JP4367350B2 - Heat pump water heater - Google Patents

Description

  The present invention relates to a heat pump water heater.

  As a conventional heat pump hot water supply apparatus, as shown in FIG. 7, reference numeral 1 denotes a refrigerant circuit in which refrigerant circulates and performs a heat pump cycle operation. In this refrigerant circuit 1, a compressor 2, a refrigerant-to-water heat exchanger 3, and an evaporator 4 are used. Including. 5 is a hot water storage tank for storing hot water heated by the refrigerant-to-water heat exchanger 3, 6 is a hot water pipe provided at the top of the hot water storage tank 5, and 7 is hot water for extracting hot water from the top of the hot water storage tank 5. Reference numeral 8 denotes a hot water return path that communicates with the hot water path 7 and returns the hot water to the hot water storage tank 5, and 9 is a circulation pump that is located between the hot water path 7 and the hot water return path 8 and drives the hot water. Reference numeral 10 denotes an intermediate hot water pipe provided adjacent to the hot water return path 8.

  11 is a heat medium circuit including the heat radiating terminal 12, 13 is a pump for driving the heat medium in the heat medium circuit, and 14 is a heat exchange for exchanging heat between the hot water from the hot water path 7 and the heat medium of the heat medium circuit. It is a vessel.

In this way, the hot water in the hot water storage tank 5 flows from the hot water passage 7 by the circulation pump 9, exchanges heat with the heat medium in the heat exchanger 14, decreases in temperature, and is returned from the hot water return passage 8 to the hot water storage tank 5. On the other hand, the heat medium that has received heat from the hot water in the hot water storage tank 5 by the heat exchanger 14 reaches a predetermined temperature, and is supplied to the heat radiating terminal 12 through the heat medium circuit 11 to dissipate heat so that, for example, a heating function can be provided to the user. It was. Then, when hot water is supplied, hot water is discharged from the hot water storage tank 5 by selectively using the hot water discharge pipe 6 or the intermediate hot water discharge pipe 10 according to the hot water temperature returned from the hot water return path 8 to the hot water storage tank 5 (for example, patents). Reference 1).
JP 2002-243274 A

  However, in the above-described conventional heat pump hot water supply apparatus, the hot water returned from the hot water return path to the hot water storage tank is subjected to heat exchange to lower the temperature, and becomes so-called medium hot water. Therefore, if it is left as it is, the hot pump runs out due to a decrease in the amount of stored heat in the hot water storage tank, and the heat pump cycle pressure increases due to a rise in the inlet temperature of the refrigerant-to-water heat exchanger and the efficiency decreases.

  Therefore, it may be possible to improve the energy efficiency by using the intermediate hot water pipe to preheat this medium-temperature water, but in case the user requests hot water immediately after a long heating operation, the hot water storage will not run out. It was necessary to secure the amount of heat, and there was a problem that the hot water storage tank was enlarged. In particular, when the inside of the hot water tank corresponding to the hot water return path is at a low temperature, when this medium hot water is returned to the hot water tank, it is mixed and the mixed layer expands, and the hot water tank reheats the mixed layer by the heat pump cycle. For this reason, there is a problem that the heat pump cycle efficiency becomes very poor when boiling the medium temperature water to a high temperature.

  Therefore, the present invention solves the above-described conventional problems, and provides a high-performance heat pump hot water supply apparatus without running out of hot water or reducing heat pump cycle efficiency.

In order to solve the conventional problems, a heat pump water heater of the present invention includes a hot water storage tank, a refrigerant circulation circuit including a compressor and a radiator, a water / refrigerant heat exchanger in heat exchange relation with the radiator. A stacking pump for heating the water taken out from the bottom of the hot water storage tank through the water / refrigerant heat exchanger and returning it to the upper part of the hot water storage tank; A hot water pump that returns to the lower part of the hot water storage tank, a water supply pipe that supplies water from the lower part of the hot water storage tank, and a first water that exchanges heat flowing out from the heat dissipation heat exchanger and flows to the lower part of the hot water storage tank Heat storage means comprising at least a second water flow path for heat exchange with the water supplied from the water supply pipe and water supplied from the water supply pipe, and a hot water discharge pipe for discharging hot water stored in the hot water storage tank. At the top of And a hot water bypass pipe connecting the second water flow path and the hot water pipe, and the heat storage means includes a heat storage plate containing a latent heat storage agent and a flow path formed by laminating the heat storage plate. Configured, the first flow channel and the second flow channel
And a plurality of these layers are alternately stacked .

