EP1972862A1 - Dispositif d alimentation en eau chaude d une pompe a chaleur - Google Patents

Dispositif d alimentation en eau chaude d une pompe a chaleur Download PDF

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Publication number
EP1972862A1
EP1972862A1 EP06832949A EP06832949A EP1972862A1 EP 1972862 A1 EP1972862 A1 EP 1972862A1 EP 06832949 A EP06832949 A EP 06832949A EP 06832949 A EP06832949 A EP 06832949A EP 1972862 A1 EP1972862 A1 EP 1972862A1
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EP
European Patent Office
Prior art keywords
refrigerant
water
cycle
heat pump
hot water
Prior art date
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Granted
Application number
EP06832949A
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German (de)
English (en)
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EP1972862B1 (fr
EP1972862A4 (fr
Inventor
Atsushi Kakiuchi
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Sharp Corp
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Sharp Corp
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Publication date
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Publication of EP1972862A4 publication Critical patent/EP1972862A4/fr
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Publication of EP1972862B1 publication Critical patent/EP1972862B1/fr
Expired - Fee Related legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D17/00—Domestic hot-water supply systems
    • F24D17/02—Domestic hot-water supply systems using heat pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
    • F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2309/00—Gas cycle refrigeration machines
    • F25B2309/06—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide
    • F25B2309/061—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide with cycle highest pressure above the supercritical pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/003—Indoor unit with water as a heat sink or heat source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/021—Indoor unit or outdoor unit with auxiliary heat exchanger not forming part of the indoor or outdoor unit
    • F25B2313/0213—Indoor unit or outdoor unit with auxiliary heat exchanger not forming part of the indoor or outdoor unit the auxiliary heat exchanger being only used during heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/06—Several compression cycles arranged in parallel

Definitions

  • the present invention relates to a heat pump water heater for supplying hot water by heating water by means of heat exchange with a refrigerant circulating within a heat pump cycle provided with a compressor and an expander, and more particularly, to a heat pump water heater comprising two heat pump cycles, each employing a refrigerant having different properties, such as the heat exchange efficiency and the energy consumption efficiency.
  • the refrigerant may be, such as carbon dioxide gas refrigerant and HFC refrigerant.
  • the carbon dioxide gas refrigerant is able to heat water to high temperatures (for example, around 90 degrees centigrade) as its refrigerant property.
  • the HFC refrigerant can heat water only to relatively low temperatures (for example, around 65 degrees centigrade) due to its refrigerant property.
  • the energy consumption efficiency (COP) of the HFC refrigerant is better than that of the carbon dioxide gas refrigerant.
  • Patent Literature 1 Japanese Unexamined Patent Application Publication No. 2005-83585 discloses a heat pump type hot-water supply system comprising two heat pump cycles: one using CO 2 refrigerant (one example of carbon dioxide gas refrigerants) (hereinafter, referred to as "CO 2 cycle”), and the other using R410A refrigerant (one example of HFC refrigerants) (hereinafter, referred to as "R410A cycle").
  • CO 2 cycle one example of carbon dioxide gas refrigerants
  • R410A cycle one example of HFC refrigerants
  • Patent Literature 1 Japanese Unexamined Patent Application Publication No. 2005-83585 proposes to connect a close circuit for hot water-heating with the R410A cycle, so as to share the R410A cycle between supplying hot water and hot water heating.
  • Patent Literature 1 Japanese Unexamined Patent Application Publication No. 2005-83585
  • the R410A cycle may therefore be used for supplying hot water and hot water-heating, but not for cooling.
  • Patent Literature 1 Japanese Unexamined Patent Application Publication No. 2005-83585
  • the R410A cycle is selectively used either for supplying hot water or hot water-heating, but not simultaneously.
  • the heat pump type hot-water supply system is configured so as to selectively use either the CO 2 cycle or the R410A cycle.
  • the water heating efficiency in the heat pump type hot-water supply system is therefore limited to those of each the CO 2 cycle and the R410A cycle.
  • the temperature as well as the amount of the hot water supply becomes insufficient due to decrease in the water heating efficiency.
