer tubes of the first flow path 22 and the second flow path 23 and the first flow path 22 and the third flow path 24 are substantially in contact with each other. For this reason, heat exchange is possible between the first heat medium flowing through the first flow path 22 and the second heat medium flowing through the second flow path 23, and the first heat medium flowing through the first flow path 22 and the third heat medium. Heat exchange with the third heat medium flowing through the flow path 24 is possible. Further, the second flow path 23 and the third flow path 24 have few contact portions, but are surrounded by the heat conductive resin 25 having heat conductivity, and therefore the second heat medium flowing through the second flow path 23. And the third heat medium flowing through the third flow path 24 can exchange heat via the heat conductive resin 25. Therefore, it is possible to obtain a compact heat exchanger with a small heat dissipation loss to the ambient air with a configuration in which any two of the first, second, and third heat media can exchange heat with each other. is there.
In such a configuration, even if at least one of the first flow path 22, the second flow path 23, and the third flow path 24 is configured by a plurality of heat transfer tubes, the same effect is obtained.

  As described above, according to the present embodiment, the first flow path 22 through which the first heat medium flows and the second flow path provided near the first flow path 22 and through which the second heat medium flows. A first flow path 22, a third flow path 24 that is provided close to the first flow path 22 or the second flow path 23, and through which a third heat medium flows; A heat conductive resin 25 surrounding and integrating the second flow path 23 and the third flow path 24, and a first heat medium flowing through the first flow path 22 and a second flow path flowing through the second flow path 23. Heat exchange with the second heat medium, heat exchange between the first heat medium flowing through the first flow path 22 and the third heat medium flowing through the third flow path 24, and further, By making heat exchange between the flowing second heat medium and the third heat medium flowing in the third flow path 24, any two of the first, second, and third heat mediums possible. In configuration capable heat exchanger, there is an effect that less heat exchanger of heat radiation loss to the surrounding air is obtained.

  Further, the first flow path 22, the second flow path 23, and the third flow path 24 that flow substantially in parallel with each other, the first flow path 22 through which the first heat medium flows, and the first flow path 22 A second flow path 23 that is provided in a direction substantially perpendicular to the flow direction and through which the second heat medium flows, and is close to the first flow path 22 on the substantially opposite side of the second flow path 23. The third flow path 24 through which the third heat medium flows is provided, has thermal conductivity, and surrounds and integrates the first flow path 22, the second flow path 23, and the third flow path 24. The first heat medium flowing through the first flow path 22 and the second heat medium flowing through the second flow path 23 can exchange heat, and the first heat medium flowing through the first flow path 22 Heat exchange between the first heat medium and the third heat medium flowing through the third flow path 24, and the second heat medium flowing through the second flow path 23 and the third heat medium flowing through the third flow path 24. Can be exchanged through the heat conductive resin 25, so that any two heat media can be exchanged with the first, second, and third heat media, and the size and weight can be reduced. A heat exchanger with little heat dissipation loss to the ambient air can be obtained. In particular, there is an effect of obtaining a heat exchanger that can effectively use the heat source of the first heat medium flowing through the first flow path 22 disposed in the central portion.

  In addition, at least one of the first flow path 22, the second flow path 23, and the third flow path 24 is composed of one or a plurality of rectangular heat transfer tubes, so that the ambient air is compact. There is an effect that a heat exchanger with little heat dissipation loss can be obtained.

  Further, the first heat medium flowing through the first flow path 22 is a refrigerant, and the first flow path 22 is a flat heat transfer tube 21 in which a plurality of parallel flow paths are integrated and the outer shape is flat. By doing so, it is possible to increase the pressure resistance of the heat transfer tube through which the refrigerant circulates, and it is possible to obtain a heat exchanger that can have a large heat transfer area per volume.

  Further, the second flow path 23 is provided close to one side of the flat surface facing the flat heat transfer tube 21, and the third flow path 24 is close to the other side of the flat surface facing the flat heat transfer tube 21. By providing, when exchanging heat between the refrigerant and the second heat medium, and when exchanging heat between the refrigerant and the third heat medium, the distance between the flow paths can be shortened, and the heat exchanger has a high heat exchange efficiency. Is obtained.

  Moreover, the heat exchanger which can suppress the deformation | transformation of the flow path by the water pressure of the circulating heat medium by comprising at least one flow path of the 2nd flow path 23 and the 3rd flow path 24 with copper or stainless steel. can get.

  Moreover, the heat exchanger which can be manufactured easily at the time of shaping | molding is obtained by comprising the 1st flow path 22, the 2nd flow path 23, and the 3rd flow path 24 with each one rectangular tube. Since the distance between the rectangular tubes is equal to that of the circular tube, a heat exchanger capable of uniformly exchanging heat is obtained.

  In addition, the heat conductive resin 25 is a mixture of resin and metal powder or a mixture of resin and carbon, and has a heat conductivity of 10 W / mK or more, so that the first, second, third A heat exchanger having a high heat exchange efficiency can be obtained with a configuration in which any two heat media can be exchanged.

  In particular, when a heat pump water heater provided with a hot water supply tank 10 of about 400 liters, for example, it is necessary to configure the apparatus by storing the heat source device shown in FIG. . In this case, as an example, the heat source device must be stored in a range of about 0.5 m in length, 0.2 m in width, and 0.1 m in depth. In the case of a heat pump water heater having such a capacity, the heat exchanger 2 is configured by surrounding and integrating the flow paths 22, 23, 24 using a heat conductive resin 25 having a heat conductivity of 10 W / mK or more. For example, a sufficient amount of heat exchange can be obtained within this size range. For example, if a similar heat exchange amount is obtained using a thermal conductive resin having a thermal conductivity of about 5 W / mK, the size may be doubled, and the heat source machine becomes larger. It becomes impossible to install, and versatility is impaired.

  Further, the compressor 1, the heat exchanger 2 that operates as a radiator, the expansion valve 3, and the evaporator 4 are connected in an annular shape to circulate the refrigerant, the hot water supply tank 10, the heat exchanger 2, and the hot water supply. A hot water supply circuit 12 that circulates water by connecting the pump 11 in an annular shape, and a heat utilization circuit 15 that circulates the heat medium by connecting the heat exchanger 2 and the reheating pump 14 in an annular shape, and 1, the high-temperature refrigerant discharged from the compressor 1 of the refrigeration cycle 100 is circulated through the first flow path 22 of the heat exchanger 2, and hot water is supplied to the second flow path 23. By using the heat exchanger 2 that is compact and has a small heat dissipation loss, water that circulates through the circuit 12 is circulated and a heat medium that circulates through the heat utilization circuit 15 is circulated through the third flow path 24. Can be used effectively and save electricity Pump water heater can be obtained.

