EP3693670A1 - Heat pump system - Google Patents
Heat pump system Download PDFInfo
- Publication number
- EP3693670A1 EP3693670A1 EP20155785.7A EP20155785A EP3693670A1 EP 3693670 A1 EP3693670 A1 EP 3693670A1 EP 20155785 A EP20155785 A EP 20155785A EP 3693670 A1 EP3693670 A1 EP 3693670A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hot water
- refrigerant
- connecting portion
- heat
- heat medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 197
- 239000003507 refrigerant Substances 0.000 claims abstract description 179
- 238000010438 heat treatment Methods 0.000 description 44
- 238000007599 discharging Methods 0.000 description 11
- 238000010257 thawing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000005855 radiation Effects 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
Classifications
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- 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
- F24D15/00—Other domestic- or space-heating systems
- F24D15/04—Other domestic- or space-heating systems using heat pumps
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- 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
- F24D19/00—Details
- F24D19/0097—Casings or frame structures for hydraulic components
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
- F24H4/04—Storage heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/02—Casings; Cover lids; Ornamental panels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/12—Arrangements for connecting heaters to circulation pipes
- F24H9/13—Arrangements for connecting heaters to circulation pipes for water heaters
-
- 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
- F24D2200/00—Heat sources or energy sources
- F24D2200/12—Heat pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/26—Refrigerant piping
- F24F1/32—Refrigerant piping for connecting the separate outdoor units to indoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/001—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems in which the air treatment in the central station takes place by means of a heat-pump or by means of a reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0096—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater combined with domestic apparatus
Definitions
- the present invention relates to a heat pump system for producing hot water using a heat pump cycle.
- a heat pump unit is placed on a ceiling surface of a hot water tank unit having a hot water tank.
- the ceiling surface of the hot water tank unit is provided with two pipe-connecting portions projecting from an outer surface thereof.
- a casing of the heat pump unit is also provided with two pipe-connecting portions projecting from an outer surface thereof.
- the hot water tank unit and the heat pump unit have such a configuration that water circulates through a hot water unit and the heat pump unit by connecting these two pipe-connecting portions to each other through two pipes.
- Patent Document 1 Japanese Patent Application Laid-open No. 2011-122752
- the present invention solves the conventional problem and it is an object of the invention to provide a heat pump system which enhances outward appearance by placing a connecting portion which connects a pipe to a product or at least a portion of a pipe which is connected to the connecting portion in a place where a user cannot usually keep an eye on.
- the present invention provides a heat pump system including: a heat pump unit where a compressor, a decompressor and an evaporator are placed; a hot water unit where at least a water-refrigerant heat exchanger is placed; a first refrigerant pipe through which refrigerant compressed by the compressor flows toward the water-refrigerant heat exchanger; and a second refrigerant pipe through which the refrigerant after it releases heat in the water-refrigerant heat exchanger flows toward the decompressor, in which the first refrigerant pipe and the second refrigerant pipe connect the heat pump unit and the hot water unit to each other, wherein a casing which forms the hot water unit includes a recess which is recessed in a deeper direction than standing surfaces and in a lower direction than a ceiling surface, and a first connecting portion which connects the hot water unit and the first refrigerant pipe to each other and a second connecting portion which connects the hot water unit and the second refrigerant pipe
- the casing which forms the hot water unit includes the recess which is recessed in the deeper direction than the standing surface and in the lower direction than the ceiling surface, and the first connecting portion which connects the hot water unit and the first refrigerant pipe to each other and the second connecting portion which connects the hot water unit and the second refrigerant pipe to each other are placed in the recess. Therefore, since the first connecting portion and the second connecting portion are located in a place where a user cannot usually keep an eye on, it is possible to provide a heat pump system which enhances the outward appearance.
- a portion of the first refrigerant pipe which is connected to the first connecting portion and a portion of the second refrigerant pipe which is connected to the second connecting portion are also placed in the recess. Therefore, since these portions are located in a place where a user cannot usually keep an eye on, it is possible to provide a heat pump system which enhances the outward appearance.
- a connecting portion which connects a pipe to a produce and at least a portion of a pipe connected to the connecting portion are located in place where a user cannot usually keep an eye on. Therefore, it is possible to provide a heat pump system which enhances the outward appearance.
- a first aspect of the present invention provides a heat pump system including: a heat pump unit where a compressor, a decompressor and an evaporator are placed; a hot water unit where at least a water-refrigerant heat exchanger is placed; a first refrigerant pipe through which refrigerant compressed by the compressor flows toward the water-refrigerant heat exchanger; and a second refrigerant pipe through which the refrigerant after it releases heat in the water-refrigerant heat exchanger flows toward the decompressor, in which the first refrigerant pipe and the second refrigerant pipe connect the heat pump unit and the hot water unit to each other, wherein a casing which forms the hot water unit includes a recess which is recessed in a deeper direction than standing surfaces and in a lower direction than a ceiling surface, and a first connecting portion which connects the hot water unit and the first refrigerant pipe to each other and a second connecting portion which connects the hot water unit and the second refrigerant pipe to
- the casing which forms the hot water unit includes the recess which is recessed in the deeper direction than the standing surface and in the lower direction than the ceiling surface, and the first connecting portion which connects the hot water unit and the first refrigerant pipe to each other and the second connecting portion which connects the hot water unit and the second refrigerant pipe to each other are placed in the recess. Therefore, since the first connecting portion and the second connecting portion are located in a place where a user cannot usually keep an eye on, it is possible to provide a heat pump system which enhances the outward appearance.
- a portion of the first refrigerant pipe which is connected to the first connecting portion and a portion of the second refrigerant pipe which is connected to the second connecting portion are also placed in the recess. Therefore, since these portions are located in a place where a user cannot usually keep an eye on, it is possible to provide a heat pump system which enhances the outward appearance.
- longitudinal directions of the first connecting portion and the second connecting portion are placed substantially in a horizontal direction.
- the recess opens toward a rear surface of the casing.
- the first refrigerant pipe which is connected to the first connecting portion of the hot water unit and the second refrigerant pipe which is connected to the second connecting portion of the hot water unit can be placed behind a rear surface of the casing of the hot water unit through the opening.
- first connecting portion and the second connecting portion which are provided in the hot water unit, as well as the first refrigerant pipe and the second refrigerant pipe which are respectively connected to the first connecting portion and the second connecting portion are also located in the place where a user cannot usually keep an eye on. Therefore, it is possible to provide the heat pump system which further enhances the outward appearance.
- a hot water tank is placed in the hot water unit.
- the refrigerant is combustible refrigerant.
- the refrigerant is the combustible refrigerant having density larger than air under atmospheric pressure.
- the first connecting portion which connects the hot water unit and the first refrigerant pipe to each other and the second connecting portion which connects the hot water unit and the second refrigerant pipe to each other are provided on the side of the ceiling surface of the hot water unit.
- Fig. 1 is a circuit diagram of a heat pump system in an embodiment of the present invention.
- the heat pump system of the embodiment includes a heat pump unit 1 placed outdoors and a hot water unit 2 placed indoors.
- the hot water unit 2 is connected to a heating terminal 19 through a heat medium pipe 20.
- a water supply pipe 31 for supplying water from a water pipe or the like to the hot water unit 2, and a hot water-discharging pipe 30 for supplying hot water to the hot water supply terminal 33 are connected to the hot water unit 2.
- Fig. 2 is a diagram showing a connection configuration of the heat pump system of the embodiment.
- the heat pump unit 1 and the hot water unit 2 of the heat pump system are connected to each other through a first refrigerant pipe 8c and a second refrigerant pipe 8d.
- the heat pump unit 1 and the hot water unit 2 are connected to each other through an electric wiring 18.
- a control signal is transmitted from a control device 21 (see Fig. 1 ) provided in the hot water unit 2 to the heat pump unit 1 through the electric wiring 18.
- the hot water unit 2 and the heating terminal 19 are connected to each other through the heat medium pipe 20.
- the hot water-discharging pipe 30 is connected to the hot water unit 2. Hot water is supplied to the hot water supply terminal 33 through the hot water-discharging pipe 30.
- the water supply pipe 31 is connected to the hot water unit 2. Water is supplied to a hot water tank 15 through the water supply pipe 31.
- the heat pump unit 1 includes a compressor 3 which compresses refrigerant and discharges high temperature refrigerant, a decompressor 5 which decompresses refrigerant, an evaporator 6a which exchanges heat between air and refrigerant, and a four-way valve 7 which changes a flowing path of the refrigerant.
- the compressor 3, the decompressor 5, the evaporator 6a and the four-way valve 7 are connected to one another through refrigerant pipes.
- a solenoid expansion valve or a capillary tube is used as the decompressor 5.