  • the R410A cycle may obviously be configured so as to obtain a sufficient temperature of the hot water supply, however, for the purpose of obtaining a sufficient temperature and an amount of hot water supply in the R410 cycle, increase in apparatus size and cost are required.
  • the first object of the present invention to provide a heat pump water heater capable of using a heat pump cycle for supplying hot water in both cooling and heating (air-conditioning).
  • the second object of the present invention is to obtain a sufficient temperature and an amount of the hot water supply when the heat pump water heater simultaneously conducts heating and supplying hot water.
  • a heat pump water heater comprises; a first heat pump cycle in which a first refrigerant circulates through at least a compressor and an expander, a second heat pump cycle in which a second refrigerant having properties different from those of the first refrigerant circulates through at least a compressor and an expander, and a water heat exchanger for conducting heat exchange between water and the first refrigerant and/or the second refrigerant, wherein the second heat pump cycle includes a first circulation path passing through the water heat exchanger, a second circulation path passing through an indoor air heat exchanger that conducts heat exchange between the second refrigerant and indoor air, and a circulating direction switching means for switching the circulating direction of the second refrigerant in the second heat pump cycle.
  • the first refrigerant may be carbon dioxide gas refrigerant
  • the second refrigerant may be HFC refrigerant.
  • the water heat exchanger is configured so as to enable heat exchange simultaneously between: water and the first refrigerant, and water and the second refrigerant, so that a sufficient temperature as well as an amount of the hot water supply can be obtained by distributing the second refrigerant for circulation in both the first and second circulation paths.
  • the present invention enables cooling and heating (air-couditioning) with the use of the second heat pump cycle. Also, when simultaneously performing heating and supplying hot water, a sufficient temperature and an amount of the hot water supply can be obtained.
  • Fig. 1 is a schematic configuration diagram of a heat pump water heater X1 according to an embodiment of the present invention.
  • the heat pump water heater X is generally configured by comprising: heat pump cycles 1 (one example of the first heat pump cycle) and 2 (one example of the second heat pump cycle) in which a refrigerant circulates, water flowing paths 30a to 30d, a storage tank 31, a water heat exchanger 32, a circulation pump 34 and switching valves 41 to 45. Additionally, the heat pump water heater X comprises a controller having such as CPU, RAM, and ROM (not shown).
  • the water heat exchanger 32 performs heat exchange between the refrigerant that flows in a piping 14 connected with the heat pump cycle 1 and in a piping 25 connected with the heat pump cycle 2, and water that flows on a water flowing path 30b running from a water supply port to a hot water supply port or on a water flowing path 30a returning to the storage tank 31.
  • the water flowing path 30a is a water flow channel that sequentially connects from the water supply port, the storage tank 31, the circulation pump 34, the switching valve 45, the water heat exchanger 32, the switching valve 43, and back to the storage tank 31.
  • the water flowing path 30b is a water flow channel that sequentially connects from the water supply port, the switching valve 45, the water heat exchanger 32, the switching valve 43, and to the hot water supply port.
  • the water flowing path 30c is a hot water flow channel connecting from the storage tank 31 to the hot water supply port via the switching valve 44
  • the water flowing path 30d is also a water flow channel connecting from the water supply port to the hot water supply port via the switching valve 44.
  • the present heat pump water heater X performs such as an instantaneous hot water supply operation for directly supplying hot water from the hot water supply port by heating water supplied from the water supply port using the water heat exchanger 32 on the water flowing path 30b, and a hot water storage operation for heating water supplied from the water supply port using the water heat exchanger 32 on the water flowing path 30a to store the heated water in the storage tank 31.
  • the instantaneous hot water supply operation distributes the water supplied from the water supply port in the direction of the dashed arrows along the water flowing path 30b, with the switching valves 43 and 45 controlled by the controller.
  • a sufficient heating amount cannot be achieved by the water heat exchanger 32.
  • the hot water stored in the storage tank 31 is mixed with the water, that is supplied from the water supply port via the water flowing path 30d, at the switching valve 44 via the water flowing path 30c, and then adjusted in its temperature before being supplied to the hot water supply port. This enables hot water to be supplied instantaneously from the hot water supply port.