  Moreover, the heat utilization circuit 15 connects the bathtub and circulates the bathtub water, exchanges heat with the refrigerant circulating in the refrigeration cycle 100 or the hot water circulating in the hot water supply circuit 12 in the heat exchanger 2, and bath water. A heat pump water heater capable of efficiently saving power and chasing bathtub water according to the situation is obtained by being a reheating circuit that raises the temperature.

  Moreover, by having the hot water utilization operation which uses the heat source required in the heat utilization circuit 15 as the hot water in the hot water supply tank 10, and the refrigeration cycle operation by the refrigeration cycle 100 as the heat source necessary in the heat utilization circuit 15, the situation Therefore, a heat pump water heater that can efficiently save electricity and follow up the bath water can be obtained.

Embodiment 2. FIG.
FIG. 7 is a perspective view showing, for example, a hot water supply replenishing integrated heat exchanger 2a as a heat exchanger according to Embodiment 2 of the present invention. FIG. 8 is a longitudinal sectional view taken along line QQ in FIG. In the present embodiment, each of the second flow path 23 and the third flow path 24 is constituted by, for example, a plurality of circular heat transfer tubes. Note that in this embodiment, configurations and operations not particularly described here are the same as those in Embodiment 1, and the same reference numerals denote the same or corresponding parts.

  In the heat exchanger 2a shown in FIG. 7, from the block integrated by the heat conductive resin 25, the flat heat transfer tube 21 which is a 1st flow path, and the 2nd flow path 23a comprised by the several circular heat transfer tube. The third distribution header 26, the second distribution header 27, and the third distribution header 28 are connected to each other.

  As shown in FIG. 8, similarly to the first embodiment, the flat heat transfer tube 21 is arranged in the center, the second flow path 23 a through which the hot water tank water flows is arranged on one side of the flat heat transfer tube 21, and bath water The third flow path 24 a through which the gas flows is disposed on the other side of the flat heat transfer tube 21. Here, for example, the first flow path 22 through which the refrigerant circulating in the refrigeration cycle 100 flows is formed as a flat heat transfer tube 21 made of aluminum or aluminum alloy having a plurality of flow paths arranged in parallel and having a flat outer shape. Each of the second flow path 23a and the third flow path 24a is a circular flow path formed of a plurality of copper or stainless steel circular heat transfer tubes, and is opposed to each other with a flat heat transfer tube 21 disposed in the center. Deploy.

  A flat heat transfer tube 21 through which, for example, a refrigerant as a first heat medium circulates, a second flow path 23a through which, for example, hot water tank water as a second heat medium circulates, and, for example, bath water as a third heat medium. The 3rd flow path 24a which distribute | circulates is enclosed by the heat conductive resin 25 which makes heat conductivity. Here, since the flat heat transfer tube 21, the second flow path 23a, and the third flow path 24a are integrated with the heat conductive resin 25, heat can be exchanged between the refrigerant and the hot water tank water. It is possible to exchange heat between the hot water and the bathtub water, and to exchange heat between the hot water tank water and the bathtub water.

  In the hot water supply and regenerative integrated heat exchanger 2a according to the present embodiment, each of the second flow path 23a and the third flow path 24a is a circular flow path configured with a plurality of copper or stainless steel circular heat transfer tubes. The water pressure of the heat medium flowing through the inside is evenly applied to the inner wall of the circular heat transfer tube. For this reason, the deformation | transformation with respect to the heat exchanger tubes 23a and 24a by water pressure is suppressed, and destruction of the heat conductive resin 25 which surrounds the outer side can be prevented. Further, since a large area in the pipes of the second and third flow paths 23a and 24a can be ensured, in the heat pump water heater using the hot water supply and regenerative integrated heat exchanger 2a of the present embodiment, for example, a bath reheating operation When performing, the amount of heat exchange between the high-temperature high-pressure gas on the heat source side or the high-temperature water in the hot water supply tank and the circulating water in the bathtub can be improved. Moreover, since the piping currently distribute | circulated can be utilized, it is excellent in versatility and can be manufactured at low cost.

Thus, the water pressure concerning the 2nd and 3rd flow paths 23a and 24a can be equalized by having constituted the 2nd flow path 23a and the 3rd flow path 24a with a plurality of circular heat exchanger tubes. For this reason, the deformation | transformation with respect to the water pressure of a heat exchanger tube is suppressed, and the heat exchanger 2a which can prevent destruction of the heat conductive resin 25 is obtained. Moreover, the heat exchanger 2a which can ensure many pipe | tube internal areas of the 2nd, 3rd flow paths 23a and 24a and can improve the amount of heat exchange is obtained.
Then, by incorporating the heat exchanger 2a capable of improving the heat exchange amount in place of the heat exchanger 2 of the heat pump water heater shown in FIG. 1, it is possible to make the size small and compact, and to save power consumption. it can.

Further, the compressor 1, the heat exchanger 2a operating as a radiator, the expansion valve 3, and the evaporator 4 are connected in an annular manner to circulate the refrigerant, the hot water supply tank 10, the heat exchanger 2a, and the hot water supply. A hot water supply circuit 12 that circulates water by connecting the pump 11 in an annular shape, and a heat utilization circuit 15 that circulates the heat medium by connecting the heat exchanger 2a and the reheating pump 14 in an annular shape, and 2, the high-temperature refrigerant discharged from the compressor 1 of the refrigeration cycle 100 is circulated through the first flow path 22 of the heat exchanger 2 a, and hot water is supplied to the second flow path 23. By using the heat exchanger 2a which is compact and has a small heat dissipation loss, the water circulating through the circuit 12 is circulated and the heat medium circulating through the thermal utilization circuit 15 is circulated through the third flow path 24. Can be used effectively. Can heat pump water heater can be obtained.
In other effects, the same structure as in the first embodiment can be obtained by the same structure as in the first embodiment.

