EP1614980A2 - Refrigeration system - Google Patents
Refrigeration system Download PDFInfo
- Publication number
- EP1614980A2 EP1614980A2 EP20050013938 EP05013938A EP1614980A2 EP 1614980 A2 EP1614980 A2 EP 1614980A2 EP 20050013938 EP20050013938 EP 20050013938 EP 05013938 A EP05013938 A EP 05013938A EP 1614980 A2 EP1614980 A2 EP 1614980A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- cold
- hot water
- heat
- heat exchanger
- thermal storage
- 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.)
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Classifications
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- 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
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- 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
- F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
- F25B29/003—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
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- 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
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- 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
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- 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
- F25B2400/22—Refrigeration systems for supermarkets
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- 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
- F25B2400/24—Storage receiver heat
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- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/02—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating liquids, e.g. brine
Definitions
- the present invention relates to a refrigeration system, and particularly to a refrigeration systemhaving a refrigerating cycle for heat source that can be operated with nighttime power.
- the heat generated in the condenser is discharged to the outside during the thermal storage operation under which heat is thermally stored in the ice thermal storage tank, and thus the heat concerned is not effectively used.
- heat pump type hot water supply equipment also generates hot water by using as a heat source the heat generated in a condenser in a refrigerating cycle, and stores the heat of the hot water thus generated in a hot-water stocking tank.
- the heat of the condenser is also discharged to the outside during the hot-water stocking operation, and thus the heat concerned is not effectively used.
- a refrigeration system comprising: a refrigerating cycle for heat source that is operated with nighttime power and generates cold water and hot water; first and second cold/hot water thermal storage device for individually stocking hot water or cold water generated in the refrigerating cycle for heat source; a hot water supply device using the hot water stocked in the first cold/hot water thermal storage device; and an air conditioner using the cold water stocked in the second cold/hot water thermal storage device as a part of a heat source of an air-conditioning refrigerating cycle.
- a refrigerating system comprising: a refrigerating cycle for heat source including a first compressor, a first four-way valve, a first heat exchanger, a first pressure-reducing device and a second heat exchanger that are successively connected through a refrigerant pipe in this order, the first four-way valve being switched so that the first heat exchanger acts as one of a heat-radiating heat source and a heat-absorbing heat source while the second heat exchanger acts as the other heat source; a first cold/hot water thermal storage device that is connected to the first heat exchanger through a water pipe and stocks hot water when the first heat exchanger acts as the heat-radiating heat source or stocks cold water when the first heat exchanger acts as the heat-absorbing heat source; a refrigerating machine that is connected to the first cold/hot water thermal storage device and enables supercooling operation using cold water when the cold water is stocked in the first cold/hot water thermal storage device; a second cold/hot water thermal storage device that
- the air-conditioning refrigerating cycle has a bypass circuit through which refrigerant bypasses the fourth heat exchanger.
- the refrigerating machine comprises a third compressor, a condenser for heat-exchanging with the cold/hot water in the first cold/hot water thermal storage device, a third pressure-reducing device and an evaporator that are connected through a refrigerant pipe in this order.
- the refrigerating cycle for heat source is equipped with an air heat source type sixth heat exchanger between the first heat exchanger and the first pressure-reducing device.
- refrigerant with which a high-pressure side is set to supercritical pressure is filled in the refrigerating cycle for heat source.
- a refrigeration system (refrigeration facilities) 100 mainly comprises a refrigerating cycle 101 for heat source which is operated with nighttime power, a first cold/hot water thermal storage device 102 constituting a so-called hot-water stocking tank, a showcase for a shop or a refrigerating machine 103 such as a large-size refrigerator/freezer 103, a second cold/hot water thermal storage device 104, and an air-conditioning refrigerating cycle 105 for air-conditioning a room to be air-conditioned.
- the refrigerating cycle 101 for heat source is constructed by successively connecting a first compressor 1, a first four-way valve 2, a first heat exchanger 3, a first pressure-reducing device 4 and a second heat exchanger 5 through a refrigerant pipe in this order, and also connecting an auxiliary pressure-reducing device 6 and an air heat source type sixth heat exchanger 7 in series between the first heat exchanger 3 and the first pressure-reducing device 4.
- Reference numeral 8 represents an air blower.
- the first heat exchanger 3 acts as a heat-radiating heat source or heat-absorbing heat source
- the second heat exchanger 5 acts as a heat-absorbing heat source or a heat-radiating heat source.