- the heat pump unit 1 is provided with a blower fan 6b for sending a wind to the evaporator 6a and facilitating heat exchange between air and refrigerant.
- the heat pump unit 1 is provided with a casing 2a (see Fig. 3 ) for covering the compressor 3, the decompressor 5, the evaporator 6a, the blower fan 6b and the four-way valve 7.
- a water-refrigerant heat exchanger 4 which exchanges heat between heat medium and high temperature refrigerant to produce high temperature heat medium is placed in the hot water unit 2.
- the water-refrigerant heat exchanger 4 is annularly connected through the refrigerant pipe together with the compressor 3, the decompressor 5, the evaporator 6a and the four-way valve 7 and constitutes a heat pump cycle.
- a plate type heat exchanger can be used as the water-refrigerant heat exchanger 4.
- a double-pipe type heat exchanger having a heat medium pipe and a refrigerant pipe can also be used as the water-refrigerant heat exchanger 4.
- Heat medium flows through the heat medium pipe and refrigerant flows through the refrigerant pipe.
- the heat medium pipe is placed in the refrigerant pipe. Water or antifreezing fluid can be used as the heat medium.
- the water-refrigerant heat exchanger 4 placed in the hot water unit 2 and the four-way valve 7 and the decompressor 5 placed in the heat pump unit 1 are connected to each other through the first refrigerant pipe 8c and the second refrigerant pipe 8d.
- the heat pump unit 1 is placed outdoors and the hot water unit 2 is placed indoors.
- Combustible refrigerant is used as the refrigerant which circulates through the heat pump unit 1 and the hot water unit 2.
- the "combustible refrigerant” includes slightly flammable refrigerant in addition to the combustible refrigerant.
- R32 which is the slightly flammable refrigerant, mixture refrigerant including 65wt% or more of R32, or HFO based mixture refrigerant is used, but R290 may be used.
- These refrigerants are combustible refrigerants having density larger than air under atmospheric pressure.
- the hot water tank 15 in which high temperature hot water is store is placed in the hot water unit 2.
- the hot water tank 15 is covered with heat insulating material such as foaming material. According to this, heat retaining property of water stored in the hot water tank 15 is enhanced.
- the water-refrigerant heat exchanger 4 is placed in the hot water unit 2.
- the water-refrigerant heat exchanger 4 produces high temperature heat medium by heat radiation of refrigerant.
- a heat medium path 12a through which heat medium flows is placed in the hot water unit 2.
- the heat medium path 12a includes a bypassing path 12b.
- the bypassing path 12b branches from a three-way valve 16 provided in the heat medium path 12a, and is connected to the heat medium path 12a located upstream of the three-way valve 16 through a heat exchanger 15a provided in the hot water tank 15.
- the heat medium path 12a is connected to the heating terminal 19 through a first heating connecting portion 20a and a second heating connecting portion 20b, and constitutes a heat medium circuit 12.
- the heat medium path 12a connects the first heating connecting portion 20a and the second heating connecting portion 20b to each other. Heat medium from outside of the hot water unit 2 flows into the first heating connecting portion 20a, and heat medium from inside of the hot water unit 2 flows out from the second heating connecting portion 20b.
- a circulation pump 9, the water-refrigerant heat exchanger 4, a heater portion 14 and the three-way valve 16 are provided in this order in the heat medium path 12a from the upstream side (on the side of the first heating connecting portion 20a) with respect to a flowing direction of the heat medium.
- a flow switch 10, an overpressure-releasing valve 11, an expansion tank 13, an air vent valve 17 and a pressure gage 23 are provided in the heat medium path 12a.
- the flow switch 10 detects a flow of hot water.
- the flow switch 10 is located downstream of the circulation pump 9 and the water-refrigerant heat exchanger 4, i.e., the flow switch 10 is located at a position where heat medium after it exchanges heat by the water-refrigerant heat exchanger 4 flows. By placing the flow switch 10 downstream of the circulation pump 9 in this manner, it is possible to detect an operating state of the circulation pump 9.
- the flow switch 10 is provided in the heat medium pipe between the water-refrigerant heat exchanger 4 and the heater portion 14.
- the flow switch 10 may detect a flow rate of the heat medium which flows through the heat medium circuit 12.
- a DC pump is used as the circulation pump 9.
- the circulation pump 9 When the heat pump system is installed, it is necessary to set a flow rate of the heat medium flowing through the heat medium circuit 12 in a predetermined range in accordance with a size and a heat radiation amount of the heating terminal 19 which is provided in the heat medium circuit 12.
- This setting is carried out by a remote controller 22 when the heat pump system is installed.
- a circulation amount of the heat medium caused by the circulation pump 9 can be set by selecting from seven stages by the remote controller 22.
- the heater portion 14 having electric heating means (heater) is placed in a case which forms a flow path. Heat medium flows through the flow path. If the heat medium flows through the heater portion 14, the heat medium is heated to predetermined temperature by the heater.
- the heater portion 14 can be used when outside temperature is low and the heating ability of the heat pump cycle is deteriorated and when the heat medium cannot be heated sufficiently only by heat radiation of the refrigerant in the water-refrigerant heat exchanger 4.
- the heater portion 14 can be used also when the heat pump cycle is out of order.
- the heat medium path 12a is provided with the expansion tank 13 and the overpressure-releasing valve 11 which adjust pressure.
- heat medium in the heat medium circuit 12 can be discharged to outside of the heat medium circuit 12 by the overpressure-releasing valve 11.
- the expansion tank 13 is provided in the heat medium pipe located downstream of the three-way valve 16.
- the overpressure-releasing valve 11 is mounted on the heater portion 14.
- the air vent valve 17 is provided in the heat medium circuit 12 in the hot water unit 2.
- the air vent valve 17 has a function to automatically discharge air stored in the valve to outside. Therefore, by placing the air vent valve 17 in the heat medium circuit 12, air remaining in the heat medium circuit 12 can be discharged to outside of the heat medium circuit 12.
- the air vent valve 17 is provided at the highest position in the heat medium path 12a. Since air in the heat medium circuit 12 is stored at the highest position in the heat medium circuit 12 by its buoyancy force, it is possible to easily vent air in the heat medium circuit 12 by providing the air vent valve 17 at the highest position of the heat medium circuit 12.
- the heat medium path 12a is provided with the pressure gage 23. According to this, it is possible to detect pressure in the heat medium circuit 12.
- the hot water unit 2 is provided therein with the bypassing path 12b which constitutes a portion of the heat medium circuit 12.
- the bypassing path 12b branches from the three-way valve 16, and is connected to the heat medium path 12a between the first heating connecting portion 20a and the circulation pump 9 through the heat exchanger 15a provided in the hot water tank 15.
- the heat medium path 12a located downstream of the heater portion 14 is provided with the three-way valve 16.
- the three-way valve 16 can be switched between a state to flow heat medium heated by the water-refrigerant heat exchanger 4 to the hot water tank 15 and a state to flow the heat medium to downstream of the heat medium path 12a.
- heat medium flows to the hot water tank 15, it is possible to heat water stored in the hot water tank 15 by the heat exchanger 15a. If the heat medium flows to the downstream of the heat medium path 12a, the heat medium can be made to flow to the heating terminal 19 (e.g., radiator or floor heating panel) provided in the heat medium circuit 12 located outside of the hot water unit 2, and a heating operation can be carried out.
- the heating terminal 19 e.g., radiator or floor heating panel
- the three-way valve 16 may be able to adjust a flow rate of heat medium flowing to the hot water tank 15 and a flow rate of heat medium flowing to the downstream of the heat medium path 12a.
- Heat medium which flows through the bypassing path 12b flows in from a connection port 15b located on a relatively upper side with respect to a height direction of the hot water tank 15, and heat medium after it exchanges heat with the heat exchanger 15a flows out from a connection port 15c located on a relatively lower side with respect to the height direction of the hot water tank 15. According to this, it is possible to efficiently heat water in the hot water tank 15.
- the water supply pipe 31 through which water from a water pipe flows is connected to the hot water tank 15. Water from the water pipe flows into a lower location of the hot water tank 15 through a pressure reducing valve 32 and a first hot water supplying connecting portion 30a provided in the hot water unit 2.
- the hot water-discharging pipe 30 through which water in the hot water tank 15 flows out is connected to the hot water tank 15 at a location higher than the water supply pipe 31. Water (hot water) in the hot water tank 15 flows out from an upper portion of the hot water tank 15 into the hot water-discharging pipe 30.
- the water flows to outside of the hot water unit 2 from a second hot water supplying connecting portion 30b, and is supplied to the hot water supply terminal 33 such as a faucet and a shower.
- a combination tap 34 is provided on the upstream side of the hot water supply terminal 33. The combination tap 34 mixes water from the water supply pipe 31 and hot water from the hot water-discharging pipe 30 with each other.