Embodiment 3 FIG.
FIG. 9 is a perspective view showing, for example, a hot water supply reheating integrated heat exchanger 2b as a heat exchanger according to Embodiment 3 of the present invention. FIG. 10 is a longitudinal sectional view taken along line RR in FIG. In the present embodiment, each of the second flow path 23 and the third flow path 24 is configured by a plurality of circular or rectangular heat transfer tubes, and is alternately arranged on both surfaces of the flat heat transfer tube 21 facing each other. Note that in this embodiment, structures and operations not particularly described here are the same as those in Embodiment 1 or Embodiment 2, and the same reference numerals denote the same or corresponding parts.

  In the heat exchanger 2b shown in FIG. 9, from the block 2b integrated by the heat conductive resin 25, the flat flow heat transfer tube 21 which is a 1st flow path, and the 2nd flow path comprised by the some circular heat transfer tube. 23b and the third inlet / outlet piping of the third flow path 24b are connected to the first distribution header 26, the second distribution headers 27a and 27b, and the third distribution headers 28a and 28b, respectively. In the present embodiment, the circular heat transfer tube forming the second flow path 23b and the circular heat transfer tube forming the third flow path 24b are alternately arranged on both sides of the flat surface across the flat heat transfer tube 21. It is arranged. For this reason, the second distribution headers 27a and 27b and the third distribution headers 28a and 28b are provided on both sides of the flat heat transfer tube 21, respectively.

  As shown in FIG. 10, the circular heat transfer tube and the third flow path 24 b that form the second flow path 23 b are formed on the lower side, which is one of the flat surfaces of the flat heat transfer pipe 21, from the left side in the drawing. The circular heat transfer tubes are arranged alternately. And the 2nd distribution header 27a is connected to the heat exchanger tube which comprises the 2nd flow path 23b arrange | positioned every other, and the 3rd distribution header 28a is the 3rd flow path arrange | positioned every other. It connects with the heat exchanger tube which comprises 24b. The same applies to the upper side, which is the other flat surface of the flat heat transfer tube 21, and the third distribution header connected to the heat transfer tubes constituting the third flow paths 24b arranged from the left side as viewed in the drawing. 28b and a second distribution header 27b connected to the heat transfer tube constituting the second flow path 23b arranged every other one. In the hot water supply circuit 12, the flow path is branched upstream of the connection position of the heat exchanger 2b and flows into the second distribution headers 27a and 27b, and the second distribution is performed downstream of the connection position of the heat exchanger 2b. The heat medium flowing out from the headers 27a and 27b is joined. Further, in the chase circuit 15, the third distribution headers 28a and 28b are similarly branched and merged.

  As in the first embodiment or the second embodiment, for example, the first flow path 22 through which the refrigerant circulating in the refrigeration cycle 100 flows is aluminum or aluminum in which a plurality of parallel flow paths are integrally formed and the outer shape is flat. The flat heat transfer tube 21 is made of an alloy. Although the 2nd flow path 23b and the 3rd flow path 24b are arrange | positioned facing the flat heat exchanger tube 21 arrange | positioned in the center part, in this Embodiment especially on the flat both surfaces where the flat heat exchanger tube 21 opposes. The second flow path 23b and the third flow path 24b are alternately arranged to face each other. That is, a circular heat transfer tube constituting the second flow path 23b is disposed below the flat heat transfer tube 21 at the left end as viewed in FIG. A circular heat transfer tube constituting the three flow paths 24b is arranged. And the circular heat exchanger tube which comprises the 3rd flow path 24b is arrange | positioned next to the circular heat exchanger tube which comprises the 2nd flow path 23b. As described above, the circular heat transfer tubes constituting the second flow path 23b and the circular heat transfer tubes constituting the third flow path 24b are alternately arranged.

  Each of the second flow path 23b and the third flow path 24b is a circular heat transfer tube made of, for example, a plurality of copper or stainless steel, and the heat conductive resin 25 includes the flat heat transfer tube 21, the second flow path 23b, and the like. The third flow path 24b is surrounded and integrated.

  In the hot water supply and regenerative integrated heat exchanger 2b configured in this way, a plurality of flow paths constituting the second flow path 23b and the third flow path 24b are alternately arranged on both surfaces of the flat heat transfer tube 21. The second flow path 23b and the third flow path 24b are close to each other. For this reason, in addition to the second embodiment, the heat of the second heat medium that circulates through the second flow path 23b, for example, hot water, and the third heat medium that circulates through the third flow path 24b, for example, bath water. Exchange amount can be increased. Moreover, regarding the heat exchange between the refrigerant and the hot water or between the refrigerant and the bath water, as in the second embodiment, heat can be exchanged efficiently.

  Further, in the heat pump water heater using the hot water supply reheating integrated heat exchanger 2b of the present embodiment, when performing the second bathtub reheating method using the high temperature water in the hot water supply tank 10 as a heat source, the first embodiment or Compared to the configuration of the second embodiment, the distance between the bath water channel 24b and the hot water channel 23b can be reduced, and good heat exchange performance can be ensured.

  Moreover, FIG. 11 is sectional drawing which shows another structural example of the heat exchanger 2b which concerns on this Embodiment. Here, the plurality of flow paths constituting the second flow path 23b and the third flow path 24b are rectangular flow paths, and are made of, for example, copper or stainless steel. The flat heat transfer tube 21, the second flow path 23b, and the third flow path 24b are arranged in parallel, and the distance L between the heat transfer tubes facing each of the three flow paths 22, 23b, 24b is substantially the same. That is, since the width of the heat conductive resin filled between the flat heat transfer tube 21 and the second flow channel 23b and between the flat heat transfer tube 21 and the third flow channel 24b can be made uniform, the heat transfer resin is configured by a circular heat transfer tube. As a result, the heat exchange performance can be further improved.