- the first cold/hot water thermal storage device 102 is connected to the showcase for the shop or the refrigerating machine 103 such as a large-size refrigerator/freezer or the like, and when cold water is stocked in the first cold/hot water thermal storage device 102, the refrigerating machine 103 is designed so that supercooling operation using the cold water concerned can be performed by the refrigerating machine 103 as described later.
- each of the refrigerating machines 103 is constructed by connecting a third compressor 21A, 21B, a condenser 22A, 22B for carrying out heat-exchange with cold/hot water of the hot-water stocking tank 11, a third pressure-reducing device 23A, 23B and an evaporator 24A, 24B through a refrigerant pipe in this order.
- Each condenser 22A, 22B is connected to a water pipe 25 in series, and the water pipe 25 is connected to the feed pipe 13.
- the water pipe 25 is connected between the feed pipe 13 and an electrically-operated three-way valve 26, and the three-way valve 26 is connected to the return pipe 17 between the other three-way valve 18 and the hot-water stocking tank 11.
- Reference numeral 27 represents a pump.
- the second cold/hot water thermal storage device 104 is equipped with a thermal storage tank 31, and water pipes 33 and 34 for circulating water or brine are connected between the thermal storage tank 31 and the second heat exchanger 5, and a pump 35 is connected to the water pipe 34.
- a pump 35 is connected to the water pipe 34.
- the air-conditioning refrigerating cycle 105 is constructed by successively connecting a second compressor 41, a second four-way valve 42, a third heat exchanger 43, a fourth heat exchanger 44 for heat-exchanging with cold/hot water of the thermal storage tank 31, a second pressure-reducing device 45, a fifth heat exchanger 46 for heat-exchanging with indoor air in the room to be air-conditioned and an accumulator 47 in this order. Furthermore, a bypass circuit 48 through which the refrigerant bypasses the fourth heat exchanger 44 is provided, and an opening and closing valve 49 is connected to the bypass circuit 48.
- Reference numeral 50 represents an opening and closing valve
- reference numeral 43A represents an air blower.
- the refrigerating cycle 105 it is possible to carry out supercooling operation or refrigerating heating operation which uses hot water, cold water and/or ice.
- any one of hot water and cold water is stocked in the hot-water stocking tank 11, and any one of hot water and ice (cold water) is stocked in the thermal storage tank 31.
- the state of the refrigerant at the outlet of the compressor 1 is represented by "a".
- the refrigerant is passed through the heat exchanger 3 and circulated, and cooled till the state a of the refrigerant is shifted to a state b while he heat of the refrigerant is radiated to water.
- the refrigerant is cooled till the state b is shifted to a state c as occasion demands.
- the refrigerant is reduced in pressure in the pressure-reducing device 4 so that the state of the refrigerant reaches a state d. Under the state d, two-phase mixture of gas/liquid refrigerant is formed.
- the above construction is provided with a controller 106 for controlling the operation of the first compressor 1 in the refrigerating cycle 101 for heat source, and the controller 106 drives the first compressor 1 in only an operating time zone for nighttime power (for example, 8:00PM - 6:00AM) in which the power consumption charge is generally set to a low value.
- a controller 106 for controlling the operation of the first compressor 1 in the refrigerating cycle 101 for heat source, and the controller 106 drives the first compressor 1 in only an operating time zone for nighttime power (for example, 8:00PM - 6:00AM) in which the power consumption charge is generally set to a low value.
- This thermal storage operation is an operation of stocking hot-water heat in the thermal storage tank 31 and also stocking cold-water heat in the hot-water stocking tank 11 as shown in Fig. 1, and it is carried out by driving the first compressor 1 of the refrigerating cycle 101 for heat source with nighttime power.
- the refrigerant discharged from the first compressor 1 is circulated through the first four-way valve 2, the second heat exchanger 5, the first pressure-reducing device 4 and the first heat exchanger 3, and then it is further passed through the first four-way valve 2 and returned to the first compressor 1 as indicated by a heavy line in Fig. 1.
- the auxiliary pressure-reducing device 6 is fully opened, and the air blower 8 is stopped.