  As a result, the heat storage means can exchange heat with water at 40 ° C. to 60 ° C. flowing out from the heat absorption means via the hot water return pipe, and can be suppressed to about 20 ° C. to 30 ° C., so that the water / refrigerant heat exchanger The water temperature at the inlet of the refrigerant can be kept low, and the COP drop of the refrigerant circuit can be prevented. Moreover, the heat taken in and the low temperature water from a water supply pipe can be heat-exchanged and used for hot water.

  According to the present invention, it is possible to provide a high-performance heat pump hot water supply apparatus without running out of hot water or reducing heat pump cycle efficiency.

A first aspect of the present invention is a refrigerant circulation circuit including a hot water storage tank, a compressor and a radiator, a water / refrigerant heat exchanger in a heat exchange relationship with the radiator, and water taken from the bottom of the hot water storage tank. A stacking pump that heats and returns to the upper part of the hot water storage tank through the water / refrigerant heat exchanger, and a hot water pump that returns hot water taken out from the upper part of the hot water storage tank to the lower part of the hot water storage tank through a heat radiation heat exchanger And a water supply pipe for supplying water from the lower part of the hot water storage tank , a first flow channel for exchanging heat flowing out from the heat dissipation heat exchanger and flowing to the lower part of the hot water storage tank, and water supplied from the water supply pipe A heat storage means comprising at least a second flowing water passage for exchanging heat with the hot water, and a hot water discharge pipe for discharging the hot water stored in the hot water storage tank provided at an upper portion of the hot water storage tank, and the second flowing water passage And the hot water pipe A hot water bypass pipe, and the heat storage means includes a heat storage plate containing a latent heat storage agent and a flow channel formed by stacking the heat storage plates, and the first flow channel and the second flow channel. And a plurality of these layers are alternately stacked .

  As a result, the temperature is lowered by heat exchange with the heat medium in the heat radiating heat exchanger, and the warm water having a medium temperature water, for example, 40 ° C. to 60 ° C., is further lowered to a relatively low temperature level, for example 20 ° C. to 30 ° C. Will be stored. For this reason, since there is no medium-temperature water in the hot water storage tank, the water / refrigerant heat exchanger input temperature of the heat pump cycle is low when the portion of the warm water returned from the hot water return pipe is boiled again. High-efficiency operation can be realized. Thus, even when there is no request for hot water supply from the user immediately after the long-time heating operation, it is possible to provide a high-efficiency heat pump hot-water supply device by lowering the intermediate temperature water.

Further, by effectively using the amount of heat corresponding to the temperature of the intermediate temperature water lowered by the heat storage means, it is possible to provide a heat pump hot water supply device that secures an effective amount of heat and does not run out of hot water .

As a result, since the latent heat storage agent absorbs latent heat near the melting point, the medium temperature water is subjected to heat exchange with the latent heat storage agent, and then the temperature drops to a predetermined relatively low temperature level corresponding to the melting point, and is stored in the hot water storage tank. Will be. In this way, a part of the amount of heat possessed by the intermediate warm water returned from the warm water return pipe is latently heat-stored through heat exchange and stored in the heat storage agent. When the heated water in the returned part is boiled again, the incoming temperature of the water / refrigerant heat exchanger of the heat pump cycle is low, and high efficiency operation of the heat pump cycle can be realized. In addition, the amount of heat stored in the heat storage means can be effectively used to preheat the water supply through the hot water bypass pipe, and a high-performance heat pump hot water supply device that achieves both high efficiency and compactness can be provided .

As a result, the first and second flow channels are formed only by the process of laminating the heat storage plates, and the complicated work process is eliminated and the manufacturing time is shortened .

In particular, according to the second invention, in the first heat pump hot water supply apparatus, the heat storage means is provided separately from the hot water storage tank.