  • the hot water at high temperature stored in the storage tank 31 may be supplied as it is, without being mixed with water supplied from the water supply port.
  • the hot water storage operation stores hot water in the storage tank 31, with the circulation pump 34 driven so as to distribute water in the direction of the solid arrows along the water flowing path 30a.
  • the heat pump cycle 1 (hereinafter referred to as "CO 2 cycle") has a circulation path 10 sequentially connecting a compressor 11, the water heat exchanger 32, an expander 12, and an outdoor air heat exchanger 13.
  • the controller drives the compressor 11 to circulate the CO 2 refrigerant (one example of the first refrigerant) as one example of carbon dioxide gas refrigerant in the direction of the arrows illustrated in the figure.
  • the CO 2 refrigerant has properties different from those of the after-mentioned R410A refrigerant, and is capable of heating water to high temperatures (around 90 degrees C) as its refrigerant property, however, has relatively low energy consumption efficiency.
  • the CO 2 cycle 1 is therefore used mainly for heating water in the hot water storage operation.
  • the CO 2 refrigerant at high temperature and high pressure compressed by the compressor 11 and discharged therefrom is cooled in the water heat exchanger 32 by heat exchange with water flowing on the water flowing paths 30a or 30b, then expands in the expander 12.
  • the CO 2 refrigerant at low temperature and low pressure expanded by the expander 12 absorbs heat from the outdoor air in the outdoor air heat exchanger 13 to vaporization by means of heat exchange, and then flows into the compressor 11 again.
  • the circulation of the CO 2 refrigerant in the circulation path 10 as mentioned above allows water flowing on the water flowing paths 30a or 30b in the arrow direction to be heated up around 90 degrees C by heat exchange with the CO 2 refrigerant in the water heat exchanger 32. And also, since the flow direction of the CO 2 refrigerant in the water heat exchanger 32 is opposite to the water flow direction, the heat exchange between the CO 2 refrigerant and water can be conducted efficiently.
  • the controller controls the switching valve 45 so that water passes through the water flowing path 30b, and also, controls the switching valve 43 so that the hot water heated in the water heat exchanger 32 is supplied to the hot water supply port.
  • the controller controls the switching valve 45 so that water passes through the water flowing path 30a, and also, controls the switching valve 43 to be switched so that the hot water heated in the water heat exchanger 32 is stored in the storage tank 31.
  • the heat pump cycle 2 (hereinafter referred to as "R410A cycle") has n circulation path 20 (one example of the first circulation path) and a circulation path 40 (one example of the second circulation path) in which the R410A refrigerant (one example of the second refrigerant) as one example of HFC refrigerant circulates.
  • the R410A refrigerant has properties different from those of the CO 2 refrigerant, and heats water to only low temperatures (around 65 degrees C) as compared with the CO 2 refrigerant.
  • COP Coefficient Of Performance
  • the R410A cycle 2 is used mainly for heating water in the instantaneous hot water supply operation.
  • R410A refrigerants there are, for example, R407C/E, R404A, R507A, and R134a refrigerants.
  • the two different refrigerants used for the heat pump water heater X are not limited to carbon dioxide gas refrigerant and HFC refrigerant, and other two refrigerants having properties, such as heat exchange efficiency and energy consumption efficiency, different from each other may be employed.
  • the circulation path 20 is configured by sequentially connecting from a compressor 21, a four-way valve 24, the switching valve 41, the water heat exchanger 32, the switching valve 42, an expander 22 (for example, an expanding valve), an outdoor air heat exchanger 23, and back to the four-way valve 24.
  • the controller (not shown) drives the compressor 21 to circulate the R410A refrigerant in the direction of the solid arrows illustrated in the figure. More specifically, the R410A refrigerant at high temperature and high pressure compressed by the compressor 21 and discharged therefrom reaches the water heat exchanger 32 via the four-way valve 24 and the switching valve 41. And the R410A refrigerant is then cooled in the water heat exchanger 32 by heat exchange with water flowing on the water flowing paths 30a or 30b. The R410A refrigerant is then expanded in the expander 22 through the switching valve 42.