- the opening and closing valve 50 When no hot water exists in the thermal storage tank 31, the opening and closing valve 50 is closed while the opening and closing valve 49 is opened. Under this state, the refrigerant bypasses the fourth heat exchanger 44, and it is passed through the bypass pipe 48 and then circulated through the third heat exchanger 43.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
- Other Air-Conditioning Systems (AREA)
- Air Conditioning Control Device (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
A refrigeration system including a refrigerating cycle for heat source that is operated with nighttime power and generates cold water and hot water, first and second cold/hot water thermal storage device for individually stocking hot water or cold water generated in the refrigerating cycle for heat source, a hot water supply device using the hot water stocked in the first cold/hot water thermal storage device, and an air conditioner using the cold water stocked in the second cold/hot water thermal storage device as a part of a heat source of an air-conditioning refrigerating cycle.
Description
- The present invention relates to a refrigeration system, and particularly to a refrigeration systemhaving a refrigerating cycle for heat source that can be operated with nighttime power.
- There is generally known a refrigeration system in which a compressor, a condenser, a pressure-reducing device and an evaporator are successively connected through a refrigerant pipe in this order to constitute a refrigerating cycle, cold water is generated by using heat in the evaporator of the refrigerating cycle as a heat source, the heat of the cold water thus generated is thermally stored in an ice thermal storage tank, and cooling operation based on thermal storage can be performed by utilizing the cold-water heat thus thermally stored under cooling operation (see JP-A-2002-130770).
- In the conventional refrigeration systemas described above, the heat generated in the condenser is discharged to the outside during the thermal storage operation under which heat is thermally stored in the ice thermal storage tank, and thus the heat concerned is not effectively used.
- Not applied to only the above technique, heat pump type hot water supply equipment also generates hot water by using as a heat source the heat generated in a condenser in a refrigerating cycle, and stores the heat of the hot water thus generated in a hot-water stocking tank. In this case, the heat of the condenser is also discharged to the outside during the hot-water stocking operation, and thus the heat concerned is not effectively used.
- Therefore, the present invention has been implemented to solve the above problem of the related art, and has an object to provide a refrigeration system in which heat loss can be suppressed during the thermal storage operation.
- In order to attain the above object, according to a first aspect of the present invention, there is provided a refrigeration system comprising: a refrigerating cycle for heat source that is operated with nighttime power and generates cold water and hot water; first and second cold/hot water thermal storage device for individually stocking hot water or cold water generated in the refrigerating cycle for heat source; a hot water supply device using the hot water stocked in the first cold/hot water thermal storage device; and an air conditioner using the cold water stocked in the second cold/hot water thermal storage device as a part of a heat source of an air-conditioning refrigerating cycle.
- According to a second aspect of the present invention, there is provided a refrigerating system comprising: a refrigerating cycle for heat source including a first compressor, a first four-way valve, a first heat exchanger, a first pressure-reducing device and a second heat exchanger that are successively connected through a refrigerant pipe in this order, the first four-way valve being switched so that the first heat exchanger acts as one of a heat-radiating heat source and a heat-absorbing heat source while the second heat exchanger acts as the other heat source; a first cold/hot water thermal storage device that is connected to the first heat exchanger through a water pipe and stocks hot water when the first heat exchanger acts as the heat-radiating heat source or stocks cold water when the first heat exchanger acts as the heat-absorbing heat source; a refrigerating machine that is connected to the first cold/hot water thermal storage device and enables supercooling operation using cold water when the cold water is stocked in the first cold/hot water thermal storage device; a second cold/hot water thermal storage device that is connected to the second heat exchanger through a water pipe and stocks hot water when the second heat exchanger acts as the heat-radiating heat source or stocks cold water when the second heat exchanger acts as the heat-absorbing heat source; and an air-conditioning refrigerating cycle that is connected to the second cold/hot water thermal storage device and enables supercooling operation or refrigerant heating operation using the cold/hot water stocked in the second cold/hot water thermal storage device.
- In the above refrigerating system, the air-conditioning refrigerating cycle comprises a second compressor, a second four-way valve, a third heat exchanger, a fourth heat exchanger for heat-exchanging with the cold/hot water in the second cold/hot water thermal storage device, a second pressure-reducing device and a fifth heat exchanger for heat-exchanging with air in a room to be air conditioned that are connected through a refrigerant pipe in this order.
- In the above refrigerating system, the air-conditioning refrigerating cycle has a bypass circuit through which refrigerant bypasses the fourth heat exchanger.
- In the above refrigerating system, the refrigerating machine comprises a third compressor, a condenser for heat-exchanging with the cold/hot water in the first cold/hot water thermal storage device, a third pressure-reducing device and an evaporator that are connected through a refrigerant pipe in this order.
- In the above refrigerating system, the refrigerating cycle for heat source is equipped with an air heat source type sixth heat exchanger between the first heat exchanger and the first pressure-reducing device.