As a result, the capacity of the heat storage means can be set according to the capacity and frequency of use of the heat radiating terminal, etc., so that the heat storage amount and the temperature level can be designed to optimum values, and a high-efficiency heat pump hot water supply device that does not run out of hot water can be provided. . Moreover, by installing separately, the installation property of a heat pump hot-water supply apparatus, maintainability, etc. can be improved, and a more reliable high-performance heat pump hot-water supply apparatus can be provided .

In particular, the third invention is that in the heat pump hot water supply apparatus according to any one of the first to second inventions, the refrigerant is carbon dioxide, and the pressure is equal to or higher than the critical pressure.

  According to the present embodiment, by setting the pressure to be equal to or higher than the critical pressure, the refrigerant carbon dioxide in the entire water / refrigerant heat exchanger is not condensed even if the temperature is lowered due to heat deprived by water. It is easy to form a temperature difference in the water, and the water can be efficiently heated to the required high temperature level, so it can be used for heat dissipation terminals that require a high temperature level, and the water / refrigerant heat exchanger water temperature can be lowered. By doing so, high-efficiency operation of the heat pump cycle can be realized, and a high-efficiency heat pump water heater can be provided.

( Reference Example 1 )
FIG. 1 is a system configuration diagram of a heat pump water heater in Reference Example 1 of the present invention, FIG. 2 is an enlarged view of a main part configuration of the heat pump water heater, and FIG. 3 is a heat storage density comparison diagram showing a heat storage amount per unit volume. .

  1 and 2, the refrigerant circulation circuit 20 includes a compressor 21, a radiator 22, a decompression unit 23, and a heat absorber 24. The refrigerant circulation circuit 20 constitutes a heat pump cycle, and encloses a refrigerant such as carbon dioxide whose refrigerant pressure on the high pressure side is equal to or higher than the critical pressure. Reference numeral 25 denotes a circulation pump, 26 denotes a hot water storage pipe for transporting hot water that has exchanged heat with the refrigerant flowing through the radiator 22, and 27 denotes a hot water storage tank that communicates with the hot water storage pipe 26. Tap water, which is water, is supplied and discharged from an outlet pipe 29 at the top. Reference numeral 30 denotes a water / refrigerant heat exchanger in which water sent from the lower part of the hot water storage tank 27 by the circulation pump 25 exchanges heat with the refrigerant in the radiator 22. In this water / refrigerant heat exchanger 30, the water reaches a predetermined high temperature. It is transported to the hot water storage tank 27 via the hot water storage pipe 26. A mixing valve 31 mixes hot water from the hot water supply pipe 29 and water supply from the water supply pipe 28, and hot water having a predetermined flow rate and temperature is sent to the hot water supply terminal 32 through the mixing valve 31.

  Reference numeral 33 denotes a hot water pipe which is connected to the hot water storage tank 27 provided in the upper part of the hot water storage tank 27 and through which high temperature hot water flows. Reference numeral 34 denotes a hot water return pipe which returns to the hot water storage tank 27 after the temperature of the hot water drops. , 35 is a heat radiation heat exchanger provided between the hot water going pipe 33 and the hot water return pipe 34. The hot water storage tank 27, the hot water going pipe 33, the radiating heat exchanger 35, and the hot water return pipe 34 constitute a hot water circuit 36, 37 is an electromagnetic valve of a flow rate adjusting means provided in the hot water circuit, and 38 is this hot water circuit. Is a hot water pump. Then, hot water is taken out from the hot water storage tank 27 via the hot water pipe 33 and sent to the heat radiating heat exchanger 35, and the hot water whose temperature is lowered by heat exchange in the radiating heat exchanger 35 is returned from the hot water return pipe 34 to the hot water storage tank 27. It is like that. Reference numeral 39 denotes a hot air cooler provided in the heat radiation heat exchanger 35 and serving as heat absorbing means for sending wind for absorbing heat from the hot water flowing through the heat radiation heat exchanger 35.