  In addition, as shown in FIG. 12, the first flow path 22, which is the flow path for the refrigerant, may not be formed integrally with the flat heat transfer tube 21 but may be formed by a plurality of rectangular tubes. A large area in the pipe of the first flow path 22 through which the refrigerant flows can be secured, and the amount of heat exchange can be improved. Moreover, the 1st flow path 22 does not need to be arranged in the center. The first flow path 22, the second flow path 23 b, and the third flow path 24 b may be separated and arranged in three rows or a plurality of rows and integrated with the heat conductive resin 25. This arrangement may be determined in consideration of the operation of the heat pump water heater. For example, the operation of storing the heat in the hot water supply tank 10 of the hot water supply circuit 12 is most frequently performed using the refrigerant of the refrigeration cycle 100 as the heat source, and the bath reheating operation is performed using the heat of heat in the hot water supply tank 10 of the hot water supply circuit 12 as a heat source. Next, it is frequently performed, and it is assumed that the bathtub reheating operation using the refrigerant of the refrigeration cycle 100 as a heat source is not so frequent. In this case, the first and second flow paths are arranged so that the heat exchange performance of the first flow path 22 through which the refrigerant flows and the second flow path 23b through which the hot water flows is the best, and then the hot water flows through the second flow path. What is necessary is just to arrange | position a 2nd, 3rd flow path so that the heat exchange performance of the 2nd flow path 23b and the 3rd flow path 24b through which bathtub water flows may improve.

  In FIG. 12, any or all of the flow paths may be configured by circular pipes. In the case where the heat transfer tubes are formed of rectangular tubes, the distance between the rectangular tubes can be made uniform, so that there is an effect that heat exchange is performed uniformly and heat loss can be reduced. On the other hand, when the heat transfer tube is formed of a circular tube, the water pressure applied to the wall of the circular tube can be made uniform, so that deformation due to the water pressure is suppressed, and there is an effect that the heat conductive resin can be prevented from being destroyed.

In addition, although the second flow path 23b and the third flow path 24b are alternately arranged on both sides of the first flow path 22 disposed in the center, the present invention is not limited to this. The second flow paths 23b may not be disposed alternately, and the second flow paths 23b may be disposed every third or every third flow path 24b, and vice versa. You may arrange every 2 or 3 with respect to the path 23b. What is necessary is just to provide so that it may mix in the both sides of the 1st flow path 22 arrange | positioned in a center part.
Moreover, you may change the diameter of a heat exchanger tube suitably. For example, when the second flow path 23b is arranged every second or every third flow path with respect to the third flow path 24b, the heat transfer tube diameter of the second flow path 23b is made larger than the heat transfer tube diameter of the third flow path 24b. Also, the heat exchange amount of the heat transfer tubes may be made different.

In this way, each of the second flow path 23b and the third flow path 24b is constituted by a plurality of heat transfer tubes, and the heat transfer tubes constituting the second flow path 23b and the heat transfer tubes constituting the third flow path 24b are flattened. By providing the heat transfer tubes 21 so as to be mixed on both sides of the flat surfaces facing each other, no matter which heat medium is selected from the first, second and third heat mediums, heat exchange can be performed. A heat exchanger that can ensure performance is obtained.
In particular, the heat transfer tubes constituting the second flow path 23b and the heat transfer tubes constituting the third flow path 24b are alternately provided close to both sides of the flat surface facing the flat heat transfer tube 21, thereby providing the first, first, A heat exchanger capable of ensuring heat exchange performance can be obtained no matter which heat medium is selected and exchanged between any two of the second and third heat mediums.
In addition, the first flow path 22 is formed as one rectangular flat heat transfer tube 21, and each of the second flow path 23b and the third flow path 24b is composed of a plurality of rectangular tubes, thereby reducing the distance between the rectangular tubes. A heat exchanger with uniform heat transfer performance can be obtained.

The compressor 1, the heat exchanger 2b that operates as a radiator, the expansion valve 3, and the evaporator 4 are connected in an annular shape to circulate the refrigerant, the hot water tank 10, the heat exchanger, and the hot water pump. A hot water supply circuit 12 that circulates water by connecting 11 in an annular shape, and a heat utilization circuit 15 that circulates a heat medium by connecting the heat exchanger 2b and the reheating pump 14 in an annular shape, Any one of the heat exchangers 2b described in the third embodiment, the high-temperature refrigerant discharged from the compressor 1 of the refrigeration cycle 100 is circulated through the first flow path 22 of the heat exchanger 2b, and the second flow path 23b. The water that circulates in the hot water supply circuit 12 is circulated and the heat exchanger 2b that circulates the heat utilization circuit 15 is circulated in the third flow path 24b. Used for heat exchange performance Heat pump water heater can be obtained.
Further, in other effects, the same configuration as in the first embodiment provides the same effect as in the first embodiment by the same configuration as in the first embodiment.

  Also in the first embodiment or the second embodiment, the first flow path 22 is configured by the flat heat transfer tube 21 by integrating a plurality of flow paths, but is not limited thereto. For example, as shown in FIG. 12, it may be configured by a plurality of rectangular or circular heat transfer tubes and integrated by a heat conductive resin 25. However, it is desirable that the material is composed of a heat transfer tube such as aluminum having a good thermal conductivity because the heat exchange efficiency is good. Further, if the flow path through which the refrigerant flows is made of aluminum or an aluminum alloy having corrosion resistance to the refrigerant, a heat exchanger that is resistant to secular change can be obtained. Moreover, when manufacturing the heat exchanger, if the 1st flow path 22 is comprised with the flat heat exchanger tube 21, since the 1st flow path 22 can be handled collectively, it will be easy to handle.

In the first to third embodiments, the cross-sectional shape of the heat transfer tube is circular or rectangular, but the circular heat transfer tube includes an elliptical heat transfer tube, and the rectangular heat transfer tube includes: It may have any square cross-sectional shape such as a rhombus or a rectangle.
Moreover, although the 1st flow path 22, the 2nd flow path 23, and the 3rd flow path 24 are arrange | positioned in 1 row, you may comprise in multiple rows. For example, the first flow path 22 and the third flow path 24 may be further arranged below the second flow path 23 in FIG. Moreover, the 1st flow path 22, the 2nd flow path 23, and the 3rd flow path 24 do not need to be comprised by the linear heat exchanger tube. At least one of the first flow path 22, the second flow path 23, and the third flow path 24 is curvedly arranged between the inlet and the outlet, for example, in a U shape. Also good.

Embodiment 4 FIG.
FIG. 13: is a circuit block diagram which shows the heat pump water heater by Embodiment 4 of this invention. The heat pump water heater using any one of the heat exchangers 2, 2a, and 2b described in the first to third embodiments uses a refrigerant in the refrigeration cycle 100 as a heat source when performing a bath reheating operation. Both of the hot water supply hot water stored in the hot water supply tank 10 and the second hot water supply hot water stored in the hot water supply tank 10 can be used. In the present embodiment, a control method for controlling which bathtub reheating method is used will be described. Particularly in the present embodiment, the operation control of the heat pump water heater is performed according to the state of the remaining hot water amount in the hot water tank 10. In the present embodiment, parts that are not particularly described are the same as those in the first to third embodiments, and the same reference numerals denote the same or corresponding parts.