- The above refrigerating system further comprises a controller for operating the refrigerating cycle for heat source with nighttime power.
- In the above refrigerating system, refrigerant with which a high-pressure side is set to supercritical pressure is filled in the refrigerating cycle for heat source.
- According to the present invention, the first cold/hot water thermal storage device and the second cold/hot water thermal storage device which can individually stock therein cold/hot water generated in the refrigerating cycle for heat source. Therefore, when the refrigerating cycle for heat source is operated, both the evaporator and the condenser can be effectively used to generate cold water and hot water, and thus the heat loss under the thermal storage operation can be suppressed.
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- Fig. 1 is a refrigerant circuit diagram showing an embodiment of a refrigeration system according to the present invention;
- Fig. 2 is a refrigerant circuit diagram showing the embodiment of the refrigeration system according to the present invention;
- Fig. 3 is a refrigerant circuit diagram showing the embodiment of the refrigeration system according to the present invention;
- Fig. 4 is a refrigerant circuit diagram showing the embodiment of the refrigeration system according to the present invention; and
- Fig. 5 is a pressure-enthalpy chart.
- A preferred embodiment according to the present invention will be described with reference to the accompanying drawings.
- Fig. 1 is a diagram showing a refrigerant circuit according to an embodiment of the present invention.
- A refrigeration system (refrigeration facilities) 100 mainly comprises a refrigerating
cycle 101 for heat source which is operated with nighttime power, a first cold/hot waterthermal storage device 102 constituting a so-called hot-water stocking tank, a showcase for a shop or a refrigeratingmachine 103 such as a large-size refrigerator/freezer 103, a second cold/hot waterthermal storage device 104, and an air-conditioning refrigeratingcycle 105 for air-conditioning a room to be air-conditioned. - The refrigerating
cycle 101 for heat source is constructed by successively connecting a first compressor 1, a first four-way valve 2, a first heat exchanger 3, a first pressure-reducing device 4 and asecond heat exchanger 5 through a refrigerant pipe in this order, and also connecting an auxiliary pressure-reducingdevice 6 and an air heat source type sixth heat exchanger 7 in series between the first heat exchanger 3 and the first pressure-reducing device 4.Reference numeral 8 represents an air blower. - According to the refrigerating
cycle 101 for heat source, by properly switching the first four-way valve 2, the first heat exchanger 3 acts as a heat-radiating heat source or heat-absorbing heat source, and at the same time thesecond heat exchanger 5 acts as a heat-absorbing heat source or a heat-radiating heat source. - The first cold/hot water
thermal storage device 102 is constructed to contain a hot-water tank 11. Asupply pipe 12 for supplying city water to the hot-water tank 11 and afeed pipe 13 for circulating the water of the hot-water tank 11 to the first heat exchanger 3 are connected to the bottom portion of the hot-water tank 11. Anoutgoing pipe 14 is connected to thefeed pipe 13, and the first heat exchanger 3 is connected to theoutgoing pipe 14 through apump 15. Anincoming pipe 16 is connected to the first heat exchanger 3, and further connected to the upper portion of the hot-water stocking tank 11 through areturn pipe 17. - A hot-
water supply pipe 20 is connected to some midpoint of the hot-water stocking tank 11, and a hot-water supply device such as a bath, a hot water supplier or the like (not shown) is connected to the hot-water supply pipe 20. An electrically-operated three-way valve 18 is connected to theincoming pipe 16, and a so-calledshort cycle pipe 19 is connected between the three-way valve 18 and the upstream point of thepump 15. - The first cold/hot water
thermal storage device 102 is connected to the showcase for the shop or the refrigeratingmachine 103 such as a large-size refrigerator/freezer or the like, and when cold water is stocked in the first cold/hot waterthermal storage device 102, the refrigeratingmachine 103 is designed so that supercooling operation using the cold water concerned can be performed by the refrigeratingmachine 103 as described later. - In this construction, two refrigerating