- heat medium is heated by the water-refrigerant heat exchanger 4, and the heated heat medium is made to flow to the heat exchanger 15a, thereby heating water in the hot water tank 15. That is, water in the hot water tank 15 is indirectly heated through heat medium using heat of refrigerant which circulates through the heat pump cycle.
- water which flows through the water supply pipe 31 is heated by heat medium storing in the hot water tank 15 while the water flows through the heat exchanger 15a, the water flows out from the hot water-discharging pipe 30 and is supplied to the hot water supply terminal 33.
- the high temperature heat medium is stored in the hot water tank 15, it is possible to heat water by the heat exchanger 15a and to supply the water to the hot water supply terminal 33 when the hot water supply terminal 33 becomes necessary hot water.
- the first heating connecting portion 20a and the second heating connecting portion 20b provided in the hot water unit 2 are connected to the heating terminal 19 such as the radiator and the flor heating panel by the heat medium pipe 20. According to this, the heat medium path 12a constitutes the heat medium circuit 12.
- the first heating connecting portion 20a and the second heating connecting portion 20b can be attached to and detached from the heat medium pipe 20.
- the heat pump system in this embodiment can execute at least a heating operation to supply heat medium to the heating terminal 19 provided in the heat medium circuit 12 and to heat a room, a hot water-storing operation to store high temperature heat medium or hot water in the hot water tank 15, and a defrosting operation to melt frost adhering to the evaporator 6a.
- the control device 21 starts the heating operation.
- control device 21 drives the compressor 3 of the heat pump cycle and the circulation pump 9 provided in the heat medium circuit 12.
- the control device 21 adjusts an opening of the valve.
- control device 21 switches the three-way valve 16 to the downstream of the heat medium circuit 12. According to this, refrigerant circulates through the heat pump cycle. Further, heat medium circulates through the heat medium circuit 12 and flows through the heating terminal 19.
- refrigerant circulates through the heat pump cycle.
- the refrigerant is compressed by the compressor 3 and is brought into a high temperature and high pressure state.
- the high temperature and high pressure refrigerant flows into the water-refrigerant heat exchanger 4 through the four-way valve 7, and releases heat to the heat medium.
- the refrigerant which flows out from the water-refrigerant heat exchanger 4 is decompressed by the decompressor 5.
- the refrigerant which flows out from the decompressor 5 exchanges heat with air sent by the blower fan 6b in the evaporator 6a, and the refrigerant evaporates. Thereafter, the refrigerant which flows out from the evaporator 6a flows into the compressor 3 through the four-way valve 7, and is again compressed.
- the refrigerant circulates through the heat pump cycle in this manner.
- Heat medium circulates through the heat medium circuit 12 by driving a circulation pump 6.
- the heat medium which circulates through the heat medium circuit 12 is heated to high temperature by heat of the refrigerant in the water-refrigerant heat exchanger 4.
- the three-way valve 16 is set such that heat medium flows to the downstream of the heat medium circuit 12.
- heat medium which flows out from the water-refrigerant heat exchanger 4 and flows through the heater portion 14 flows out into the heat medium circuit 12 located outside of the hot water unit 2 through the three-way valve 16 and the first heating connecting portion 20a, and the heat medium flows into a heating terminal 19 (e.g., floor heating).
- the heat medium releases heat in the heating terminal 19 and thereafter, the heat medium flows from the first heating connecting portion 20a into the heat medium path 12a again.
- the heat medium circulates through the heat medium circuit 12 in this manner.
- the control device 21 controls the heat pump cycle and the circulation pump 9 such that temperature of heat medium which is supplied to the heating terminal 19 becomes equal to predetermined temperature.
- the control device 21 can control the decompressor 5 and the number of rotations of the compressor 3 such that temperature (discharging temperature of hot water) of heat medium which flows out from the water-refrigerant heat exchanger 4 becomes equal to target temperature, and the control device 21 can control the number of rotations of the circulation pump 9 such that temperature (entering temperature of water) of heat medium which flows into the water-refrigerant heat exchanger 4 becomes equal to predetermined temperature.
- control to bring temperature (discharging temperature of hot water) of refrigerant which is discharged from the compressor 3 into predetermined temperature is executed, and the circulation pump 9 controls the entering temperature of water to adjust temperature (entering temperature of water) of heat medium which flows into the water-refrigerant heat exchanger 4.
- the control device 21 heats the heat medium using the heater portion 14.
- the control device 21 When a user instructs to start the hot water-storing operation by the operation of the remote controller 22, or when the control device 21 determines that the hot water-storing operation is necessary due to time slot or temperature of water in the hot water tank 15, the control device 21 starts the hot water-storing operation.
- the control device 21 drives the compressor 3 of the heat pump cycle and the circulation pump 9 provided in the heat medium circuit 12.
- the decompressor 5 is a solenoid expansion valve
- the control device 21 adjusts an opening of the valve.
- the control device 21 switches the three-way valve 16 to the bypassing path 12b. According to this, refrigerant circulates through the heat pump cycle and heat medium flows through the heat exchanger 15a.
- the user can adjust, by the remote controller 22, temperature of heat medium which is supplied to the heat exchanger 15a.
- Heat medium which flows into the bypassing path 12b and flows through the heat exchanger 15a releases heat to water stored in the hot water tank 15 and heats the water. According to this, high temperature water is stored in the hot water tank 15.
- heated water flows out into the hot water-discharging pipe 30, flows out to outside of the hot water unit 2 through the second hot water supplying connecting portion 30b, and the water is supplied to the hot water supply terminal 33. That is, the hot water supplying operation is carried out using the high temperature water stored in the hot water tank 15.
- control device 21 controls the heat pump cycle and the circulation pump 9 such that temperature of heat medium which is supplied to the heat exchanger 15a becomes equal to predetermined temperature.
- control device 21 can control the decompressor 5 and the number of rotations of the compressor 3 such that temperature (discharging temperature of hot water) of heat medium which flows out from the water-refrigerant heat exchanger 4 becomes equal to target temperature, and can control the number of rotations of the circulation pump 9 such that temperature (entering temperature of water) of heat medium which flows into the water-refrigerant heat exchanger 4 becomes equal to predetermined temperature.
- control device 21 heats the heat medium using the heater portion 14.
- control device 21 determines that frost adheres to the evaporator 6a, and the defrosting operation for removing the frost is executed.
- the control device 21 switches a circulation direction of refrigerant by the four-way valve 7. According to this, the refrigerant flows through the compressor 3, the four-way valve 7, the evaporator 6a, the decompressor 5, the water-refrigerant heat exchanger 4, the four-way valve 7 and the compressor 3 in this order. As a result, high temperature and high pressure refrigerant flows into the evaporator 6a, and the defrosting operation is carried out.
- control device 21 When temperature of heat medium which flows into the water-refrigerant heat exchanger 4 is lower than the predetermined temperature, the control device 21 actuates the heater portion 14 and heats the heat medium, and circulates the heated heat medium through the heat medium circuit 12.
- Fig. 3 is a perspective view of a ceiling surface of the hot water unit of the heat pump system of the embodiment
- Fig. 4 is a side view of the hot water unit of the heat pump system of the embodiment.
- the heat pump system includes the first refrigerant pipe 8c through which combustible refrigerant compressed by the compressor 3 of the heat pump unit 1 flows toward the water-refrigerant heat exchanger 4 of the hot water unit 2, and the second refrigerant pipe 8d through which combustible refrigerant releases heat by heating heat medium in the water-refrigerant heat exchanger 4 flows toward the decompressor 5 of the heat pump unit 1.
- the first refrigerant pipe 8c and the second refrigerant pipe 8d connect the heat pump unit 1 and the hot water unit 2 respectively.
- the casing 2a which forms the hot water unit 2 includes a recess 2b which is recessed in a deeper direction than any of standing surfaces composed of a front surface 2aFRONT, a side surface 2aSIDE and a rear surface 2aREAR of the casing 2a, and in a lower direction than a ceiling surface 2aTOP.
- an upper portion of the recess 2b is opened, the recess 2b is formed from three standing walls 2c and a bottom surface 2d located lower than the ceiling surface 2aTOP.
- the recess 2b includes an opening 2e with respect to the standing surface side of the casing 2a.
- An entire first connecting portion 8a which connects heat exchanger hot water unit 2 and the first refrigerant pipe 8c to each other and an entire second connecting portion 8b which connects the hot water unit 2 and the second refrigerant pipe 8d to each other are placed in the recess 2b.
- the upper portion of the recess 2b in the embodiment is opened, but the recess 2b may be provided with a pipe cover or the like.