Reference numeral 40 denotes a latent heat storage section which is a heat storage means provided in the hot water storage tank 27 corresponding to the hot water return pipe 34. The latent heat storage section 40 contains a latent heat storage agent such as sodium sulfate hydrate. A heat storage plate 41 and a water passage 42 configured by stacking these heat storage plates 41 are included. The melting point of the latent heat storage agent contained in the heat storage plate 41 is set to be low, for example, set to around the annual average water temperature. 43 is a hot water bypass pipe communicating with the hot water pipe 29 provided corresponding to the latent heat storage section 40, and 44 is a bypass flow rate solenoid valve for adjusting the flow rate provided in the hot water bypass pipe 43.

  In the heat storage density comparison diagram of FIG. 3, the horizontal axis represents the operating temperature, and the vertical axis represents the heat storage amount per unit volume. In the figure, the amount of heat storage with respect to the temperature of water and sodium sulfate hydrate is displayed in a graph. In the case of sodium sulfate hydrate, the calculation was performed assuming that the ratio (filling rate) of sodium sulfate hydrate filled in a unit volume was 74% and the remaining 26% was water. In the figure, the melting point of the used sodium sulfate hydrate is 32 ° C., but this example is not limited to the melting point.

  Next, the operation and action will be described. When the hot air blower 39 is operated, in the hot water circuit 36, the electromagnetic valve 37 as the flow rate adjusting means opens at a predetermined opening, and the hot water pump 38 is radiated from the hot water storage tank 27 to the heat dissipation heat exchanger. High temperature, for example, 80 ° C. to 90 ° C. hot water is sent to 35. And by the drive of the warm air machine 39, wind absorbs heat from this hot water sent from the hot water pump 38 by the heat radiating heat exchanger 35 to become a predetermined hot air temperature, and is sent to a predetermined place to realize the hot air heating. .

  On the other hand, the hot water that has been heat-exchanged by the heat radiating heat exchanger 35 and lowered to, for example, about 50 to 60 ° C. and has become medium-temperature water is returned to the latent heat storage unit 40 that is a heat storage unit via the warm water return pipe 34. In the latent heat storage section 40, the returned medium-temperature water flows through the water passage 42 and exchanges heat with sodium sulfate hydrate, a latent heat storage agent contained in the heat storage plate 41. The sodium sulfate hydrate absorbed heat from the medium temperature water and absorbed latent heat near the melting point. On the other hand, the temperature of this medium temperature water is further reduced by releasing heat to sodium sulfate hydrate, and is slightly higher than the temperature level close to the average water temperature of the year, for example, about 20 ° C. to 30 ° C.

  As shown in FIG. 3, in order to secure a constant heat storage amount, for example, 200 kJ / L, water needs to be up to 65 ° C., whereas sodium sulfate hydrate is about 32 ° C. Can be realized. Further, when compared at the same temperature level, although depending on the temperature zone, sodium sulfate hydrate has a heat storage amount about twice that of water. Thus, when the latent heat storage agent is used, a predetermined amount of heat can be stored at a low temperature level.

  Further, when there is a hot water request from the hot water supply terminal 32, the bypass flow rate electromagnetic valve 44 opens at a predetermined opening, and the hot water bypass pipe 43 is allowed to pass through the water supply pipe 28. In this way, by passing the water supply through the water passage 41 of the latent heat storage unit 40, the amount of heat of a part of the medium-temperature water stored in the latent heat storage agent of the latent heat storage unit 40 is preheated. Then, the water supply preheated by the latent heat storage agent is mixed with the hot water supplied from the hot water outlet pipe 29 or the water supplied from the water supply pipe 28 to obtain a desired hot water supply temperature and supplied to the hot water supply terminal 32.

  As described above, by providing the latent heat storage unit 40 including the heat storage plate 41 that exchanges heat with the intermediate warm water returned from the warm water return pipe 34, the temperature of the intermediate warm water returned from the warm water return pipe 34 is further reduced. Therefore, when the portion of the warm water that has returned from the warm water return pipe 34 is boiled again, the water / refrigerant heat exchanger water temperature of the heat pump cycle is low, and high efficiency operation of the heat pump cycle can be realized. . In particular, after the latent heat storage unit 40 has become a low temperature, even if there is no request for hot water supply immediately after heating operation for a long time, it is possible to lower the temperature of the intermediate temperature water by the action of latent heat absorption, and high efficiency. The heat pump hot water supply apparatus can be provided.

