US20170356681A1 - Refrigeration and heating system - Google Patents
Refrigeration and heating system Download PDFInfo
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- US20170356681A1 US20170356681A1 US15/537,683 US201415537683A US2017356681A1 US 20170356681 A1 US20170356681 A1 US 20170356681A1 US 201415537683 A US201415537683 A US 201415537683A US 2017356681 A1 US2017356681 A1 US 2017356681A1
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- refrigeration
- heating
- refrigerant
- heat exchanger
- heating 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
- 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
- F25B40/00—Subcoolers, desuperheaters or superheaters
- F25B40/04—Desuperheaters
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- F25B41/04—
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/027—Condenser control arrangements
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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
- F25B2339/00—Details of evaporators; Details of condensers
- F25B2339/04—Details of condensers
- F25B2339/047—Water-cooled condensers
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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
- F25B2400/04—Refrigeration circuit bypassing means
- F25B2400/0403—Refrigeration circuit bypassing means for the condenser
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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
- F25B2400/04—Refrigeration circuit bypassing means
- F25B2400/0405—Refrigeration circuit bypassing means for the desuperheater
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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
- F25B2400/05—Compression system with heat exchange between particular parts of the system
- F25B2400/053—Compression system with heat exchange between particular parts of the system between the storage receiver and another part of the 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
- 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
- F25B2400/07—Details of compressors or related parts
- F25B2400/075—Details of compressors or related parts with parallel compressors
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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
- F25B2400/13—Economisers
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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
- F25B2400/23—Separators
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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
- F25B2600/00—Control issues
- F25B2600/07—Remote controls
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/191—Pressures near an expansion valve
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2116—Temperatures of a condenser
- F25B2700/21162—Temperatures of a condenser of the refrigerant at the inlet of the condenser
Definitions
- the heat provided by the refrigeration process may not be sufficient to meet the heating demands.
- a refrigeration and heating system comprises a refrigeration circuit and a heating circuit, which are coupled by a coupling heat exchanger configured for transferring heat from a refrigerant circulating within the refrigeration circuit to a heating fluid circulating within the heating circuit.
- the refrigeration circuit comprises in the direction of flow of the circulating refrigerant: at least one compressor; a refrigeration circuit side of a coupling heat exchanger; at least one gas cooler; at least one expansion device; and at least one evaporator.
- the heating circuit comprises: a heating circuit side of the coupling heat exchanger; at least one heat consumer; and at least one controllable heating fluid bypass valve, which allows at least a portion of the heating fluid to flow directly from an outlet to an inlet of the heating circuit side of the coupling heat exchanger bypassing the at least one heat consumer.
- the refrigeration and heating system further comprises a control unit, which is configured for selectively opening the at least one heating fluid bypass valve in order to meet increased heating demands.
- a refrigeration and heating system comprises a refrigeration circuit and a heating circuit, which are coupled by a coupling heat exchanger configured for transferring heat from a refrigerant circulating within the refrigeration circuit to a heating fluid circulating within the heating circuit.
- the refrigeration circuit comprises in the direction of flow of the circulating refrigerant: at least one compressor, a heat exchanger bypass valve, which is provided as an adjustable mixing valve, a refrigeration circuit side of a coupling heat exchanger, at least one gas cooler, at least one expansion device and at least one evaporator.
- the heating circuit comprises a heating circuit side of the coupling heat exchanger and at least one heat consumer.
- the coupling heat exchanger is configured for transferring heat from the refrigerant flowing through the refrigeration circuit side to the heating fluid flowing through the heating circuit side.
- the refrigeration and heating system further comprises a control unit, which is configured for selectively controlling the heat exchanger bypass valve for allowing at least a portion of the refrigerant to bypass the refrigeration circuit side of a coupling heat exchanger for increasing the temperature of the refrigerant upstream the gas cooler in order to meet increased heating demands.