- the entire first connecting portion 8a and the entire second connecting portion 8b are located at places where a user cannot usually keep an eye on, it is possible to provide a heat pump system having enhanced outward appearance.
- first refrigerant pipe 8c and a portion of the second refrigerant pipe 8d which are respectively connected to the first connecting portion 8a and the second connecting portion 8b are also placed in the recess 2b, and the first refrigerant pipe 8c and the second refrigerant pipe 8d are located at places where a user cannot usually keep an eye on. Therefore, it is possible to provide a heat pump system having the enhanced outward appearance.
- root portions of the first connecting portion 8a and the second connecting portion 8b are placed at the standing wall 2c which is opposed to the opening 2e of the recess 2b.
- a connected portion between the first connecting portion 8a and the second connecting portion 8b is placed facing the opening 2e of the recess 2b.
- the entire first connecting portion 8a and the entire second connecting portion 8b are placed in the recess 2b.
- first connecting portion 8a and the entire second connecting portion 8b are placed in the recess 2b, and the portion of the first refrigerant pipe 8c and the portion of the second refrigerant pipe 8d which are respectively connected to the first connecting portion 8a and the second connecting portion 8b are also placed in the recess 2b, and these elements are located at places where a user cannot usually keep an eye on. Therefore, it is possible to provide a heat pump system having enhanced outward appearance.
- the recess 2b has the opening 2e facing the rear surface 2aREAR of the casing 2a.
- the first refrigerant pipe 8c connected to the first connecting portion 8a of the hot water unit 2 and the second refrigerant pipe 8d connected to the second connecting portion 8b of the hot water unit 2 can be placed behind the rear surface of the casing 2a of the hot water unit 2 through the opening 2e of the recess 2b.
- the entire first connecting portion 8a and the entire second connecting portion 8b are placed in the recess 2b, and the portion of the first refrigerant pipe 8c and the portion of the second refrigerant pipe 8d which are respectively connected to the first connecting portion 8a and the second connecting portion 8b are also placed in the recess 2b and thereafter, the first refrigerant pipe 8c and the second refrigerant pipe 8d facing the heat pump unit 1 can be placed behind the rear surface of the casing 2a of the hot water unit 2 through the opening 2e of the recess 2b.
- the first connecting portion 8a, the second connecting portion 8b, the first refrigerant pipe 8c and the second refrigerant pipe 8d are located at places where a user cannot keep an eye on. Therefore, it is possible to provide a heat pump system having the enhanced outward appearance.
- the refrigerant is the combustible refrigerant having density larger than air under atmospheric pressure
- the first connecting portion 8a which connects the hot water unit 2 and the first refrigerant pipe 8c to each other and the second connecting portion 8b which connects the hot water unit 2 and the second refrigerant pipe 8d to each other are provided on the side of the ceiling surface of the casing 2a of the hot water unit 2.
- the connecting portion which connects a pipe to a product and at least a portion of a pipe which is connected to the connecting portion are located at places where a user cannot usually keep an eye on. Therefore, it is possible to provide a heat pump system having enhanced outward appearance and thus, the invention can be applied to a hot water supplying system, a hot water heater and the like.
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- Heat-Pump Type And Storage Water Heaters (AREA)
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Abstract
Description
- The present invention relates to a heat pump system for producing hot water using a heat pump cycle.
- Conventionally, according to a configuration of the heat pump system of this kind, a heat pump unit is placed on a ceiling surface of a hot water tank unit having a hot water tank.
- The ceiling surface of the hot water tank unit is provided with two pipe-connecting portions projecting from an outer surface thereof. A casing of the heat pump unit is also provided with two pipe-connecting portions projecting from an outer surface thereof.
- The hot water tank unit and the heat pump unit have such a configuration that water circulates through a hot water unit and the heat pump unit by connecting these two pipe-connecting portions to each other through two pipes.
- [Patent Document 1] Japanese Patent Application Laid-open No.
2011-122752 - According to the conventional configuration, however, since the pipe-connecting portions project from the ceiling surface of the hot water tank unit, a connecting portion which connects a pipe to the former pipe or a product can easily be seen from a user and therefore, there is a problem that outward appearance of the product is deteriorated.
- The present invention solves the conventional problem and it is an object of the invention to provide a heat pump system which enhances outward appearance by placing a connecting portion which connects a pipe to a product or at least a portion of a pipe which is connected to the connecting portion in a place where a user cannot usually keep an eye on.
- To solve the conventional problem, the present invention provides a heat pump system including: a heat pump unit where a compressor, a decompressor and an evaporator are placed; a hot water unit where at least a water-refrigerant heat exchanger is placed; a first refrigerant pipe through which refrigerant compressed by the compressor flows toward the water-refrigerant heat exchanger; and a second refrigerant pipe through which the refrigerant after it releases heat in the water-refrigerant heat exchanger flows toward the decompressor, in which the first refrigerant pipe and the second refrigerant pipe connect the heat pump unit and the hot water unit to each other, wherein a casing which forms the hot water unit includes a recess which is recessed in a deeper direction than standing surfaces and in a lower direction than a ceiling surface, and a first connecting portion which connects the hot water unit and the first refrigerant pipe to each other and a second connecting portion which connects the hot water unit and the second refrigerant pipe to each other are placed in the recess.
- According to this, the casing which forms the hot water unit includes the recess which is recessed in the deeper direction than the standing surface and in the lower direction than the ceiling surface, and the first connecting portion which connects the hot water unit and the first refrigerant pipe to each other and the second connecting portion which connects the hot water unit and the second refrigerant pipe to each other are placed in the recess. Therefore, since the first connecting portion and the second connecting portion are located in a place where a user cannot usually keep an eye on, it is possible to provide a heat pump system which enhances the outward appearance.
- A portion of the first refrigerant pipe which is connected to the first connecting portion and a portion of the second refrigerant pipe which is connected to the second connecting portion are also placed in the recess. Therefore, since these portions are located in a place where a user cannot usually keep an eye on, it is possible to provide a heat pump system which enhances the outward appearance.
- According to the present invention, a connecting portion which connects a pipe to a produce and at least a portion of a pipe connected to the connecting portion are located in place where a user cannot usually keep an eye on. Therefore, it is possible to provide a heat pump system which enhances the outward appearance.
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Fig. 1 is a circuit diagram of a heat pump system in an embodiment of the present invention; -
Fig. 2 is a diagram showing a connection configuration of the heat pump system; -
Fig. 3 is a perspective view of a ceiling surface of a hot water unit of the heat pump system; and -
Fig. 4 is a side view of the hot water unit of the heat pump system. - A first aspect of the present invention provides a heat pump system including: a heat pump unit where a compressor, a decompressor and an evaporator are placed; a hot water unit where at least a water-refrigerant heat exchanger is placed; a first refrigerant pipe through which refrigerant compressed by the compressor flows toward the water-refrigerant heat exchanger; and a second refrigerant pipe through which the refrigerant after it releases heat in the water-refrigerant heat exchanger flows toward the decompressor, in which the first refrigerant pipe and the second refrigerant pipe connect the heat pump unit and the hot water unit to each other, wherein a casing which forms the hot water unit includes a recess which is recessed in a deeper direction than standing surfaces and in a lower direction than a ceiling surface, and a first connecting portion which connects the hot water unit and the first refrigerant pipe to each other and a second connecting portion which connects the hot water unit and the second refrigerant pipe to each other are placed in the recess.
- According to this, the casing which forms the hot water unit includes the recess which is recessed in the deeper direction than the standing surface and in the lower direction than the ceiling surface, and the first connecting portion which connects the hot water unit and the first refrigerant pipe to each other and the second connecting portion which connects the hot water unit and the second refrigerant pipe to each other are placed in the recess. Therefore, since the first connecting portion and the second connecting portion are located in a place where a user cannot usually keep an eye on, it is possible to provide a heat pump system which enhances the outward appearance.
- A portion of the first refrigerant pipe which is connected to the first connecting portion and a portion of the second refrigerant pipe which is connected to the second connecting portion are also placed in the recess. Therefore, since these portions are located in a place where a user cannot usually keep an eye on, it is possible to provide a heat pump system which enhances the outward appearance.
- According to a second aspect of the invention, in the first aspect, longitudinal directions of the first connecting portion and the second connecting portion are placed substantially in a horizontal direction.
- According to this, operations to connect the first connecting portion and the first refrigerant pipe to each other and connect the second connecting portion and the second refrigerant pipe to each other become easy, and it is possible to enhance operation efficiency of an operation to connect the hot water unit and the refrigerant pipe to each other. Further, it is possible to reduce a height of the recess, and an interior content of the hot water unit can be increased.
- According to a third aspect of the invention, in any of the first and second aspects, the recess opens toward a rear surface of the casing.