machines 103 are connected to the first cold/hot waterthermal storage device 102, and each of the refrigeratingmachines 103 is constructed by connecting athird compressor condenser water stocking tank 11, a third pressure-reducingdevice evaporator condenser water pipe 25 in series, and thewater pipe 25 is connected to thefeed pipe 13. Thewater pipe 25 is connected between thefeed pipe 13 and an electrically-operated three-way valve 26, and the three-way valve 26 is connected to thereturn pipe 17 between the other three-way valve 18 and the hot-water stocking tank 11.Reference numeral 27 represents a pump. - The second cold/hot water
thermal storage device 104 is equipped with athermal storage tank 31, andwater pipes thermal storage tank 31 and thesecond heat exchanger 5, and apump 35 is connected to thewater pipe 34. When thesecond heat exchanger 5 acts as a heat-radiating heat source, hot water is stocked in thethermal storage tank 31, and when thesecond heat exchanger 5 acts as a heat-absorbing heat source, cold water (in this case, ice) is stocked in thethermal storage tank 31. - The air-conditioning refrigerating
cycle 105 is constructed by successively connecting asecond compressor 41, a second four-way valve 42, athird heat exchanger 43, afourth heat exchanger 44 for heat-exchanging with cold/hot water of thethermal storage tank 31, a second pressure-reducingdevice 45, afifth heat exchanger 46 for heat-exchanging with indoor air in the room to be air-conditioned and anaccumulator 47 in this order. Furthermore, abypass circuit 48 through which the refrigerant bypasses thefourth heat exchanger 44 is provided, and an opening andclosing valve 49 is connected to thebypass circuit 48.Reference numeral 50 represents an opening and closing valve, andreference numeral 43A represents an air blower. - According to the refrigerating
cycle 105, it is possible to carry out supercooling operation or refrigerating heating operation which uses hot water, cold water and/or ice. In the above construction, any one of hot water and cold water is stocked in the hot-water stocking tank 11, and any one of hot water and ice (cold water) is stocked in thethermal storage tank 31. - In the above construction, refrigerant with which the high pressure side is set to supercritical pressure under operation, for example, carbon dioxide (CO2) is filled in the refrigerating
cycle 101 for heat source. In a case where CO2 refrigerant is filled, the inside of the high-pressure circuit is operated under supercritical pressure during operation as shown in a pressure-enthalpy chart of Fig. 5 in accordance with a specific condition such as a case where the outside air temperature increases to 30°C or more in summer season or a load is increased. Not only CO2 refrigerant, but also ethylene, diborane, ethane, nitrogen oxide or the like may be used as refrigerant with which the inside of the high pressure circuit is operated under supercritical pressure. - In Fig. 5, the state of the refrigerant at the outlet of the compressor 1 is represented by "a". The refrigerant is passed through the heat exchanger 3 and circulated, and cooled till the state a of the refrigerant is shifted to a state b while he heat of the refrigerant is radiated to water. The refrigerant is cooled till the state b is shifted to a state c as occasion demands. Subsequently, the refrigerant is reduced in pressure in the pressure-reducing device 4 so that the state of the refrigerant reaches a state d. Under the state d, two-phase mixture of gas/liquid refrigerant is formed. In the
heat exchanger 5, the liquid-phase refrigerant of the gas/liquid refrigerant is evaporated while absorbing heat. A state e is an intermediate state of theheat exchanger 5, and the gas-phase refrigerant of the gas/liquid refrigerant is heated till the state of the refrigerant is shifted to a state f and then fed to the suction pipe of the compressor 1. - In this construction, the high-pressure single-phase gas refrigerant discharged from the compressor 1 is not condensed, but reduced in temperature in the heat exchanger 3, so that the refrigerant is cooled till the state thereof is shifted to the state c under which the temperature of the refrigerant is lower than the temperature of water by several degrees. As a result, the water temperature is increased to about 80°C or more.
- Furthermore, the above construction is provided with a
controller 106 for controlling the operation of the first compressor 1 in the refrigeratingcycle 101 for heat source, and thecontroller 106 drives the first compressor 1 in only an operating time zone for nighttime power (for example, 8:00PM - 6:00AM) in which the power consumption charge is generally set to a low value. - Next, the operation of this embodiment will be described.