  • the R410A refrigerant at low temperature and low pressure expanded by the expander 22 absorbs heat from the outdoor air in the outdoor air heat exchanger 23 to vaporization by means of heat exchange, and then flows again into the compressor 21 via the four-way valve 24.
  • the circulation of the R410A refrigerant in the circulation path 20 in the direction of the solid arrows as mentioned above allows water flowing on the water flowing path 30a or 30b in the direction of arrows to be heated to around 65 degrees C by heat exchange with the R410A refrigerant in the water heat exchanger 32. And also, since the flow direction of the R410A refrigerant in the water heat exchanger 32 are opposite to that of water therein, the heat exchange between the R410A refrigerant and water can be conducted efficiently.
  • the water heat exchanger 32 is shared by both the CO 2 cycle 1 and the R410A cycle 2, and capable of performing heat exchange simultaneously between the CO 2 and R410A refrigerants circulating thereof and the water flowing on the water flowing paths 30a or 30b. More specifically, in the water heat exchanger 32, a piping 14 of the CO 2 refrigerant and a piping 25 of the R410A refrigerant both provided inside of the water heat exchanger 32 are positioned so as to commonly make contacts with a piping 33 provided on the water flowing paths 30a and 30b.
  • the heat pump water heater X uses the CO 2 cycle 1 and the R410A cycle 2 simultaneously, so as to heat water at heat exchange efficiency higher than those of each cycle. This enables the amount of the hot water supply to increase in the instantaneous hot water supply operation.
  • the circulation path 40 is configured by sequentially connecting from the compressor 21, the four-way valve 24, the switching valve 41, an indoor air heat exchanger 4, the switching valve 42, the expander 22, the outdoor air heat exchanger 23, and back to the four-way valve 24.
  • the indoor air heat exchanger 4 is provided in an air conditioner (not shown) for cooling and heating the indoor, and heats or cools the indoor air by performing heat exchange between the R410A refrigerant circulating within the circulation path 40 and the indoor air.
  • the R410A cycle 2 when the circulating direction of the R410A refrigerant in the R410A cycle 2 is constant, the R410A cycle 2 cannot be used for cooling and heating (air-conditioning) performed by the air conditioner (not shown). More specifically, when the circulating direction of the R410A refrigerant is only the same direction as the circulation path 20 (the direction shown with the solid arrows in Fig. 1 ), only heating can be performed, not cooling.
  • the heat pump water heater in accordance with one embodiment of the present invention allows the four-way valve 24 to be controlled by the controller (not shown), so that the circulating direction of the R410A refrigerant in the circulation path 40 is switched between the solid arrow direction and the dashed arrow direction shown in the figure.
  • the controller and the four-way valve 24 at the time of switching the circulating direction of the R410A refrigerant corresponds to a circulating direction switching means.
  • the controller controls the compressor 21 and the four-way valve 24 in the heat pump water heater X, so that the circulation of the R410A refrigerant starts in the direction shown with the solid arrows in the circulation path 40 in the R410A cycle 2.
  • the solid path shown in the figure is established inside of the four-way valve 24.
  • the R410A refrigerant in the circulation path 40 to circulate in the direction of the solid arrows shown in the figure. More specifically, the R410A refrigerant at high temperature and high pressure compressed by the compressor 21 and discharged therefrom reaches the indoor air heat exchanger 4 via the four-way valve 24 and the switching valve 41. The R410A refrigerant is then cooled in the indoor air heat exchanger 4 by heat exchange with the indoor air. After that, the R410A refrigerant is expanded in the expander 22 via the switching valve 42. And then, the R410A refrigerant at low temperature and low pressure expanded by the expander 22 absorbs heat from the outdoor air in the outdoor air heat exchanger 23 to vaporization by means of heat exchange, and flows again into the compressor 21 via the four-way valve 24.
  • the circulation of the R410A refrigerant in the circulation path 40 in the direction of the solid arrows as mentioned above allows the indoor air to be heated by heat exchange with the R410A refrigerant in the indoor air heat exchanger 4. In short, heating is achieved by the heat pump water heater X.