- According to this, the first refrigerant pipe which is connected to the first connecting portion of the hot water unit and the second refrigerant pipe which is connected to the second connecting portion of the hot water unit can be placed behind a rear surface of the casing of the hot water unit through the opening.
- Therefore, the first connecting portion and the second connecting portion which are provided in the hot water unit, as well as the first refrigerant pipe and the second refrigerant pipe which are respectively connected to the first connecting portion and the second connecting portion are also located in the place where a user cannot usually keep an eye on. Therefore, it is possible to provide the heat pump system which further enhances the outward appearance.
- According to a fourth aspect of the invention, in any one of the first to third aspects, a hot water tank is placed in the hot water unit.
- According to this, it is possible to provide a heat pump system capable of supplying hot water from the hot water tank.
- According to a fifth aspect of the invention, in any one of the first to fourth aspects, the refrigerant is combustible refrigerant.
- According to this, the refrigerant is the combustible refrigerant having density larger than air under atmospheric pressure. The first connecting portion which connects the hot water unit and the first refrigerant pipe to each other and the second connecting portion which connects the hot water unit and the second refrigerant pipe to each other are provided on the side of the ceiling surface of the hot water unit.
- Therefore, even if the combustible refrigerant leaks from the first connecting portion or the second connecting portion, the combustible refrigerant diffuses vertically downward centering around the hot water unit. At that time, since its density is also diluted, a possibility of inflammability can be lowered.
- An embodiment of the present invention will be described below with reference to the drawings. The invention is not limited to the embodiment.
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Fig. 1 is a circuit diagram of a heat pump system in an embodiment of the present invention. The heat pump system of the embodiment includes aheat pump unit 1 placed outdoors and ahot water unit 2 placed indoors. - The
hot water unit 2 is connected to aheating terminal 19 through aheat medium pipe 20. Awater supply pipe 31 for supplying water from a water pipe or the like to thehot water unit 2, and a hot water-dischargingpipe 30 for supplying hot water to the hotwater supply terminal 33 are connected to thehot water unit 2. -
Fig. 2 is a diagram showing a connection configuration of the heat pump system of the embodiment. Theheat pump unit 1 and thehot water unit 2 of the heat pump system are connected to each other through afirst refrigerant pipe 8c and asecond refrigerant pipe 8d. - The
heat pump unit 1 and thehot water unit 2 are connected to each other through anelectric wiring 18. A control signal is transmitted from a control device 21 (seeFig. 1 ) provided in thehot water unit 2 to theheat pump unit 1 through theelectric wiring 18. - The
hot water unit 2 and the heating terminal 19 (e.g., floor heating) are connected to each other through theheat medium pipe 20. The hot water-dischargingpipe 30 is connected to thehot water unit 2. Hot water is supplied to the hotwater supply terminal 33 through the hot water-dischargingpipe 30. - The
water supply pipe 31 is connected to thehot water unit 2. Water is supplied to ahot water tank 15 through thewater supply pipe 31. - As shown in
Fig. 1 , theheat pump unit 1 includes acompressor 3 which compresses refrigerant and discharges high temperature refrigerant, adecompressor 5 which decompresses refrigerant, anevaporator 6a which exchanges heat between air and refrigerant, and a four-way valve 7 which changes a flowing path of the refrigerant. - The
compressor 3, thedecompressor 5, theevaporator 6a and the four-way valve 7 are connected to one another through refrigerant pipes. A solenoid expansion valve or a capillary tube is used as thedecompressor 5. Further, theheat pump unit 1 is provided with ablower fan 6b for sending a wind to theevaporator 6a and facilitating heat exchange between air and refrigerant. Theheat pump unit 1 is provided with acasing 2a (seeFig. 3 ) for covering thecompressor 3, thedecompressor 5, theevaporator 6a, theblower fan 6b and the four-way valve 7. - A water-
refrigerant heat exchanger 4 which exchanges heat between heat medium and high temperature refrigerant to produce high temperature heat medium is placed in thehot water unit 2. The water-refrigerant heat exchanger 4 is annularly connected through the refrigerant pipe together with thecompressor 3, thedecompressor 5, theevaporator 6a and the four-way valve 7 and constitutes a heat pump cycle. - For example, a plate type heat exchanger can be used as the water-
refrigerant heat exchanger 4. Alternatively, a double-pipe type heat exchanger having a heat medium pipe and a refrigerant pipe can also be used as the water-refrigerant heat exchanger 4. Heat medium flows through the heat medium pipe and refrigerant flows through the refrigerant pipe. The heat medium pipe is placed in the refrigerant pipe. Water or antifreezing fluid can be used as the heat medium. - The water-
refrigerant heat exchanger 4 placed in thehot water unit 2 and the four-way valve 7 and thedecompressor 5 placed in theheat pump unit 1 are connected to each other through the firstrefrigerant pipe 8c and thesecond refrigerant pipe 8d. Here, theheat pump unit 1 is placed outdoors and thehot water unit 2 is placed indoors. - Combustible refrigerant is used as the refrigerant which circulates through the
heat pump unit 1 and thehot water unit 2. In this embodiment, the "combustible refrigerant" includes slightly flammable refrigerant in addition to the combustible refrigerant. - That is, as the refrigerant which circulates through the
heat pump unit 1 and thehot water unit 2, R32 which is the slightly flammable refrigerant, mixture refrigerant including 65wt% or more of R32, or HFO based mixture refrigerant is used, but R290 may be used. These refrigerants are combustible refrigerants having density larger than air under atmospheric pressure. - The
hot water tank 15 in which high temperature hot water is store is placed in thehot water unit 2. Thehot water tank 15 is covered with heat insulating material such as foaming material. According to this, heat retaining property of water stored in thehot water tank 15 is enhanced. - The water-
refrigerant heat exchanger 4 is placed in thehot water unit 2. The water-refrigerant heat exchanger 4 produces high temperature heat medium by heat radiation of refrigerant. Aheat medium path 12a through which heat medium flows is placed in thehot water unit 2. Theheat medium path 12a includes a bypassingpath 12b. The bypassingpath 12b branches from a three-way valve 16 provided in theheat medium path 12a, and is connected to theheat medium path 12a located upstream of the three-way valve 16 through aheat exchanger 15a provided in thehot water tank 15. - The
heat medium path 12a is connected to theheating terminal 19 through a firstheating connecting portion 20a and a secondheating connecting portion 20b, and constitutes aheat medium circuit 12. Theheat medium path 12a connects the firstheating connecting portion 20a and the secondheating connecting portion 20b to each other. Heat medium from outside of thehot water unit 2 flows into the firstheating connecting portion 20a, and heat medium from inside of thehot water unit 2 flows out from the secondheating connecting portion 20b. - A
circulation pump 9, the water-refrigerant heat exchanger 4, aheater portion 14 and the three-way valve 16 are provided in this order in theheat medium path 12a from the upstream side (on the side of the firstheating connecting portion 20a) with respect to a flowing direction of the heat medium. Aflow switch 10, an overpressure-releasingvalve 11, anexpansion tank 13, anair vent valve 17 and apressure gage 23 are provided in theheat medium path 12a. - The
flow switch 10 detects a flow of hot water. Theflow switch 10 is located downstream of thecirculation pump 9 and the water-refrigerant heat exchanger 4, i.e., theflow switch 10 is located at a position where heat medium after it exchanges heat by the water-refrigerant heat exchanger 4 flows. By placing theflow switch 10 downstream of thecirculation pump 9 in this manner, it is possible to detect an operating state of thecirculation pump 9. - In this embodiment, the
flow switch 10 is provided in the heat medium pipe between the water-refrigerant heat exchanger 4 and theheater portion 14. Theflow switch 10 may detect a flow rate of the heat medium which flows through theheat medium circuit 12. - In this embodiment, a DC pump is used as the
circulation pump 9. When the heat pump system is installed, it is necessary to set a flow rate of the heat medium flowing through theheat medium circuit 12 in a predetermined range in accordance with a size and a heat radiation amount of theheating terminal 19 which is provided in theheat medium circuit 12. - This setting is carried out by a
remote controller 22 when the heat pump system is installed. In this embodiment, a circulation amount of the heat medium caused by thecirculation pump 9 can be set by selecting from seven stages by theremote controller 22. - In the
heat medium circuit 12, theheater portion 14 having electric heating means (heater) is placed in a case which forms a flow path. Heat medium flows through the flow path. If the heat medium flows through theheater portion 14, the heat medium is heated to predetermined temperature by the heater. - The
heater portion 14 can be used when outside temperature is low and the heating ability of the heat pump cycle is deteriorated and when the heat medium cannot be heated sufficiently only by heat radiation of the refrigerant in the water-refrigerant heat exchanger 4. Theheater portion 14 can be used also when the heat pump cycle is out of order. - The
heat medium path 12a is provided with theexpansion tank 13 and the overpressure-releasingvalve 11 which adjust pressure. By heating the heat medium by the water-refrigerant heat exchanger 4, if a volume of the heat medium in theheat medium circuit 12 expands, heat medium of the volume expanded amount is absorbed by theexpansion tank 13. - If internal pressure of the
heat medium circuit 12 rises to predetermined pressure or higher, heat medium in theheat medium circuit 12 can be discharged to outside of theheat medium circuit 12 by the overpressure-releasingvalve 11. In this embodiment, theexpansion tank 13 is provided in the heat medium pipe located downstream of the three-way valve 16. The overpressure-releasingvalve 11 is mounted on theheater portion 14. - The