- the refrigeration process is made less efficient by increasing the temperature of the refrigerant circulating within the refrigeration circuit. This can be achieved either by delivering a portion of the heating fluid leaving the coupling heat exchanger directly back into the coupling heat exchanger by means of a heating fluid bypass valve connected between then outlet side and the inlet side of the coupling heat exchanger's heating circuit side or by allowing at least a portion of the refrigerant circulating within the refrigeration circuit to bypass the coupling heat exchanger.
- the temperature of the refrigerant within the refrigeration circuit is increased, enhanced operation of the compressor(s) is needed in order to meet the required cooling demands. This results in more thermal heat, which may be used for heating purposes, being created without increasing the cooling capacity.
- the thermal heat can be regulated without capacity stages.
- the additional heat generated by the compressor(s) can either be used for reducing the size of an external (e.g. electrical) heat source, which is used in state of the art systems in order to meet high heating demands, or even make an external heating source obsolete. As existing equipment can be used with only minor modifications, the implementation costs are low.
- FIG. 1 shows a refrigeration and heating system 2 a according to a first exemplary embodiment of the invention
- FIG. 2 shows a refrigeration and heating system 2 b according to a second exemplary embodiment of the invention.
- FIG. 1 shows a schematic view of a refrigeration and heating system 2 a according to a first exemplary embodiment of the invention.
- the refrigeration and heating system 2 a comprises a refrigeration circuit 4 and a heating circuit 20 thermally coupled with each other by a coupling heat exchanger 8 , which is configured for transferring heat from the refrigeration circuit 4 to the heating circuit 20 .
- the refrigeration circuit 4 in particular comprises in the direction of flow of a circulating refrigerant: a plurality of compressors 6 a , 6 b , 6 c fluidly connected in parallel for compressing and circulating a fluid refrigerant through the refrigeration circuit 4 ; a coupling heat exchanger bypass valve 34 allowing to selectively direct the flow of refrigerant leaving the compressors 6 a , 6 b , 6 c either to a refrigeration circuit side 8 a of a coupling heat exchanger 8 , which couples the refrigeration circuit 4 to the heating circuit 20 , or to bypass said coupling heat exchanger 8 in order to direct the flow of refrigerant leaving the plurality of compressors 6 a , 6 b , 6 c directly to the inlet side 10 a of at least one gas cooler 10 , which is fluidly connected to the outlet side of the coupling heat exchanger 8 .
- the outlet side 10 b of the at least one gas cooler 10 is connected via a gas cooler bypass valve 24 , which will be described in more detail further below, to the inlet side of a high pressure control device 12 , which is configured for expanding the refrigerant from the high pressure generated by the compressors 6 a , 6 b , 6 c to a lower medium pressure, before it enters into a receiver 26 , which is configured for separating gas phase refrigerant collecting at the top of the receiver 26 from liquid refrigerant, collecting at the bottom of the receiver 26 .
- the bottom of the receiver is fluidly connected to a medium pressure expansion device 14 and an evaporator 16 fluidly connected downstream of the medium pressure expansion device 14 for evaporating the expanded refrigerant thereby absorbing heat from the environment and providing the desired cooling capacity.
- the outlet side of the evaporator 16 is fluidly connected to the inlet lines 7 a , 7 b , 7 c of the compressors 6 a , 6 b , 6 c closing the refrigeration cycle.
- the compressors 6 a , 6 b , 6 c may be individually switched on and off allowing to vary their combined performance.
- at least one of the compressors 6 a , 6 b , 6 c may be provided as a variable speed compressor 6 a allowing to continuously vary its performance in order to adjust the capacity provided by the compressors 6 a , 6 b , 6 c even more precisely.
- a flash gas line 28 comprising a flash gas valve 30 and an optional heat exchanger 32 , which is configured for allowing heat exchange between the flash gas flowing through the flash gas line 28 and the liquid refrigerant leaving the bottom of the receiver 26 , fluidly connects an upper portion of the receiver 26 to inlet lines 7 a , 7 b , 7 c of the compressors 6 a , 6 b , 6 c allowing, by controlling the flash gas valve 30 , flash gas to selectively exit from the top of the receiver and to flow to the inlet side of the compressors 6 a , 6 b , 6 c .