- This thermal storage operation is an operation of stocking hot-water heat in the
thermal storage tank 31 and also stocking cold-water heat in the hot-water stocking tank 11 as shown in Fig. 1, and it is carried out by driving the first compressor 1 of the refrigeratingcycle 101 for heat source with nighttime power. During this operation, in the refrigeratingcycle 101 for heat source, the refrigerant discharged from the first compressor 1 is circulated through the first four-way valve 2, thesecond heat exchanger 5, the first pressure-reducing device 4 and the first heat exchanger 3, and then it is further passed through the first four-way valve 2 and returned to the first compressor 1 as indicated by a heavy line in Fig. 1. The auxiliary pressure-reducingdevice 6 is fully opened, and theair blower 8 is stopped. In thesecond heat exchanger 5, heat is radiated and hot water is generated by utilizing the heat thus radiated. That is, in the second cold/hot waterthermal storage device 104, thepump 35 is driven, and water or brine is circulated through thewater pipes second heat exchanger 5 and thethermal storage tank 31, so that the hot-water heat is stocked in thethermal storage tank 31. Furthermore, in the first heat exchanger 3, heat is absorbed and cold water is generated by utilizing the heat absorption concerned. In this case, in the cold/hot waterthermal storage device 102, thepump 15 is driven, and city water in the hot-water stocking tank 11 is circulated through thewater pipes water stocking tank 11, so that cold-water heat is stocked in the hotwater stocking tank 11. - If the thermal storage into the
thermal storage tank 31 is not required in the above operation, the air heat source type sixth heat exchanger 7 is functioned in place of thesecond heat exchanger 5. Furthermore, if the thermal storage into the hotwater stocking tank 11 is not required, the driving of thepump 15 is stopped, theair blower 8 is driven, and the air heat source type sixth heat exchanger 7 is functioned in place of the first heat exchanger 3. - This heating operation is a heating operation using the hot-water heat of the
thermal storage tank 31 as shown in Fig. 2. In this case, in the air-conditioning refrigerating cycle 105, the refrigerant discharged from thesecond compressor 41 is circulated through the second four-way valve 42, thefifth heat exchanger 46, the second pressure-reducingdevice 45, thefourth heat exchanger 44 and thethird heat exchanger 43, and then it is passed through the four-way valve 42 and then returned to thesecond compressor 41 as indicated by a heavy line. Under this state, the refrigerant is heated with hot water in thefourth heat exchanger 44 and thus the heating efficiency is more enhanced as compared with general air conditioners. - Furthermore, it is possible to carry out an effective defrosting operation of the
third heat exchanger 43 at a low outside air temperature by using this hot-water heat, and the continuous operation of the air-conditioning refrigerating cycle 105 concerned can be performed. - When no hot water exists in the
thermal storage tank 31, the opening and closingvalve 50 is closed while the opening and closingvalve 49 is opened. Under this state, the refrigerant bypasses thefourth heat exchanger 44, and it is passed through thebypass pipe 48 and then circulated through thethird heat exchanger 43. - As indicated by a heavy line of Fig. 2, this refrigerating operation is an operation using the cold-water heat of the hot-
water stocking tank 11 during the operation of the refrigeratingmachine 103. During this refrigerating operation, in the refrigeratingmachine 103, the refrigerant discharged from thethird compressors condensers devices evaporators third compressors pump 27 is driven, and the cold water in the hot-water stocking tank 11 is circulated through thecondensers way valve 26 and then returned to the hot-water stocking tank 11. In this operation, the refrigerant in the refrigeratingmachine 103 side is supercooled by the cold water circulated through thecondensers machine 103 is enhanced. Accordingly, the daytime power peak in summer season in which the power consumption amount is increased can be reduced. - As shown in Fig. 3, this thermal storage operation is an operation of stocking cold-water heat (ice) in the
thermal storage tank 31 and also stocking hot-water heat in the hot-waterheat stocking tank 11, and it is carried out by driving the first compressor 1 of the refrigeratingcycle 101 for heat source with nighttime power. Under this operation, the refrigerant discharged from the first compressor 1 is first circulated through the first four-way valve 2, the first heat exchanger 3, the first pressure-reducing device 4 and thesecond heat exchanger 5 in the refrigeratingcycle 101 for heat source, and then it is passed through the first four-way valve 2 and returned to the first compressor 1 as indicated by a heavy line in Fig. 3. The auxiliary pressure-reducingdevice 6 is fully opened, and theair blower 8 is stopped. In the first heat exchanger 3, heat is radiated, and hot water is generated by using the radiated heat. That is, in the first cold/hot waterthermal storage device 102, thepump 15 is driven, city water in the hot-water stocking tank 11 is circulated through thewater pipes water stocking tank 11, and the hot-water heat is stocked in the hot-water stocking tank 11. Furthermore, in thesecond heat exchanger 5, heat is absorbed, and cold water is generated by using this absorbed heat. In this case, in the second cold/hot waterthermal storage device 104, thepump 35 is driven, and water or brine is circulated through thewater pipes exchanger 5 and thethermal storage tank 31 and the cold-water heat (ice) is stocked in thethermal storage tank 31. - In this operation, if the thermal storage into the