air vent valve 17 is provided in theheat medium circuit 12 in thehot water unit 2. Theair vent valve 17 has a function to automatically discharge air stored in the valve to outside. Therefore, by placing theair vent valve 17 in theheat medium circuit 12, air remaining in theheat medium circuit 12 can be discharged to outside of theheat medium circuit 12. - The
air vent valve 17 is provided at the highest position in theheat medium path 12a. Since air in theheat medium circuit 12 is stored at the highest position in theheat medium circuit 12 by its buoyancy force, it is possible to easily vent air in theheat medium circuit 12 by providing theair vent valve 17 at the highest position of theheat medium circuit 12. Theheat medium path 12a is provided with thepressure gage 23. According to this, it is possible to detect pressure in theheat medium circuit 12. - The
hot water unit 2 is provided therein with the bypassingpath 12b which constitutes a portion of theheat medium circuit 12. The bypassingpath 12b branches from the three-way valve 16, and is connected to theheat medium path 12a between the firstheating connecting portion 20a and thecirculation pump 9 through theheat exchanger 15a provided in thehot water tank 15. - The
heat medium path 12a located downstream of theheater portion 14 is provided with the three-way valve 16. The three-way valve 16 can be switched between a state to flow heat medium heated by the water-refrigerant heat exchanger 4 to thehot water tank 15 and a state to flow the heat medium to downstream of theheat medium path 12a. - According to this, if heat medium flows to the
hot water tank 15, it is possible to heat water stored in thehot water tank 15 by theheat exchanger 15a. If the heat medium flows to the downstream of theheat medium path 12a, the heat medium can be made to flow to the heating terminal 19 (e.g., radiator or floor heating panel) provided in theheat medium circuit 12 located outside of thehot water unit 2, and a heating operation can be carried out. - Among heat media which flow out from the water-
refrigerant heat exchanger 4, the three-way valve 16 may be able to adjust a flow rate of heat medium flowing to thehot water tank 15 and a flow rate of heat medium flowing to the downstream of theheat medium path 12a. - Heat medium which flows through the bypassing
path 12b flows in from aconnection port 15b located on a relatively upper side with respect to a height direction of thehot water tank 15, and heat medium after it exchanges heat with theheat exchanger 15a flows out from aconnection port 15c located on a relatively lower side with respect to the height direction of thehot water tank 15. According to this, it is possible to efficiently heat water in thehot water tank 15. - The
water supply pipe 31 through which water from a water pipe flows is connected to thehot water tank 15. Water from the water pipe flows into a lower location of thehot water tank 15 through apressure reducing valve 32 and a first hot water supplying connectingportion 30a provided in thehot water unit 2. - The hot water-discharging
pipe 30 through which water in thehot water tank 15 flows out is connected to thehot water tank 15 at a location higher than thewater supply pipe 31. Water (hot water) in thehot water tank 15 flows out from an upper portion of thehot water tank 15 into the hot water-dischargingpipe 30. - Thereafter, the water (hot water) flows to outside of the
hot water unit 2 from a second hot water supplying connectingportion 30b, and is supplied to the hotwater supply terminal 33 such as a faucet and a shower. Acombination tap 34 is provided on the upstream side of the hotwater supply terminal 33. The combination tap 34 mixes water from thewater supply pipe 31 and hot water from the hot water-dischargingpipe 30 with each other. - In this embodiment, heat medium is heated by the water-
refrigerant heat exchanger 4, and the heated heat medium is made to flow to theheat exchanger 15a, thereby heating water in thehot water tank 15. That is, water in thehot water tank 15 is indirectly heated through heat medium using heat of refrigerant which circulates through the heat pump cycle. - That is, according to this embodiment, water which flows through the
water supply pipe 31 is heated by heat medium storing in thehot water tank 15 while the water flows through theheat exchanger 15a, the water flows out from the hot water-dischargingpipe 30 and is supplied to the hotwater supply terminal 33. According to this, if the high temperature heat medium is stored in thehot water tank 15, it is possible to heat water by theheat exchanger 15a and to supply the water to the hotwater supply terminal 33 when the hotwater supply terminal 33 becomes necessary hot water. - The first
heating connecting portion 20a and the secondheating connecting portion 20b provided in thehot water unit 2 are connected to theheating terminal 19 such as the radiator and the flor heating panel by theheat medium pipe 20. According to this, theheat medium path 12a constitutes theheat medium circuit 12. The firstheating connecting portion 20a and the secondheating connecting portion 20b can be attached to and detached from theheat medium pipe 20. - Next, operation of the heat pump system in this embodiment will be described below.
- The heat pump system in this embodiment can execute at least a heating operation to supply heat medium to the
heating terminal 19 provided in theheat medium circuit 12 and to heat a room, a hot water-storing operation to store high temperature heat medium or hot water in thehot water tank 15, and a defrosting operation to melt frost adhering to theevaporator 6a. - These operations are started when a user instructs to start the operation by the
remote controller 22 or when thecontrol device 21 of the heat pump system determines that it is necessary to execute the operation due to time slot or temperature around the heat pump system. - When the user instructs to start the heating operation by the operation of the
remote controller 22, or when thecontrol device 21 determines that the heating operation is necessary due to temperature and the like in the room, thecontrol device 21 starts the heating operation. - In the heating operation, the
control device 21 drives thecompressor 3 of the heat pump cycle and thecirculation pump 9 provided in theheat medium circuit 12. When thedecompressor 5 is a solenoid expansion valve, thecontrol device 21 adjusts an opening of the valve. - In the heating operation, the
control device 21 switches the three-way valve 16 to the downstream of theheat medium circuit 12. According to this, refrigerant circulates through the heat pump cycle. Further, heat medium circulates through theheat medium circuit 12 and flows through theheating terminal 19. - If the
compressor 3 is driven, refrigerant circulates through the heat pump cycle. The refrigerant is compressed by thecompressor 3 and is brought into a high temperature and high pressure state. The high temperature and high pressure refrigerant flows into the water-refrigerant heat exchanger 4 through the four-way valve 7, and releases heat to the heat medium. - The refrigerant which flows out from the water-
refrigerant heat exchanger 4 is decompressed by thedecompressor 5. The refrigerant which flows out from thedecompressor 5 exchanges heat with air sent by theblower fan 6b in theevaporator 6a, and the refrigerant evaporates. Thereafter, the refrigerant which flows out from theevaporator 6a flows into thecompressor 3 through the four-way valve 7, and is again compressed. The refrigerant circulates through the heat pump cycle in this manner. - Heat medium circulates through the
heat medium circuit 12 by driving a circulation pump 6. The heat medium which circulates through theheat medium circuit 12 is heated to high temperature by heat of the refrigerant in the water-refrigerant heat exchanger 4. Here, the three-way valve 16 is set such that heat medium flows to the downstream of theheat medium circuit 12. - Hence, heat medium which flows out from the water-
refrigerant heat exchanger 4 and flows through theheater portion 14 flows out into theheat medium circuit 12 located outside of thehot water unit 2 through the three-way valve 16 and the firstheating connecting portion 20a, and the heat medium flows into a heating terminal 19 (e.g., floor heating). The heat medium releases heat in theheating terminal 19 and thereafter, the heat medium flows from the firstheating connecting portion 20a into theheat medium path 12a again. The heat medium circulates through theheat medium circuit 12 in this manner. - The
control device 21 controls the heat pump cycle and thecirculation pump 9 such that temperature of heat medium which is supplied to theheating terminal 19 becomes equal to predetermined temperature. For example, thecontrol device 21 can control thedecompressor 5 and the number of rotations of thecompressor 3 such that temperature (discharging temperature of hot water) of heat medium which flows out from the water-refrigerant heat exchanger 4 becomes equal to target temperature, and thecontrol device 21 can control the number of rotations of thecirculation pump 9 such that temperature (entering temperature of water) of heat medium which flows into the water-refrigerant heat exchanger 4 becomes equal to predetermined temperature. - That is, in the heat pump cycle, control to bring temperature (discharging temperature of hot water) of refrigerant which is discharged from the
compressor 3 into predetermined temperature is executed, and thecirculation pump 9 controls the entering temperature of water to adjust temperature (entering temperature of water) of heat medium which flows into the water-refrigerant heat exchanger 4. When heat medium cannot be heated sufficiently only by the heat pump cycle, thecontrol device 21 heats the heat medium using theheater portion 14. - When a user instructs to start the hot water-storing operation by the operation of the
remote controller 22, or when thecontrol device 21 determines that the hot water-storing operation is necessary due to time slot or temperature of water in thehot water tank 15, thecontrol device 21 starts the hot water-storing operation. - In the hot water-storing operation, the
control device 21 drives thecompressor 3 of the heat pump cycle and thecirculation pump 9 provided in theheat medium circuit 12. When thedecompressor 5 is a solenoid expansion valve, thecontrol device 21 adjusts an opening of the valve. - In the hot water-storing operation, the