- Selectively delivering flash gas from the receiver 26 to the inlet lines 7 a , 7 b , 7 c of the compressors 6 a , 6 b , 6 c allows to adjust the pressure with the receiver 26 .
- An optional gas cooler bypass line 18 which connects between the inlet side 10 a of the gas cooler 10 and the gas cooler bypass valve 24 arranged between the outlet side 10 b of the gas cooler 10 and the high pressure control device 12 , allows to selectively bypass the gas cooler 10 by opening the gas cooler bypass valve 24 in case so much heat is transferred from the refrigerant circuit 4 to the heating circuit 20 by means of the coupling heat exchanger 8 that no further cooling of the circulating refrigerant is necessary.
- the heating circuit 20 comprises in the direction of flow of a circulating heating fluid a heating circuit side 8 b of the coupling heat exchanger 8 and at least one heat consumer 22 for consuming the transferred heat, e.g. for heating water and/or (parts of) a building.
- the coupling heat exchanger 8 is in thermal connection with the refrigerant circuit side 8 a of the coupling heat exchanger 8 allowing heat to transfer from the refrigerant circulating within refrigeration circuit 4 and flowing through the refrigeration circuit side 8 a of the coupling heat exchanger 8 to the heating fluid circulating within the heating circuit 20 and flowing through the heating circuit side 8 b of the coupling heat exchanger 8 .
- At least one heating fluid pump 36 may be provided for supporting the circulation of the heating fluid through the heating circuit 20 .
- At least one heating fluid bypass valve 23 is connected in parallel to the at least one heat consumer 22 allowing to partially bypass said at least one heat consumer 22 by at least partially opening the at least one heating fluid bypass valve 23 for allowing fluid to flow from the outlet side of the coupling heat exchanger's 8 heating circuit side 8 b of the coupling heat exchanger 8 to the inlet side of said heating circuit side 8 b of the coupling heat exchanger 8 without being cooled by delivering heat to the at least one heat consumer 22 .
- the temperature within the coupling heat exchanger 8 will increase and the temperature of the refrigerant leaving the refrigeration circuit side 8 a of the coupling heat exchanger 8 will increase, as well.
- the increased temperature of the refrigerant will result in more flash gas being produced downstream of the high pressure control device 12 , and as a result, the refrigeration circuit 4 will operate with less efficiency.
- the performance of the compressors 6 a , 6 b , 6 c has to be increased, e.g. by switching on additional compressors 6 a , 6 b , 6 c or increasing the rotational speed of an adjustable compressor 6 a , 6 b , 6 c .
- An increased operation of the compressors 6 a , 6 b , 6 c will add more thermal energy into the refrigeration and heating system 2 a , which is used for providing the desired heat at the heat consumer(s) 22 .
- the refrigeration and heating system 2 a further comprises a control unit 38 for controlling the compressors 6 a , 6 b , 6 c , the switchable valves 12 , 24 , 30 , 34 of the refrigeration circuit 4 and in particular the heating fluid bypass valve 23 in order to provide the desired cooling and heating capacities.
- the control unit 38 may control the compressors 6 a , 6 b , 6 c and valves 12 , 23 , 24 , 30 , 34 by means of electrical wires, which are not shown in the figure for reasons of clarity, or by means of wireless connections (WLAN; Bluetooth etc.).
- At least one of a refrigerant pressure sensor 40 , a refrigerant temperature sensor 42 , a heating fluid temperature sensor 44 and an ambient air temperature sensor 46 may be provided, allowing the control unit 38 to control the compressors 6 a , 6 b , 6 c and valves 12 , 23 , 24 , 30 , 34 based on the temperatures and/or pressures measured by said sensor(s) 40 , 42 , 44 , 46 .
- a refrigerant pressure sensor 40 may in particular be located upstream the high pressure control valve 12 .
- FIG. 2 shows a schematic view of a refrigeration and heating system 2 b according to a second exemplary embodiment of the invention.