thermal storage tank 31 is not required, the operation of thepump 35 is stopped, the air blower is operated and the air heat source type sixth heat exchanger 7 is functioned in place of thesecond heat exchanger 5. As a result, the hot water can be stored in the hot-water stocking tank 11 by using the air heat source. Furthermore, if the thermal storage into the hot-water stocking tank 11 is not required, the operation of thepump 15 is stopped, theair blower 8 is operated and the air heat source type sixth heat exchanger 7 is functioned in place of the first heat exchanger 3. - As shown in Fig. 4, this cooling operation is an operation using cold-water heat (ice) of the
thermal storage tank 31. In this case, in the air-conditioning refrigerating cycle 105, the refrigerant discharged from thesecond compressor 41 is circulated through the second four-way valve 42, thethird heat exchanger 43, thefourth heat exchanger 44, the second pressure-reducingdevice 45 and thefifth heat exchanger 46, and thereafter it is passed through the second four-way valve 42 and theaccumulator 47 and then returned to thesecond compressor 41 as indicated by a heavy line in Fig. 4. Under this state, the refrigerant is supercooled by the cold water in thefourth heat exchanger 44, and thus the cooling efficiency is more enhanced as compared with general air conditioners. - When no cold water (ice) is thermally stored in the
thermal storage tank 31, if the refrigerating system is operated under the state that the opening and closingvalve 50 is closed and the opening and closingvalve 49 is opened, the refrigerant bypasses thefourth heat exchanger 44 and passes through thebypass pipe 48 to the second pressure-reducingdevice 45, so that cooling operation using no cold water (ice) can be performed and thus continuous cooling operation covering the daytime and the nighttime can be performed. - As indicated by a heavy line of Fig. 4, the hot-
water supply pipe 20 is connected to the hot-water stocking tank 11, and a hot water supplying device such as a bath, a hot water supplier or the like (not shown) is connected to the hot-water supply pipe 20. Accordingly, in this construction, the hot water in the hotwater stocking tank 11 can be supplied to the hot water supplying device while the cooling operation using the cold water described above is carried out. - The present invention is not limited to the above embodiment, and various modifications may be made without departing from the subject matter of the present invention. For example, in the above construction, CO2 refrigerant is filled in the refrigerant circuit, however, the refrigerant is not limited to CO2 refrigerant, and Freon-based refrigerant may be filled.
Claims (8)
- A refrigeration system comprising:a refrigerating cycle for heat source that is operated with nighttime power and generates cold water and hot water;first and second cold/hot water thermal storage device for individually stocking hot water or cold water generated in the refrigerating cycle for heat source;a hot water supply device using the hot water stocked in the first cold/hot water thermal storage device; andan air conditioner using the cold water stocked in the second cold/hot water thermal storage device as a part of a heat source of an air-conditioning refrigerating cycle.
- A refrigerating system comprising:a refrigerating cycle for heat source including a first compressor, a first four-way valve, a first heat exchanger, a first pressure-reducing device and a second heat exchanger that are successively connected through a refrigerant pipe in this order, the first four-way valve being switched so that the first heat exchanger acts as one of a heat-radiating heat source and a heat-absorbing heat source while the second heat exchanger acts as the other heat source;a first cold/hot water thermal storage device that is connected to the first heat exchanger through a water pipe and stocks hot water when the first heat exchanger acts as the heat-radiating heat source or stocks cold water when the first heat exchanger acts as the heat-absorbing heat source;a refrigerating machine that is connected to the first cold/hot water thermal storage device and enables supercooling operation using cold water when the cold water is stocked in the first cold/hot water thermal storage device;a second cold/hot water thermal storage device that is connected to the second heat exchanger through a water pipe and stocks hot water when the second heat exchanger acts as the heat-radiating heat source or stocks cold water when the second heat exchanger acts as the heat-absorbing heat source; andan air-conditioning refrigerating cycle that is connected to the second cold/hot water thermal storage device and enables supercooling operation or refrigerant heating operation using the cold/hot water stocked in the second cold/hot water thermal storage device.
- The refrigerating system according to claim 2, wherein the air-conditioning refrigerating cycle comprises a second compressor, a second four-way valve, a third heat exchanger, a fourth heat exchanger for heat-exchanging with the cold/hot water in the second cold/hot water thermal storage device, a second pressure-reducing device and a fifth heat exchanger for heat-exchanging with air in a room to be air conditioned that are connected through a refrigerant pipe in this order.