control device 21 switches the three-way valve 16 to the bypassingpath 12b. According to this, refrigerant circulates through the heat pump cycle and heat medium flows through theheat exchanger 15a. The user can adjust, by theremote controller 22, temperature of heat medium which is supplied to theheat exchanger 15a. - Heat medium which flows into the bypassing
path 12b and flows through theheat exchanger 15a releases heat to water stored in thehot water tank 15 and heats the water. According to this, high temperature water is stored in thehot water tank 15. - In a hot water supplying operation, heated water flows out into the hot water-discharging
pipe 30, flows out to outside of thehot water unit 2 through the second hot water supplying connectingportion 30b, and the water is supplied to the hotwater supply terminal 33. That is, the hot water supplying operation is carried out using the high temperature water stored in thehot water tank 15. - In the hot water-storing operation, the
control device 21 controls the heat pump cycle and thecirculation pump 9 such that temperature of heat medium which is supplied to theheat exchanger 15a becomes equal to predetermined temperature. - For example, the
control device 21 can control thedecompressor 5 and the number of rotations of thecompressor 3 such that temperature (discharging temperature of hot water) of heat medium which flows out from the water-refrigerant heat exchanger 4 becomes equal to target temperature, and can control the number of rotations of thecirculation pump 9 such that temperature (entering temperature of water) of heat medium which flows into the water-refrigerant heat exchanger 4 becomes equal to predetermined temperature. - When heat medium cannot be heated sufficiently only by the heat pump cycle, the
control device 21 heats the heat medium using theheater portion 14. - When outside air temperature becomes equal to or lower than predetermined temperature or when temperature of refrigerant which flows through the
evaporator 6a becomes equal to or lower than predetermined temperature, thecontrol device 21 determines that frost adheres to theevaporator 6a, and the defrosting operation for removing the frost is executed. - In the defrosting operation, the
control device 21 switches a circulation direction of refrigerant by the four-way valve 7. According to this, the refrigerant flows through thecompressor 3, the four-way valve 7, theevaporator 6a, thedecompressor 5, the water-refrigerant heat exchanger 4, the four-way valve 7 and thecompressor 3 in this order. As a result, high temperature and high pressure refrigerant flows into theevaporator 6a, and the defrosting operation is carried out. - When temperature of heat medium which flows into the water-
refrigerant heat exchanger 4 is lower than the predetermined temperature, thecontrol device 21 actuates theheater portion 14 and heats the heat medium, and circulates the heated heat medium through theheat medium circuit 12. - According to this, it is possible to prevent heat medium in the
heat medium circuit 12 from being frozen. When the defrosting operation is carried out while the heating operation or the hot water-storing operation is being executed, it is possible to suppress temperature of heat medium supplied to theheating terminal 19 or theheat exchanger 15a from lowering, and usability is enhanced. - Next, a connecting configuration between the
heat pump unit 1 and thehot water unit 2 through the firstrefrigerant pipe 8c and thesecond refrigerant pipe 8d in the heat pump system will be described. -
Fig. 3 is a perspective view of a ceiling surface of the hot water unit of the heat pump system of the embodiment, andFig. 4 is a side view of the hot water unit of the heat pump system of the embodiment. - In
Fig. 3 , the heat pump system includes the firstrefrigerant pipe 8c through which combustible refrigerant compressed by thecompressor 3 of theheat pump unit 1 flows toward the water-refrigerant heat exchanger 4 of thehot water unit 2, and thesecond refrigerant pipe 8d through which combustible refrigerant releases heat by heating heat medium in the water-refrigerant heat exchanger 4 flows toward thedecompressor 5 of theheat pump unit 1. - The first
refrigerant pipe 8c and thesecond refrigerant pipe 8d connect theheat pump unit 1 and thehot water unit 2 respectively. - The
casing 2a which forms thehot water unit 2 includes arecess 2b which is recessed in a deeper direction than any of standing surfaces composed of a front surface 2aFRONT, a side surface 2aSIDE and a rear surface 2aREAR of thecasing 2a, and in a lower direction than a ceiling surface 2aTOP. - As shown in
Fig. 3 , an upper portion of therecess 2b is opened, therecess 2b is formed from three standingwalls 2c and abottom surface 2d located lower than the ceiling surface 2aTOP. Therecess 2b includes an opening 2e with respect to the standing surface side of thecasing 2a. An entire first connectingportion 8a which connects heat exchangerhot water unit 2 and the firstrefrigerant pipe 8c to each other and an entire second connectingportion 8b which connects thehot water unit 2 and thesecond refrigerant pipe 8d to each other are placed in therecess 2b. The upper portion of therecess 2b in the embodiment is opened, but therecess 2b may be provided with a pipe cover or the like. - According to this, since the entire first connecting
portion 8a and the entire second connectingportion 8b are located at places where a user cannot usually keep an eye on, it is possible to provide a heat pump system having enhanced outward appearance. - In addition, a portion of the first
refrigerant pipe 8c and a portion of thesecond refrigerant pipe 8d which are respectively connected to the first connectingportion 8a and the second connectingportion 8b are also placed in therecess 2b, and the firstrefrigerant pipe 8c and thesecond refrigerant pipe 8d are located at places where a user cannot usually keep an eye on. Therefore, it is possible to provide a heat pump system having the enhanced outward appearance. - Longitudinal directions of the first connecting
portion 8a and the second connectingportion 8b are placed substantially in the horizontal direction. The expression "substantially in the horizontal direction" includes "slightly inclined". - At that time, root portions of the first connecting
portion 8a and the second connectingportion 8b are placed at the standingwall 2c which is opposed to the opening 2e of therecess 2b. A connected portion between the first connectingportion 8a and the second connectingportion 8b is placed facing the opening 2e of therecess 2b. In this case also, the entire first connectingportion 8a and the entire second connectingportion 8b are placed in therecess 2b. - According to this, it becomes easy to connect the first connecting
portion 8a and the firstrefrigerant pipe 8c to each other and connect the second connectingportion 8b and thesecond refrigerant pipe 8d to each other, and operation efficiency of the operation to connect thehot water unit 2 and the refrigerant pipe to each other can be enhanced. A height of therecess 2b can be lowered, and the interior content of thehot water unit 2 can be increased. - Of course, since the entire first connecting
portion 8a and the entire second connectingportion 8b are placed in therecess 2b, and the portion of the firstrefrigerant pipe 8c and the portion of thesecond refrigerant pipe 8d which are respectively connected to the first connectingportion 8a and the second connectingportion 8b are also placed in therecess 2b, and these elements are located at places where a user cannot usually keep an eye on. Therefore, it is possible to provide a heat pump system having enhanced outward appearance. - Among the standing surfaces composed of the front surface 2aFRONT, the side surface 2aSIDE and the rear surface 2aREAR of the
casing 2a, it is preferable that therecess 2b has the opening 2e facing the rear surface 2aREAR of thecasing 2a. - This is because that if the
recess 2b has the opening 2e facing the rear surface 2aREAR of thecasing 2a, the firstrefrigerant pipe 8c connected to the first connectingportion 8a of thehot water unit 2 and thesecond refrigerant pipe 8d connected to the second connectingportion 8b of thehot water unit 2 can be placed behind the rear surface of thecasing 2a of thehot water unit 2 through the opening 2e of therecess 2b. - According to this, the entire first connecting
portion 8a and the entire second connectingportion 8b are placed in therecess 2b, and the portion of the firstrefrigerant pipe 8c and the portion of thesecond refrigerant pipe 8d which are respectively connected to the first connectingportion 8a and the second connectingportion 8b are also placed in therecess 2b and thereafter, the firstrefrigerant pipe 8c and thesecond refrigerant pipe 8d facing theheat pump unit 1 can be placed behind the rear surface of thecasing 2a of thehot water unit 2 through the opening 2e of therecess 2b. - That is, in the
hot water unit 2 placed indoors such that its rear surface side usually faces the wall side, even if a user sees thehot water unit 2 from front, the first connectingportion 8a, the second connectingportion 8b, the firstrefrigerant pipe 8c and thesecond refrigerant pipe 8d are located at places where a user cannot keep an eye on. Therefore, it is possible to provide a heat pump system having the enhanced outward appearance. - In this embodiment, the refrigerant is the combustible refrigerant having density larger than air under atmospheric pressure, and the first connecting
portion 8a which connects thehot water unit 2 and the firstrefrigerant pipe 8c to each other and the second connectingportion 8b which connects thehot water unit 2 and thesecond refrigerant pipe 8d to each other are provided on the side of the ceiling surface of thecasing 2a of thehot water unit 2. - Hence, even if combustible refrigerant leaks from the first connecting
portion 8a or the second connectingportion 8b, the combustible refrigerant diffuses vertically downward centering around thehot water unit 2 and the density thereof is diluted at that time. Therefore, a possibility of inflammability can be lowered. - According to the present invention, as described above, the connecting portion which connects a pipe to a product and at least a portion of a pipe which is connected to the connecting portion are located at places where a user cannot usually keep an eye on. Therefore, it is possible to provide a heat pump system having enhanced outward appearance and thus, the invention can be applied to a hot water supplying system, a hot water heater and the like.