- the heat exchanger bypass valve 34 is provided as an adjustable mixing valve 34 , which may be controlled by the control unit 38 to selectively allow a portion of the refrigerant to bypass the coupling heat exchanger 8 in order to increase the temperature of the refrigerant upstream the gas cooler 10 .
- the heating fluid bypass valve 23 As the temperature of the refrigerant may be regulated by means of the heat exchanger bypass valve 34 , the heating fluid bypass valve 23 , which has been described in the context of the first embodiment, is optional and may be omitted in the refrigeration and heating system 2 b according to the second embodiment.
- a flash gas compressor line 29 fluidly connects between an upper portion of the receiver 26 and the inlet side 7 d of an additional flash gas compressor (economizer compressor) 6 d .
- the output side of said flash gas compressor 6 d is connected with the outputs sides of the other compressors 6 a , 6 b , 6 c .
- Providing a separate flash gas compressor 6 d allows for an efficient compression of the flash gas delivered from the refrigerant receiver 26 .
- a flash gas compressor 6 d and the flash gas compressor line 29 as shown in FIG. 2 may by employed in the first embodiment comprising a heating fluid bypass valve 23 instead of an adjustable head exchanger bypass valve 34 , as well.
- the flash gas compressor 6 d and the flash gas compressor line 29 may be employed alternatively or in addition to the flash gas line 28 comprising the flash gas valve 30 as shown in FIG. 1 .
- bypass valve is a continuously adjustable valve allowing to selectively adjust the flow of heating fluid bypassing the heat consumer(s) with high accuracy.
- the refrigeration circuit comprises a gas cooler bypass line and a gas cooler bypass valve allowing refrigerant to selectively bypass the gas cooler(s) in case the temperature of the refrigerant leaving the coupling heat exchanger is low enough so that no further cooling of the refrigerant is necessary.
- a refrigerant receiver is provided downstream of the gas cooler for separating gas phase refrigerant from liquid phase refrigerant and storing said refrigerant.
- a high pressure control device is provided upstream of the refrigerant receiver in order to expand the refrigerant leaving the gas cooler before entering the receiver.
- a flash gas line fluidly connects between an upper portion of the refrigerant receiver and an inlet line of the at least one compressor for allowing flash gas, which collects at the top of the receiver, to flow from the receiver directly to the inlet side of the compressor(s) bypassing the medium expansion device(s) and the evaporator(s).
- a flash gas valve provided in the flash gas line allows to control and regulate the flow of flash gas through the flash gas line and to adjust the pressure within the receiver.
- a flash gas compressor line may fluidly connect the upper portion of the refrigerant receiver with an inlet line of an additional flash gas compressor.
- an additional flash gas heat exchanger allows heat exchange between the flash gas flowing through the flash gas line and refrigerant leaving from the bottom of the receiver. This heat exchange may improve the efficiency of the refrigeration circuit even further.
- control unit for controlling the at least one compressor, the heating fluid bypass valve and/or the gas cooler bypass valve comprises a microcomputer which is configured for running an appropriate program controlling the operation of the combined refrigeration and heating system.
- the refrigeration and heating system further comprises at least one of a refrigerant pressure sensor, a refrigerant temperature sensor, a heating fluid temperature sensor and/or an ambient air temperature sensor functionally connected to the control unit for allowing the control unit to control the compressors, the heating fluid bypass valve and/or the gas cooler bypass valve based on the measured temperatures and/or pressures in order to optimally adjust the operation of the refrigeration and heating system.
- the refrigerant comprises carbon dioxide, which provides an efficient, inflammable, non-toxic and environmentally acceptable refrigerant, which partly operates in transcritical conditions.
- the heating fluid in particular may include water, which may in particular comprise an anti-corrosive additive.
- the method of operating a refrigeration and heating system includes the step of controlling a controllable valve, which is connected between the outlet and the inlet of the heating circuit side of the coupling heat exchanger, for selectively allowing a portion of the heating fluid to flow directly from an outlet to an inlet of the heating circuit side of the coupling heat exchanger bypassing the at least one heat consumer.