  In FIG. 13, the remaining hot water amount detecting means 31 for detecting the remaining hot water amount in the hot water supply tank 10 is configured to have two or more temperature detection elements (hereinafter referred to as thermistors) for detecting the temperature of the hot water supply tank 10, for example. . The thermistor 31 is fixed to the side surface of the hot water tank 10 at a plurality of locations on the upper and lower sides, and by detecting the temperature of the hot water tank 10 at each location, the water surface position in the hot water tank 10 can be detected. The amount of hot water can be detected. Moreover, the control apparatus 40 which comprises a control means is a microcomputer, for example, and shows an example of the control flowchart of the bathtub chasing operation performed with the control apparatus 40 in FIG.

Based on FIG. 14, the control process of the bathtub follow-up operation will be described. In a general hot water supply system, the refrigeration cycle 100 and the hot water supply circuit 12 are operated using inexpensive electric power in the late-night power hours, for example, a hot water supply tank 10 having a capacity of about 400 liters is filled with hot water of about 90 ° C. And use it in the bathroom, kitchen or bathroom the next day. Bathtub reheating operation is required when the temperature of the bath water has dropped, and the next day the bath water of the previous day or the bath water put in the evening at night may be warmed. Is necessary.
When receiving a bathtub follow-up command according to an instruction from the user or the system (ST1), the thermistor 31 detects temperatures at a plurality of positions in the vertical direction of the hot water supply tank 10 (ST2). The remaining hot water amount Qtank in the hot water supply tank 10 is calculated from the temperatures at a plurality of positions in the vertical direction of the hot water supply tank 10 (ST3). For example, if the thermistor 31 can detect the temperature at five positions, the second temperature from the top is 90 ° C., and the third temperature from the top is 20 ° C., the hot water tank 10 is between the second and third. There will be an interface between the hot water inside and the low-temperature water supplied. In this way, the remaining hot water amount Qtank of the hot water supply tank 10 is calculated, and it is determined in ST4 whether the remaining hot water amount Qtank is smaller than a preset remaining hot water amount. The amount of remaining hot water set in advance is, for example, 1/3 of the remaining hot water in the hot water supply tank 10.

  If it is determined in ST4 that the detected remaining hot water amount Qtank is smaller than a preset remaining hot water amount, the first bathtub reheating method using the refrigerant circulating in the refrigeration cycle 100 as a heat source is selected (ST5). Then, an operation command is issued to the compressor 1, the expansion valve 3, the blower 5, and the reheating pump 14 constituting the refrigeration cycle 100, and the bathtub renewal operation is started (ST6).

  If it is determined in ST4 that the detected remaining hot water amount Qtank is equal to or greater than a preset remaining hot water amount, a second bathtub reheating method using hot water in the hot water supply tank 10 as a heat source is selected (ST7). Then, an operation command is issued to the hot water supply pump 11 and the reheating pump 14, and the bathtub renewal operation is started (ST8).

  As described above, when the amount of remaining hot water in the hot water supply tank 10 is small, the hot water in the hot water supply tank 10 is not used as a heat source, so that the hot water supply tank 10 can be prevented from running out.

  The amount of remaining hot water set in advance is not fixed, and may be variable according to time, for example. In normal use, hot water used in a day is stored in the hot water supply tank 10 in the morning. Therefore, in the morning, it is assumed that the remaining hot water amount in the hot water supply tank 10 is 4/5 or more. When the remaining hot water amount is less than 4/5, the reheating operation is performed using the refrigeration cycle 100. Furthermore, when the amount of remaining hot water in the hot water supply tank 10 is required to be 2/3 or more at the afternoon, the refrigeration cycle 100 is used when the remaining hot water amount is less than 2/3. At night, hot water is not required so much, so the refrigeration cycle 100 is used when the amount of remaining hot water is less than 1/3. As described above, the amount of remaining hot water in the hot water supply tank 10 serving as a threshold when the refrigeration cycle is used may be variably set according to the daily usage pattern of the user.

  In addition, although the remaining hot water amount detection means 31 for detecting the remaining hot water amount in the hot water supply tank 10 is composed of a plurality of thermistors, only one is possible. By attaching a thermistor near the position corresponding to the predetermined remaining hot water volume and detecting that the temperature has become low, it is possible to detect the time point when the temperature becomes lower than the predetermined remaining hot water volume. Further, the remaining hot water amount may be detected by another method instead of the thermistor for detecting the temperature of the side surface of the hot water supply tank 10.

  In the present embodiment, as described above, for example, a hot water use operation in which the heat source required in the hot water use circuit 15 such as a reheating circuit is the hot water in the hot water supply tank 10, and the heat source required in the hot heat use circuit 15 is frozen. Heat pump hot water supply that can be operated with energy saving when hot water is obtained in the heat utilization circuit 15 and the hot water in the hot water supply tank 10 is used. A machine is obtained.

  Moreover, when the remaining hot water amount detecting means 31 for detecting the remaining hot water amount in the hot water supply tank 10 and the remaining hot water amount in the hot water supply tank 10 detected by the remaining hot water amount detecting means 31 are smaller than a preset remaining hot water amount, the operation using the refrigeration cycle is performed. By providing the control means 40, a heat pump water heater capable of preventing the hot water in the hot water tank from running out is obtained.

  In particular, as described in the first to third embodiments, the first flow path 22 through which the first heat medium flows and the first flow path 22 are provided close to each other, and the second heat medium is provided. The second flow path 23 that circulates, the third flow path 24 that is provided in the vicinity of the first flow path 22 or the second flow path 23 and that circulates the third heat medium, and has thermal conductivity, A heat conductive resin 25 that surrounds and integrates the first flow path 22, the second flow path 23, and the third flow path 24, and the first heat medium and the second flow that flow through the first flow path 22. Heat exchange with the second heat medium flowing through the passage 23, heat exchange between the first heat medium flowing through the first flow path 22 and the third heat medium flowing through the third flow path 24, and By providing the heat exchanger 2 characterized in that heat exchange between the second heat medium flowing through the second flow path 23 and the third heat medium flowing through the third flow path 24 is possible, In addition to heat exchange between the refrigerant circulating in the water 100 and hot water circulating in the hot water circuit 12, heat exchange between the refrigerant circulating in the refrigeration cycle 100 and the bath water circulating in the additional circuit 15, and the hot water circuit Heat exchange of hot water circulating through 12 and bath water circulating through the reheating circuit 15 becomes possible, and a heat pump water heater having various operation methods such as a first bathtub reheating operation and a second bathtub reheating operation is realized. did. Furthermore, by performing the control as described herein, it is possible to realize a device that can satisfy the user's request as a heat pump water heater and can reduce the energy used.