  In addition, the amount of heat stored in the latent heat storage unit 40 can be used without waste by effectively using the outlet water bypass pipe 43 so as to preheat the water supply, so both high efficiency and compactness can be achieved without running out of hot water. It is possible to provide a high performance heat pump water heater.

  In addition, by setting the melting point of the latent heat storage agent to around the annual average water temperature, it becomes easy to take a temperature difference when the intermediate warm water returned from the warm water return pipe 34 exchanges heat with the heat storage plate 41. In addition, by improving the heat exchange performance, it is possible to realize a compact and lightweight heat storage unit, and it is possible to lower the temperature of the medium-temperature water to around the annual average water temperature. Furthermore, when the water is re-boiled, the water / refrigerant heat exchanger water temperature of the heat pump cycle can be secured low, so that highly efficient operation of the heat pump cycle can be realized with certainty.

  In addition, by using carbon dioxide as the refrigerant in the heat pump cycle, it is possible to conserve the global environment, and by setting the pressure above the critical pressure, the carbon dioxide in the refrigerant will condense even if the temperature drops due to water being deprived of heat. In addition, it becomes easier to form a temperature difference between the refrigerant and water throughout the water / refrigerant heat exchanger, and the water can be efficiently heated to the required high temperature level, so it can be used for heat dissipation terminals that require high temperature levels. At the same time, by lowering the incoming water temperature of the water / refrigerant heat exchanger, a highly efficient operation of the heat pump cycle can be realized, and a highly efficient heat pump water heater can be provided.

( Reference Example 2 )
FIG. 4 is a system configuration diagram showing a heat pump water heater in Reference Example 2 of the present invention.

This reference example 2 is different from the reference example 1 in that a latent heat storage unit 45 is provided in the pipeline of the hot water return pipe 34 separately from the hot water storage tank 27. The latent heat storage unit 45 has the same configuration as that of the latent heat storage unit 40 of the first embodiment, and includes a water supply source via a water supply pipe 28, a hot water storage tank 27 via a return pipe 46, and a mixing pipe, respectively. 47 is in communication with the mixing valve 31.

In addition, the thing of the same code | symbol as the reference example 1 has the same structure, and abbreviate | omits description.

  Next, the operation and action will be described. The hot water that has been heat-exchanged by the heat-dissipating heat exchanger 35 and lowered to a temperature of, for example, about 50 to 60 ° C. Returned to section 45. In the latent heat storage unit 45, the returned medium-temperature water flows through the water passage 42 and exchanges heat with sodium sulfate hydrate, a latent heat storage agent contained in the heat storage plate 41. The sodium sulfate hydrate absorbed heat from the medium-temperature water and absorbed latent heat particularly near the melting point. On the other hand, the temperature of this medium temperature water is further reduced by releasing heat to sodium sulfate hydrate, and is slightly higher than the temperature level close to the average water temperature annually, for example, about 20 ° C. to 30 ° C. Returned to tank 27. When the water in the hot water storage tank 27 is boiled again, the incoming temperature of the water / refrigerant heat exchanger of the heat pump cycle is low, and high efficiency operation of the heat pump cycle can be realized. In particular, after the latent heat storage unit 45 has become a low temperature, even if there is no request for hot water supply immediately after heating operation for a long time, it is possible to lower the temperature of the intermediate warm water by the action of latent heat absorption, and high efficiency. The heat pump hot water supply apparatus can be provided.

  In addition, when there is a hot water discharge request from the hot water supply terminal 32, a portion of the medium-temperature water stored in the latent heat storage agent of the latent heat storage unit 45 is supplied from the water supply pipe 28 through the water passage 41 of the latent heat storage unit 45. The amount of heat will be preheated. Then, the feed water preheated by the latent heat storage agent is mixed with the high-temperature hot water coming from the tapping pipe 29 through the mixing pipe 47, reaches a desired hot water supply temperature, and is supplied to the hot water supply terminal 32.