-
- 1
- heat pump unit
- 2
- hot water unit
- 2a
- casing
- 2aTOP
- ceiling surface
- 2aFRONT
- front surface (standing surface)
- 2aSIDE
- side surface (standing surface)
- 2aREAR
- rear surface (standing surface)
- 2b
- recess
- 2c
- standing walls
- 2d
- bottom surface
- 2e
- opening
- 3
- compressor
- 4
- water-refrigerant heat exchanger
- 5
- decompressor
- 6a
- evaporator
- 7
- four-way valve
- 8a
- first connecting portion
- 8b
- second connecting portion
- 8c
- first refrigerant pipe
- 8d
- second refrigerant pipe
- 11
- overpressure-releasing valve
- 12
- heat medium circuit
- 12a
- heat medium path
- 12b
- bypassing path
- 15
- hot water tank
- 15a
- heat exchanger
- 17
- air vent valve
- 19
- heating terminal
- 20
- heat medium pipe
- 20a
- first heating connecting portion
- 20b
- second heating connecting portion
- 21
- control device
- 22
- remote controller
- 23
- pressure gage
- 30a
- first hot water supplying connecting portion
- 30b
- second hot water supplying connecting portion
Claims (5)
- A heat pump system comprising:a heat pump unit (1) where a compressor (3), a decompressor (5) and an evaporator (6a) are placed;a hot water unit (2) where at least a water-refrigerant heat exchanger (4) is placed;a first refrigerant pipe (8c) through which refrigerant compressed by the compressor (3) flows toward the water-refrigerant heat exchanger (4); anda second refrigerant pipe (8d) through which the refrigerant after it releases heat in the water-refrigerant heat exchanger (4) flows toward the decompressor (5), in whichthe first refrigerant pipe (8c) and the second refrigerant pipe (8d) connect the heat pump unit (1) and the hot water unit (2) to each other, whereina casing (2a) which forms the hot water unit (2) includes a recess (2b) which is recessed in a deeper direction than standing surfaces (2aFRONT, 2aSIDE, 2aREAR) and in a lower direction than a ceiling surface (2aTOP), anda first connecting portion (8a) which connects the hot water unit (2) and the first refrigerant pipe (8c) to each other and a second connecting portion (8b) which connects the hot water unit (2) and the second refrigerant pipe (8d) to each other are placed in the recess (2b).
- The heat pump system according to claim 1, wherein longitudinal directions of the first connecting portion (8a) and the second connecting portion (8b) are placed substantially in a horizontal direction.
- The heat pump system according to claim 1 or 2, wherein the recess (2b) opens toward a rear surface (2aREAR) of the casing (2a).
- The heat pump system according to any one of claims 1 to 3, wherein a hot water tank (15) is placed in the hot water unit (2).
- The heat pump system according to any one of claims 1 to 4, wherein the refrigerant is combustible refrigerant.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2019021111A JP2020128833A (en) | 2019-02-08 | 2019-02-08 | Heat pump system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3693670A1 true EP3693670A1 (en) | 2020-08-12 |
EP3693670B1 EP3693670B1 (en) | 2024-04-03 |
Family
ID=69500684
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20155785.7A Active EP3693670B1 (en) | 2019-02-08 | 2020-02-06 | Heat pump system |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3693670B1 (en) |
JP (1) | JP2020128833A (en) |
PL (1) | PL3693670T3 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
PL442729A1 (en) * | 2022-11-03 | 2024-05-06 | Krzysztof Januszek | Heat pump |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2023095427A1 (en) * | 2021-11-29 | 2023-06-01 | パナソニックIpマネジメント株式会社 | Heat medium circulation system |
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DE20304068U1 (en) * | 2003-03-14 | 2003-07-24 | August Brötje GmbH, 26180 Rastede | Unit for producing heat for heating purposes and hot water supply has casings of different capacities for useful output boiler and hot water tank similarly constructed and seated one upon the other |
JP2007040661A (en) * | 2005-08-05 | 2007-02-15 | Matsushita Electric Ind Co Ltd | Refrigerator |
EP1906107A1 (en) * | 2005-06-30 | 2008-04-02 | Toshiba Carrier Corporation | Heat pump hotwater supply device |
JP2011122752A (en) | 2009-12-09 | 2011-06-23 | Panasonic Corp | Heat pump water heater |
EP2933580A1 (en) * | 2014-04-11 | 2015-10-21 | Panasonic Intellectual Property Management Co., Ltd. | Hot water generator |
EP3059509A1 (en) * | 2014-12-26 | 2016-08-24 | Mitsubishi Electric Corporation | Outdoor unit |
EP3076100A1 (en) * | 2015-03-31 | 2016-10-05 | Fujitsu General Limited | Ceiling-embedded air conditioner |
EP3260785A1 (en) * | 2015-02-17 | 2017-12-27 | Mitsubishi Electric Corporation | Outdoor unit |
EP3361172A1 (en) * | 2015-10-08 | 2018-08-15 | Mitsubishi Electric Corporation | Indoor unit and air conditioner |
WO2018150253A1 (en) * | 2017-02-14 | 2018-08-23 | Ariston Thermo S.P.A. | New concept heat pump water heater |
-
2019
- 2019-02-08 JP JP2019021111A patent/JP2020128833A/en active Pending
-
2020
- 2020-02-06 EP EP20155785.7A patent/EP3693670B1/en active Active
- 2020-02-06 PL PL20155785.7T patent/PL3693670T3/en unknown
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE20304068U1 (en) * | 2003-03-14 | 2003-07-24 | August Brötje GmbH, 26180 Rastede | Unit for producing heat for heating purposes and hot water supply has casings of different capacities for useful output boiler and hot water tank similarly constructed and seated one upon the other |
EP1906107A1 (en) * | 2005-06-30 | 2008-04-02 | Toshiba Carrier Corporation | Heat pump hotwater supply device |
JP2007040661A (en) * | 2005-08-05 | 2007-02-15 | Matsushita Electric Ind Co Ltd | Refrigerator |
JP2011122752A (en) | 2009-12-09 | 2011-06-23 | Panasonic Corp | Heat pump water heater |
EP2933580A1 (en) * | 2014-04-11 | 2015-10-21 | Panasonic Intellectual Property Management Co., Ltd. | Hot water generator |
EP3059509A1 (en) * | 2014-12-26 | 2016-08-24 | Mitsubishi Electric Corporation | Outdoor unit |
EP3260785A1 (en) * | 2015-02-17 | 2017-12-27 | Mitsubishi Electric Corporation | Outdoor unit |
EP3076100A1 (en) * | 2015-03-31 | 2016-10-05 | Fujitsu General Limited | Ceiling-embedded air conditioner |
EP3361172A1 (en) * | 2015-10-08 | 2018-08-15 | Mitsubishi Electric Corporation | Indoor unit and air conditioner |
WO2018150253A1 (en) * | 2017-02-14 | 2018-08-23 | Ariston Thermo S.P.A. | New concept heat pump water heater |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
PL442729A1 (en) * | 2022-11-03 | 2024-05-06 | Krzysztof Januszek | Heat pump |
WO2024096754A1 (en) * | 2022-11-03 | 2024-05-10 | Krzysztof Januszek | Heat pump |
Also Published As
Publication number | Publication date |
---|---|
PL3693670T3 (en) | 2024-07-29 |
EP3693670B1 (en) | 2024-04-03 |
JP2020128833A (en) | 2020-08-27 |
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