Embodiment 5 FIG.
FIG. 15 is a circuit configuration diagram showing a heat pump water heater according to Embodiment 5 of the present invention. The present embodiment is a heat pump water heater using any one of the heat exchangers 2, 2a, 2b described in the first to third embodiments, and is an operation control method different from the fourth embodiment. Will be described. In the present embodiment, parts that are not particularly described are the same as those in the first to third embodiments, and the same reference numerals denote the same or corresponding parts.

  In FIG. 15, for example, the time detection means 32 is included in the control device 40. The control device 40 selects whether to perform the first bathtub follow-up operation or the second bathtub follow-up operation according to the time at which the bathtub follow-up operation is performed. An example of a control flowchart of the bathtub chasing operation in the present embodiment is shown in FIG. In recent years, different electric charges have been set according to time. In consideration of this power charge system, control for performing a bathtub renewal operation is shown so that the power charge is as low as possible.

Based on FIG. 16, the control process of the bathtub follow-up operation will be described.
When the bathtub follow-up command is received by an instruction from the user or the system (ST1), the bath follow-up command time T is detected by the time detection means 32 built in the control device 40 (ST9).

  It is determined whether or not this bathtub renewal command time T is an inexpensive time zone of the electricity rate determined by the electricity rate system applied to the heat pump water heater such as the hourly rate system, here the late-night electricity time zone. (ST10). If it is determined in ST10 that the detected bathtub reheating instruction time T is in the midnight power time zone, the first bathtub reheating method using the refrigerant as a heat source is selected (ST5). Then, an operation command is issued to the compressor 1, the expansion valve 3, the blower 5, and the reheating pump 14 constituting the refrigeration cycle 100, and the bathtub renewal operation is started (ST6).

  If it is determined in ST10 that it is outside the midnight power time zone, the second bathtub reheating method using hot water in the hot water supply tank 10 as a heat source is selected (ST7). Then, an operation command is issued to the hot water supply pump 11 and the reheating pump 14, and the bathtub renewal operation is started (ST8).

Comparing the amount of power required for the operation of the refrigeration cycle 100 with the amount of power required for the operation of the hot water supply circuit 12, the refrigeration cycle 100 that operates the compressor 1 and the blower 5 requires a larger amount of power. . For this reason, in the late-night power hours when the electricity rate is low, the first bath reheating operation is performed using the refrigeration cycle as a heat source, and in the time zone other than the late-night electricity hours where the electricity rate is high, the late-night electricity where the electricity rate is low The second bathtub reheating operation is performed using the high-temperature water in the hot water tank 10 boiled up in the time zone as a heat source. By controlling in this way, a chasing operation can be realized at a low operation cost.
In such a hot water supply system, warm water for the next day must be stored in the water supply tank 10 at night. Therefore, at night, the refrigeration cycle 100 is operated without using the hot water in the hot water tank 10 to perform the bathtub reheating operation, so that the hot water in the hot water tank 10 is stored for use the next day. be able to. By operating in this way, hot water can be stably supplied the next day.

  Further, as shown in FIG. 17, the control may be performed by combining Embodiment 4 and FIG. In this heat pump water heater, both the thermistor 31 and the time detection means 32 for detecting the time when the bathtub follow-up operation is required are required as the remaining hot water detection means for detecting the remaining hot water amount in the hot water supply tank 10. In ST4 of FIG. 17, when the remaining hot water amount Qtank in the hot water supply tank 10 is smaller than the set remaining hot water amount, the refrigeration cycle 100 is operated and the first bathtub reheating operation is performed.

  If the remaining hot water amount Qtank in the hot water supply tank 10 is larger than the set remaining hot water amount in ST4, it is determined whether or not the bath chase command time T is a late-night power time zone where the power rate is low (ST10). Here, when the bathtub follow-up command time T is in the midnight power time zone, the first bathtub follow-up operation (ST5, ST6) is performed by the refrigeration cycle 100, and the bathtub follow-up command time T is not in the midnight power time zone. The second bathtub pursuit operation (ST7, ST8) with hot water in the hot water supply tank 10 is performed.

  In this control step, first, the amount of remaining hot water in the hot water supply tank 10 is determined. When the remaining hot water amount is small, the hot water in the hot water supply tank 10 is not used, so that the hot water in the hot water supply tank 10 can be prevented from running out. Furthermore, since the bathtub chasing operation is performed in consideration of the electric power charge, the chasing operation can be realized at a low operation cost.

  In the present embodiment, the midnight power time zone is an inexpensive time zone in the power rate system applied to the heat pump water heater such as the hourly rate system. In ST10 of FIGS. 16 and 17, it is determined whether or not the detected bathtub chasing command time T is in the late-night power time zone, and one of the first and second bathtub chasing methods is selected. Here, if the electricity rate system is changed and the electricity rate is cheaper than the midnight electricity time zone in other time zones, it is determined whether it is an inexpensive time zone set in that rate system. In the case of an inexpensive time zone, it may be controlled to perform the refrigeration cycle utilization operation.

  In the present embodiment, as described above, for example, a hot water use operation in which the heat source required in the hot water use circuit 15 such as a reheating circuit is the hot water in the hot water supply tank 10, and the heat source required in the hot heat use circuit 15 is frozen. By using the refrigeration cycle utilization operation by the cycle 100, a heat pump water heater that can be operated with energy saving when the heat utilization circuit 15 obtains heat as needed and uses hot water in the hot water tank 10 is obtained. It is done.

  In addition, when the time detection means 32 for detecting the time and the time detected by the time detection means 32 are in a time zone where the power charge is inexpensive, the refrigeration cycle utilization operation by the refrigeration cycle 100 is used as the heat source required for the thermal utilization circuit 15. By providing the control means 40 that performs the above, a heat pump water heater that can effectively use low-priced power and reduce the operating cost can be obtained.