- The refrigerating system according to claim 3, wherein the air-conditioning refrigerating cycle has a bypass circuit through which refrigerant bypasses the fourth heat exchanger.
- The refrigerating system according to claim 2, wherein the refrigerating machine comprises a third compressor, a condenser for heat-exchanging with the cold/hot water in the first cold/hot water thermal storage device, a third pressure-reducing device and an evaporator that are connected through a refrigerant pipe in this order.
- The refrigerating system according to claim 2, wherein the refrigerating cycle for heat source is equipped with an air heat source type sixth heat exchanger between the first heat exchanger and the first pressure-reducing device.
- The refrigerating system according to claim 2, further comprising a controller for operating the refrigerating cycle for heat source with nighttime power.
- The refrigerating system according to claim 2, wherein refrigerant with which a high-pressure side is set to supercritical pressure is filled in the refrigerating cycle for heat source.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004201001A JP2006023006A (en) | 2004-07-07 | 2004-07-07 | Refrigeration facility |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1614980A2 true EP1614980A2 (en) | 2006-01-11 |
Family
ID=35241062
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20050013938 Withdrawn EP1614980A2 (en) | 2004-07-07 | 2005-06-28 | Refrigeration system |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1614980A2 (en) |
JP (1) | JP2006023006A (en) |
CN (1) | CN100419349C (en) |
Cited By (8)
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ITMI20090331A1 (en) * | 2009-03-06 | 2010-09-07 | Ecold S N C Di Colferai Roberta & C | THERMAL SYSTEM PARTICULARLY FOR POINTS OF SALE OF FOODSTUFFS LIKE SUPERMARKETS AND SIMILAR. |
NL2003113C2 (en) * | 2009-07-01 | 2011-01-04 | Hoogvliet B V | HEAT RECOVERY UNIT, UTILITY BUILDING WITH HEAT RECOVERY UNIT, METHOD FOR RECOVERING HEAT, USE OF A HEAT PUMP. |
CN101504210B (en) * | 2009-03-17 | 2011-07-20 | 贝莱特空调有限公司 | Six-in-one air-cooling heat pump unit |
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CN106765916A (en) * | 2016-12-07 | 2017-05-31 | 郑喜勋 | Temperature control system and temprature control method |
US9765977B2 (en) | 2009-09-29 | 2017-09-19 | Mitsubishi Electric Corporation | Heat-accumulating hot-water-supplying air conditioner |
CN107655126A (en) * | 2017-11-01 | 2018-02-02 | 江苏高菱蓄能科技有限公司 | A kind of full-effective water cold accumulation system |
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JP2008241203A (en) * | 2007-03-28 | 2008-10-09 | Toshiba Carrier Corp | Heat pump air-conditioning and heating water heater |
JP5585003B2 (en) * | 2009-05-27 | 2014-09-10 | 三洋電機株式会社 | Refrigeration equipment |
JP5327308B2 (en) * | 2011-09-30 | 2013-10-30 | ダイキン工業株式会社 | Hot water supply air conditioning system |
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JP2000179970A (en) * | 1998-12-11 | 2000-06-30 | Sanyo Electric Co Ltd | Air conditioning system |
JP2002081815A (en) * | 2000-09-07 | 2002-03-22 | Sanyo Electric Co Ltd | Duct type cold storage system |
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JP4062663B2 (en) * | 2001-12-25 | 2008-03-19 | 清水建設株式会社 | Production system for supercooled water and hot water |
-
2004
- 2004-07-07 JP JP2004201001A patent/JP2006023006A/en not_active Withdrawn
-
2005
- 2005-04-05 CN CNB2005100628933A patent/CN100419349C/en not_active Expired - Fee Related
- 2005-06-28 EP EP20050013938 patent/EP1614980A2/en not_active Withdrawn
Cited By (9)
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EP2213962A3 (en) * | 2009-01-28 | 2014-12-03 | SANYO Electric Co., Ltd. | Refrigerating apparatus |
ITMI20090331A1 (en) * | 2009-03-06 | 2010-09-07 | Ecold S N C Di Colferai Roberta & C | THERMAL SYSTEM PARTICULARLY FOR POINTS OF SALE OF FOODSTUFFS LIKE SUPERMARKETS AND SIMILAR. |
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Also Published As
Publication number | Publication date |
---|---|
CN100419349C (en) | 2008-09-17 |
JP2006023006A (en) | 2006-01-26 |
CN1719159A (en) | 2006-01-11 |
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