  • the conventional devices cannot perform instantaneous hot water supply and heating simultaneously by using the R410A cycle 2.
  • the R410A refrigerant may be distributed so as to perform instantaneous hot water supply and heating simultaneously, however, in such case, there still remains a problem that a sufficient temperature and an amount of hot water supply cannot be obtained.
  • the heat pump water heater X allows the CO 2 refrigerant circulating in the CO 2 cycle 1 and the R410A refrigerant circulating in the R410A cycle 2 to heat water simultaneously in the water heat exchanger 32. This enables a sufficient temperature and an amount of the hot water supply to be obtained, when simultaneously performing the instantaneous hot water supply and the heating. In the following, this regard is explained in details.
  • the controller controls the switching valves 41 and 42 in the heat pump water heater X, so that the circulation of the R410A refrigerant starts in the direction shown with the solid arrows in the circulation path 20 in the R410A cycle 2.
  • the R410A refrigerant is distributed for circulation to both the circulation paths 20 and 40 in the R410A cycle 2.
  • the R410A refrigerant circulating in the circulation path 20 in the water heat exchanger 32 may therefore be unable to heat water sufficiently.
  • the controller controls the drive of the compressor 11 in the CO 2 cycle 1, so that The circulation of the CO 2 refrigerant starts in the CO 2 cycle 1.
  • the controller controls the compressor 21 and the four-way valve 24 in the heat pump water heater X, so that the circulation of the R410A refrigerant starts in the direction shown with the dashed arrows in the circulation path 40 in the R410A cycle 2.
  • the dashed line path shown in the figure is established inside of the four-way valve 24.
  • the R410A refrigerant in the circulation path 40 to circulate in the direction of the dashed arrows shown in the figure. More specifically, the R410A refrigerant at high temperature and high pressure compressed by the compressor 21 and discharged therefrom reaches the outdoor air heat exchanger 23 via the four-way valve 24. And then, the R410A refrigerant is cooled in the outdoor air heat exchanger 23 by mean of heat exchange with the outdoor air. The R410A refrigerant is then expanded in the expander 22.
  • the R410A refrigerant at low temperature and low pressure expanded by the expander 22 passes through the switching valve 42 and then absorbs heat from the indoor air in the indoor air heat exchanger 4 to vaporization by means of heat exchange, and then flows again into the compressor 21 via the switching valve 41 and the four-way valve 24.
  • the circulation of the R410A refrigerant in the circulation path 40 in the direction of the dashed arrows as mentioned above allows indoor air to be cooled by heat exchange with the R410A refrigerant in the indoor air heat exchanger 4.
  • the heat pump water heater X achieves the cooling operation.
  • the heat pump water heater X enables the switching valves 41 and 42 to be controlled by the controller (not shown), so that the circulation of the R410A refrigerant in the circulation path 20 is blocked. And thus, there is no obstacle for the CO 2 cycle 1 to perform the hot water storage operation, even when the R410A cycle 2 is performing the cooling operation.
  • the four-way valve 24 switches the circulating direction of the R410A refrigerant in both the circulation paths 20 and 40.
  • the heat pump water heater cannot, therefore, perform the cooling and the instantaneous hot water supply simultaneously.
  • the cooling and the instantaneous hot water supply operations can be performed simultaneously.
  • Fig. 2 is a schematic configuration diagram showing a heat pump water heater X1 according to another embodiment of the present invention.
  • the components same as those in the heat pump water heater X described in the above embodiment are allocated with the same symbols, thereby omitting the description thereof.
  • the heat pump water heater X1 has a R410A cycle 5 instead of R410A cycle 2 in the heat pump water heater X.
  • R410A cycle 5 Provided in the R410A cycle 5 arc switching valves 51 to 56 and two expanders 22a and 22b that are controlled by the controller (not shown).
  • the circulating direction of the R410A refrigerant in the circulation path 20 as well as that in the circulation path 40 can be controlled independently.
  • the R410A cycle 5 can therefore perform the cooing or heating and the instantaneous hot water supply simultaneously.
  • the compressor 21, the four-way valve 24, and the switching valves 51 to 56 are controlled by the controller (not shown) in the R410A cycle 5, so that the R410A refrigerant circulates in the direction of solid arrows in Fig 2 .