  In addition, when the remaining hot water amount detecting means 31 for detecting the remaining hot water amount in the hot water supply tank 10 and the remaining hot water amount in the hot water supply tank 10 detected by the remaining hot water amount detecting means 31 are smaller than a preset remaining hot water amount, the refrigeration cycle utilization operation is performed. By providing the control means 40 for performing the above, a heat pump water heater can be obtained in which hot water in the hot water tank can be prevented from running out and the operating cost can be reduced.

  In particular, similar to the fourth embodiment, as described in the first to third embodiments, the first flow path 22 through which the first heat medium flows and the first flow path 22 are provided close to each other. The second flow path 23 through which the second heat medium flows, the third flow path 24 provided close to the first flow path 22 or the second flow path 23 and through which the third heat medium flows, and heat A heat conductive resin 25 that has conductivity and surrounds and integrates the first flow path 22, the second flow path 23, and the third flow path 24, and flows through the first flow path 22. Heat exchange between the first heat medium flowing through the second flow path 23 and the second heat medium flowing through the second flow path 23, and the first heat medium flowing through the first flow path 22 and the third heat medium flowing through the third flow path 24. A heat exchanger 2 is provided that is capable of exchanging heat and that can exchange heat between the second heat medium flowing through the second flow path 23 and the third heat medium flowing through the third flow path 24. Thus, in addition to heat exchange between the refrigerant circulating in the refrigeration cycle 100 and hot water supply water circulating in the hot water supply circuit 12, heat exchange between the refrigerant circulating in the refrigeration cycle 100 and the bath water circulating in the tracking circuit 15 is performed. , And heat exchange of hot water that circulates in the hot water supply circuit 12 and bath water that circulates in the reheating circuit 15 are possible, and there are various operation methods such as the first bathtub reheating operation and the second bathtub reheating operation. A heat pump water heater was realized. Furthermore, by performing the control as described herein, it is possible to realize a device that can satisfy the user's request as a heat pump water heater and can reduce the energy used.

  In each of the first to fifth embodiments, the bathtub chasing operation having a chasing circuit as the heat utilizing circuit has been described. However, a heat utilizing circuit that uses the heat in the floor heating panel may be configured. . If the bathtub 13 of the chasing circuit is replaced with a floor heating panel, the same effect can be obtained for the floor heating operation. Moreover, you may connect the heat utilization circuit which utilizes not only a floor heating panel but a heating panel for heating a room. Further, in the case of such a heating panel, an antifreeze liquid such as brine may be circulated as a heat medium.

  Moreover, it is good also as a structure which has two or more heat utilization circuits. When two or more heat utilization circuits are provided, the same configuration as the heat exchanger according to any one of the first to third embodiments is used, and four or more flow paths through which four or more heat media are circulated are provided. If the heat conductive resin 25 is provided so as to surround the heat exchanger, heat exchange can be performed between any two heat mediums according to the state of operation.

  Further, in the two heat mediums that flow through the heat exchanger and exchange heat, if the inflow and outflow directions are configured so that the temperature changes are parallel, heat exchange is performed efficiently at each part in the heat exchanger. . For example, in FIG. 1, when operating the refrigeration cycle 100 and the reheating circuit 15, the refrigerating cycle 100 may be circulated from top to bottom as viewed in the figure, and the reheating circuit 15 may be circulated from bottom to top. In FIG. 1, when the hot water supply circuit 12 and the chasing circuit 15 are operated, the hot water circuit 12 may be circulated from the top to the bottom, and the chasing circuit 15 may be circulated from the bottom to the top. In addition, when operating the hot water supply circuit 12 and the refrigeration cycle 100, it is better to allow the hot water supply pump 11 to flow in the reverse direction, for example, by reversely rotating the hot water supply pump 11 in consideration of temperature changes.

In the first to fifth embodiments, the refrigerant circulating in the refrigeration cycle 100 includes, for example, R407C, R404A, R507A, and the like as HFC refrigerants in addition to R410A having an ozone destruction coefficient of 0. Further, from the viewpoint of preventing global warming, a mixed refrigerant such as R32 alone, R152a alone, or R32 / R132a, which is an HFC refrigerant having a small global warming potential, may be used. In addition, the natural refrigerant may be a hydrocarbon such as propane, butane, or isobutane, ammonia, carbon dioxide, or the like.
In particular, when carbon dioxide or hydrocarbons are used, there is a global environmental conservation effect. As the heat pump water heater, when the inlet temperature of the heat medium that exchanges heat with the refrigerant in the heat exchanger 2 is high, the heat exchange efficiency is better than when the HFC refrigerant and the HC refrigerant are carbon dioxide. On the other hand, when the inlet temperature when flowing into the heat exchanger 2 is low, carbon dioxide has better heat exchange efficiency than HFC refrigerant and HC refrigerant. For example, since bath water having a temperature of about 38 ° C. circulates in the reheating operation, the inlet temperature is higher than that of tap water, and a reheating operation with good heat exchange efficiency can be achieved by using HFC refrigerant and HC refrigerant. On the other hand, in the hot water tank heating operation, tap water of about 10 ° C. flows into the heat exchanger 2, so that the inlet temperature is low and heat exchange efficiency is good when carbon dioxide is used as a refrigerant.