  In this way, by separately installing the latent heat storage unit 45 from the hot water storage tank 27, the capacity, size, installation mode, etc. of the latent heat storage unit 45 can be set in accordance with the ability and frequency of use of the heat radiating terminal. Therefore, it is possible to provide a high-efficiency heat pump hot water supply apparatus that can design the temperature level to an optimum value and does not run out of hot water with a high degree of design freedom.

Moreover, by installing separately, the installation property of a heat pump hot-water supply apparatus, maintainability, etc. can be improved, and a more reliable high-performance heat pump hot-water supply apparatus can be provided.
Moreover, it is not necessary to provide the outlet of the bypass hot water discharge pipe 43 in the hot water storage tank 27, and the manufacturing cost of the hot water storage tank 27 can be reduced.

( Embodiment 1 )
FIG. 5 is a configuration diagram of a main part of the heat pump water heater in the first embodiment of the present invention.

In this embodiment, the difference from the reference example 2 is that a latent heat storage unit 48 is newly provided. The latent heat storage unit 48 is configured by alternately laminating a preceding hot water flow path 50 communicating with the mixing pipe 47, a heat storage plate 49 containing a latent heat storage agent, and a return flow path 51 communicating with the hot water return pipe 34. Has been.

In addition, the thing of the same code | symbol as the reference example 2 has the same structure, and abbreviate | omits description.

  Next, the operation and action will be described. The hot water that has been heat-exchanged by the heat-dissipating heat exchanger 35 and lowered to a temperature of, for example, about 50 to 60 ° C. Returned to section 48. In the heat storage section 48, the returned medium-temperature water flows through the return flow path 51 and exchanges heat with sodium sulfate hydrate, a latent heat storage agent contained in the heat storage plate 49. The sodium sulfate hydrate absorbed heat from the medium-temperature water, and absorbed latent heat particularly near the melting point. On the other hand, the temperature of this medium temperature water is further reduced by releasing heat to sodium sulfate hydrate, and is slightly higher than the temperature level close to the average water temperature annually, for example, about 20 ° C. to 30 ° C. Returned to tank 27. When the water in the hot water storage tank 27 is boiled again, the incoming temperature of the water / refrigerant heat exchanger of the heat pump cycle is low, and high efficiency operation of the heat pump cycle can be realized. In particular, when hot water is supplied from the hot water supply terminal 32, water or pre-warm water always flows from the water supply pipe 28 to the mixing valve 31 through the preceding hot water flow path 50 of the latent heat storage section 48, so that the latent heat storage section 48 is always kept at a low temperature level. Therefore, it is possible to prepare for latent heat absorption from the medium-temperature water that comes from the heating operation. Even if there is no request for hot water supply from the user immediately after heating operation for a long time, the temperature of the intermediate hot water can be lowered by the action of latent heat absorption, and a highly efficient heat pump hot water supply apparatus can be provided.

  In addition, in this way, by providing the preceding hot water flow channel 50 communicating with the mixing pipe 47 and the return flow channel 51 communicating with the hot water return pipe 34 inside the latent heat storage section 48, the intermediate hot water is returned to the hot water. Since the circuit that flows from the pipe 34 through the return flow path 51 and returns to the hot water storage tank and the circuit from which the water supply from the water supply pipe 28 flows through the preceding hot water flow path 50 and flows to the mixing pipe 47 are completely separate circuits, the flow rate of each circuit Etc. can be controlled individually, so that the control accuracy according to the use situation can be improved. In particular, when the heating operation and the water supply exercise are performed simultaneously, the medium-temperature water and the water supply are separate circuits, so that they do not mix and interfere with each other within the latent heat storage unit 48, and each heating operation and hot water supply at an appropriate temperature and flow rate. Since it can respond | correspond to a driving | operation, a heat pump hot-water supply apparatus with more user-friendliness can be provided.

( Reference Example 3 )
FIG. 6 is a system configuration diagram of the heat pump water heater in Reference Example 3 of the present invention.

This reference example 3 is different from the reference example 1 in that an intermediate heat exchanger 52 is provided between the hot water going pipe 33 and the hot water return pipe 34 of the hot water circuit 36, and the intermediate heat exchanger 52 corresponds to the intermediate heat exchanger 52. For example, a heating medium circuit 55 including a heating pump 53 that drives and circulates water and a warm air fan 54 that is a heat radiating terminal is newly provided.