  • the R410A refrigerant circulates sequentially from the compressor 21, the four-way valve 24, the switching valve 51, the switching valve 52, the water heat exchanger 32, the expander 22a, the switching valve 53, the switching valve 54, the outdoor air heat exchanger 23, the switching valve 56, the four-way valve 24, and back to the compressor 21.
  • This allows the water heat exchanger 32 to heat water that flows on the water flowing paths 30a or 30b.
  • the R410A refrigerant circulates sequentially from the compressor 21, the four-way valve 24, the switching valve 51, the indoor air heat exchanger 4, the switching valve 55, the expander 22b, the switching valve 54, the outdoor air heat exchanger 23, the switching valve 56, the four-way valve 24, and back to the compressor 21.
  • This allows the indoor air heat exchanger 4 to heat indoor air for the heating operation.
  • the R410A refrigerant may be distributed by the switching valve 51, thereby performing instantaneous hot water supply and heating simultaneously. Additionally, the decrease in the water heating efficiency in the water heat exchanger 32 due to flow of the R410A refrigerant can be compensated by the CO 2 cycle 1.
  • the compressor 21, the four-way valve 24, and the switching valves 51 to 56 are controlled by the controller (not shown) in the R410A cycle 5, so that the R410A refrigerant circulates in the direction of dashed arrows in Fig 2 .
  • the R410A refrigerant circulates sequentially from the compressor 21, the four-way valve 24, the switching valve 56, the switching valve 52, the water heat exchanger 32, the expander 22a, the switching valve 53, the switching valve 55, the indoor air heat exchanger 4, the switching valve 51, the four-way valve 24, and back to the compressor 21.
  • This allows the water heat exchanger 32 to heat water that flows on the water flowing paths 30a or 30b.
  • the R410A refrigerant circulates sequentially from the compressor 21, the four-way valve 24, the switching valve 56, the outdoor air heat exchanger 23, the switching valve 54, the expander 22b, the switching valve 55, the indoor air heat exchanger 4, the switching valve 51, the four-way valve 24, and back to the compressor 21. This allows the indoor air heat exchanger 4 to cool indoor air for the cooling operation.
  • the R410A refrigerant may be distributed by the switching valve 56, thereby performing cooling and instantaneous hot water supply simultaneously. Additionally, the decrease in the water heating efficiency in the water heat exchanger 32 due to flow of the R410A refrigerant can be compensated by the CO 2 cycle 1.
  • present embodiment as well as the above-mentioned embodiment include switching valves, however, the similar effect may be obtained by diminishing the function, without switching valves.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Details Of Fluid Heaters (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
  • Other Air-Conditioning Systems (AREA)
EP06832949.9A 2005-12-28 2006-11-20 Dispositif d alimentation en eau chaude d une pompe a chaleur Expired - Fee Related EP1972862B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005378539A JP3966889B2 (ja) 2005-12-28 2005-12-28 ヒートポンプ式給湯機
PCT/JP2006/323099 WO2007077687A1 (fr) 2005-12-28 2006-11-20 Dispositif d’alimentation en eau chaude d’une pompe a chaleur

Publications (3)

Publication Number Publication Date
EP1972862A1 true EP1972862A1 (fr) 2008-09-24
EP1972862A4 EP1972862A4 (fr) 2013-09-11
EP1972862B1 EP1972862B1 (fr) 2015-10-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP06832949.9A Expired - Fee Related EP1972862B1 (fr) 2005-12-28 2006-11-20 Dispositif d alimentation en eau chaude d une pompe a chaleur

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EP (1) EP1972862B1 (fr)
JP (1) JP3966889B2 (fr)
CN (1) CN101346592B (fr)
WO (1) WO2007077687A1 (fr)

Cited By (1)

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CN101346592B (zh) 2011-08-03
WO2007077687A1 (fr) 2007-07-12
JP2007178088A (ja) 2007-07-12
EP1972862A4 (fr) 2013-09-11
CN101346592A (zh) 2009-01-14
JP3966889B2 (ja) 2007-08-29

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