It is a circuit block diagram which shows the heat pump water heater by Embodiment 1 of this invention. It is a perspective view which decomposes | disassembles and shows the structure of the heat pump water heater which shows an example of Embodiment 1 of this invention. It is a perspective view which shows the heat exchanger which concerns on Embodiment 1 of this invention. It is a figure which shows the cross section of the heat exchanger which concerns on Embodiment 1 of this invention in detail, and is a longitudinal cross-sectional view in the PP line of FIG. It is sectional drawing which shows the heat exchanger of another structural example which concerns on Embodiment 1 of this invention. It is a side view which shows the heat exchanger of another structural example which concerns on Embodiment 1 of this invention. It is a perspective view which shows the heat exchanger which concerns on Embodiment 2 of this invention. It is a figure which shows the cross section of the heat exchanger which concerns on Embodiment 2 of this invention in detail, and is a longitudinal cross-sectional view in the QQ line of FIG. It is a perspective view which shows the heat exchanger which concerns on Embodiment 3 of this invention. It is a figure which shows the cross section of the heat exchanger which concerns on Embodiment 3 of this invention in detail, and is a longitudinal cross-sectional view in the RR line | wire of FIG. It is sectional drawing which shows another heat exchanger which concerns on Embodiment 3 of this invention. It is sectional drawing which shows another heat exchanger which concerns on Embodiment 3 of this invention. It is a circuit block diagram which shows the heat pump water heater by Embodiment 4 of this invention. It is an example of the control flowchart which shows the chasing operation which concerns on Embodiment 4 of this invention. It is a circuit block diagram which shows the heat pump water heater by Embodiment 5 of this invention. It is an example of the control flowchart which shows the chasing operation which concerns on Embodiment 5 of this invention. It is another example of the control flowchart which shows the chasing operation which concerns on Embodiment 5 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 2, 2a, 2b Heat exchanger 3 Expansion valve 4 Evaporator 10 Hot-water supply tank 11 Hot-water supply pump 12 Hot-water supply water circuit 13 Bathtub 14 Reheating pump 15 Reheating circuit 21 Flat heat exchanger tube 22 1st flow path 23, 23a, 23b 2nd flow path 24, 24a, 24b 3rd flow path 25 Thermally conductive resin 31 Thermistor 32 Time detection means 40 Control apparatus

Claims (14)

A first flow path through which the first heat medium flows, a second flow path provided near the first flow path and through which the second heat medium flows, and the first flow path or the second flow. A third flow path that is provided close to the path and through which the third heat medium flows, has thermal conductivity, and surrounds the first flow path, the second flow path, and the third flow path. A heat conductive resin to be integrated, wherein heat exchange is possible between the first heat medium flowing through the first flow path and the second heat medium flowing through the second flow path, and the first flow path is Heat exchange is possible between the flowing first heat medium and the third heat medium flowing through the third flow path, and further, the second heat medium flowing through the second flow path and the third heat medium flowing through the third flow path A heat exchanger capable of exchanging heat with a heat medium. A first flow path, a second flow path, and a third flow path that flow substantially in parallel to each other, the first flow path through which the first heat medium flows, and the flow direction of the first flow path Provided in the vicinity of a substantially vertical direction and provided in the vicinity of the second flow path through which the second heat medium flows, and on the substantially opposite side of the second flow path with respect to the first flow path. The third flow path through which the heat medium 3 circulates, and a heat conductive resin having thermal conductivity and surrounding and integrating the first flow path, the second flow path, and the third flow path. The first heat medium flowing through the first flow path and the second heat medium flowing through the second flow path are heat exchangeable, and the first heat medium flowing through the first flow path and the Heat exchange can be performed with the third heat medium flowing through the third flow path, and the second heat medium flowing through the second flow path and the third heat medium flowing through the third flow path can be converted into the thermal conductivity. resin Heat exchanger, characterized in that to enable heat exchange through. At least one of the first flow path, the second flow path, and the third flow path is configured by one or a plurality of heat transfer tubes, and a cross-sectional shape perpendicular to the flow path of the heat transfer tubes is The heat exchanger according to claim 1, wherein the heat exchanger has a rectangular shape or a circular shape. The first heat medium flowing through the first flow path is a refrigerant, and the first flow path is a flat heat transfer tube having a plurality of flow paths arranged in parallel and having a flat outer shape. The heat exchanger according to any one of claims 1 to 3. The second flow path is provided close to one side of the flat surface facing the flat heat transfer tube, and the third flow path is set close to the other side of the flat surface facing the flat heat transfer tube. The heat exchanger according to claim 4. Each of the second flow path and the third flow path is composed of a plurality of heat transfer tubes, and the heat transfer tubes forming the second flow paths and the heat transfer tubes forming the third flow paths are made of the flat heat transfer tubes. The heat exchanger according to claim 4, wherein the heat exchanger is provided so as to be mixed on both sides of the flat surfaces facing each other. The heat exchanger according to any one of claims 1 to 6, wherein at least one of the second flow path and the third flow path is made of copper or stainless steel. . 8. The heat conductive resin according to claim 1, wherein the heat conductive resin is a mixture of a resin and a metal powder or a mixture of a resin and carbon, and has a thermal conductivity of 10 W / mK or more. The described heat exchanger. A compressor, a heat exchanger that operates as a radiator, an expansion valve, and an evaporator are connected in a ring to circulate the refrigerant, and a hot water tank, the heat exchanger, and a hot water pump are connected in a ring to form water. A hot water supply circuit for circulating the heat and a heat utilization circuit for circulating the heat medium by connecting the heat exchanger and the circulation pump in a ring shape, and the heat exchanger is any one of claims 1 to 8. The heat exchanger according to claim 1, wherein a high-temperature refrigerant discharged from the compressor of the refrigeration cycle is circulated through the first flow path of the heat exchanger, and the second flow path and the third flow path. A heat pump water heater, wherein water circulating through the hot water supply circuit is circulated through any one of the flow paths, and a heat medium circulating through the thermal utilization circuit is circulated through the other flow path. The hot water utilization circuit connects a bathtub and circulates bathtub water as the heating medium, and exchanges heat with the refrigerant circulating in the refrigeration cycle or the hot water circulating in the hot water supply circuit in the heat exchanger, and the bathtub water. The heat pump water heater according to claim 9, wherein the heat pump water heater is a reheating circuit that raises the temperature of the heat pump. A hot water use operation in which the heat source required in the heat use circuit is hot water in the hot water tank, and a refrigeration cycle use operation in which the heat source required in the heat use circuit is a refrigerant of the refrigeration cycle. The heat pump water heater according to claim 9 or 10, characterized in that Remaining hot water amount detecting means for detecting the remaining hot water amount in the hot water supply tank, and control means for performing the operation using the refrigeration cycle when the remaining hot water amount in the hot water tank detected by the remaining hot water amount detecting means is less than a preset remaining hot water amount. And a heat pump water heater according to claim 11. The time detection means for detecting the time, and the control means for performing the refrigeration cycle utilization operation when the time detected by the time detection means is an inexpensive time zone of the power charge. A heat pump water heater according to claim 11 or claim 12. The heat pump water heater according to any one of claims 9 to 13, wherein the refrigerant circulating in the refrigeration cycle is carbon dioxide, hydrocarbon, or HFC refrigerant.

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