In addition, the thing of the same code | symbol as the reference example 1 has the same structure, and abbreviate | omits description.

  Next, the operation and action will be described. In the intermediate heat exchanger 52, heat exchange is performed between the hot water sent by the hot water pump 38 and the heat medium sent by the heating pump 53. The heat medium absorbs heat from the hot water, reaches a predetermined temperature, and flows to the hot air machine 54. Then, the heat medium exchanges heat with the wind in the warm air machine 54 to lower the temperature and return to the intermediate heat exchanger 52. On the other hand, in the warm air machine 54, the wind receives heat from the heat medium, becomes warm air at a predetermined temperature, and is sent to a predetermined location to realize warm air heating.

  In each of the above embodiments, the heat storage means is a latent heat storage unit configured by a heat storage plate. For example, as a latent heat storage unit configured by a spherical capsule packed with a latent heat storage material instead of the heat storage plate. Also good.

  As described above, the heat of the hot water in the hot water storage tank 27 is indirectly heated by performing the heat exchange between the hot water in the hot water storage tank 27 and the heat medium in the heat medium circuit 55 through the intermediate heat exchanger 52. 39, it is not necessary to bring hot water to a location close to the user of the hot air blower 39 terminal, so that a highly safe heat pump hot water supply apparatus can be provided.

  As described above, the heat pump hot water supply apparatus according to the present invention can provide a high-performance heat pump hot water supply apparatus without running out of hot water or reducing heat pump cycle efficiency. In addition, it can be widely applied to applications such as heat exchange and heat transfer.

System configuration diagram of heat pump water heater in Reference Example 1 The principal part enlarged view of the heat pump hot-water supply apparatus in this reference example 1 Heat storage density comparison chart showing heat storage amount per unit volume in Reference Example 1 Heat pump hot water supply system configuration diagram in Reference Example 2 Heat pump hot water supply system configuration diagram in Embodiment 1 of the present invention The principal part enlarged view of the heat pump hot-water supply apparatus in the reference example 3 of this invention Configuration diagram of conventional heat pump water heater

DESCRIPTION OF SYMBOLS 20 Refrigerant circuit 21 Compressor 22 Radiator 23 Pressure reduction means 24 Heat absorber 27 Hot water storage tank 30 Water / refrigerant heat exchanger 33 Hot water going pipe 34 Hot water return pipe 35 Radiation heat exchanger 36 Hot water circuit 38 Hot water pump 39, 54 Hot air machine 40, 45, 48 Latent heat storage section 43 Hot water bypass pipe

Claims (3)

A refrigerant circulation circuit comprising a hot water storage tank, a compressor and a radiator, a water / refrigerant heat exchanger in heat exchange relationship with the radiator, and water / refrigerant heat exchange of water taken from the bottom of the hot water storage tank A stacking pump that heats and returns to the upper part of the hot water storage tank through a heater; a hot water pump that returns hot water taken out from the upper part of the hot water storage tank to the lower part of the hot water storage tank through a heat dissipation heat exchanger ; A water supply pipe for supplying water from the lower part , a first flow channel for exchanging heat flowing out from the heat-dissipating heat exchanger and flowing to the lower part of the hot water storage tank, and water supplied from the water supply pipe for heat exchange A heat storage means comprising at least a second flowing water channel, and a hot water discharge pipe for discharging hot water stored in the hot water storage tank, provided at an upper portion of the hot water storage tank, and the second flowing water channel and the hot water discharging pipe are provided. Hot water bypass pipe to be connected The heat storage means includes a heat storage plate containing a latent heat storage agent and a flow channel formed by laminating the heat storage plates, and each of the first flow channel and the second flow channel is provided in plurality. A heat pump hot water supply apparatus characterized by having these layers alternately laminated . The heat pump hot water supply apparatus according to claim 1 , wherein the heat storage means is provided separately from the hot water storage tank. The heat pump water heater according to claim 1 or 2, wherein the refrigerant is carbon dioxide and the pressure is equal to or higher than a critical pressure.

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