- the method of operating a refrigeration and heating system includes the step of controlling an adjustable heat exchanger bypass valve for selectively allowing a portion of the heating fluid to bypass the coupling heat exchanger in order to increase the temperature of the refrigerant circulating within the refrigeration circuit.
- the method may further include measuring the temperature of the refrigerant circulating within the refrigeration circuit and/or the temperature of the heating fluid circulating within the heating circuit and controlling the controllable valve, the adjustable heat exchanger bypass valve and/or the at least one compressor based on the measured temperature of the circulating refrigerant and/or the measured temperature of the heating fluid, respectively, in order to set an optimal operating point of the refrigeration circuit.
- the method may further include measuring the pressure of the refrigerant circulating within the refrigeration circuit, in particular upstream the high pressure control valve and controlling the controllable bypass valve, the adjustable heat exchanger bypass valve and/or the at least one compressor based on the measured pressure in order to set the optimal point of operation of the refrigeration circuit.
- the method may further comprise measuring the ambient temperature and controlling the controllable valve based on the measured ambient temperature and/or determining the heating and/or cooling demands and controlling the controllable valve, the adjustable heat exchanger bypass valve and/or the at least one compressor based on said demands.
- the method may also include to determine the heating and/or cooling demands and controlling the controllable valve, the adjustable heat exchanger bypass valve and/or the at least one compressor based on said demands.
Abstract
Description
- In order to increase the efficiency of a refrigeration system by recovering the heat rejected by the refrigeration system combined refrigeration and heating systems are provided in which the heat generated by the refrigeration system is not rejected as waste heat to the environment but delivered to a heating system to be used for heating a building and/or service water etc.
- At low ambient temperatures, e.g. in winter, only a comparatively low cooling capacity is needed. As a result, the compressor(s) of the refrigeration system will run only in part load providing only a comparatively low heating capacity. Full load with all compressors running at full speed, which causes the system's heating capacity to be at its maximum, will take place only rarely, namely during the hottest days of summer, when usually only a reduced amount of heat is needed.
- As in case of low ambient temperatures, less cooling capacity but increased heating capacity is needed, the heat provided by the refrigeration process may not be sufficient to meet the heating demands.
- It therefore would be beneficial to provide an improved combined refrigeration and heating system and a method of operating such a system allowing to meet increased heating demands even when less cooling capacity is needed.
- A refrigeration and heating system according to an exemplary embodiment of the invention comprises a refrigeration circuit and a heating circuit, which are coupled by a coupling heat exchanger configured for transferring heat from a refrigerant circulating within the refrigeration circuit to a heating fluid circulating within the heating circuit. The refrigeration circuit comprises in the direction of flow of the circulating refrigerant: at least one compressor; a refrigeration circuit side of a coupling heat exchanger; at least one gas cooler; at least one expansion device; and at least one evaporator. The heating circuit comprises: a heating circuit side of the coupling heat exchanger; at least one heat consumer; and at feast one controllable heating fluid bypass valve, which allows at least a portion of the heating fluid to flow directly from an outlet to an inlet of the heating circuit side of the coupling heat exchanger bypassing the at least one heat consumer. The refrigeration and heating system further comprises a control unit, which is configured for selectively opening the at least one heating fluid bypass valve in order to meet increased heating demands.
- A method of operating a refrigeration and heating system according to an exemplary embodiment of the invention comprises the steps of
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- circulating a refrigerant through a refrigeration circuit;
- circulating a heating fluid through a heating circuit; the heating circuit and the refrigeration circuit being thermally coupled by means of a coupling heat exchanger allowing heat to transfer from the refrigeration circuit to the heating circuit; and
- increasing the temperature of the refrigerant leaving the coupling heat exchanger by allowing at least a portion of the heating fluid to flow directly from an outlet to an inlet of the heating circuit side of the coupling heat exchanger bypassing the at least one heat consumer in order to meet increased heating demands.
- A refrigeration and heating system according to another exemplary embodiment of the invention comprises a refrigeration circuit and a heating circuit, which are coupled by a coupling heat exchanger configured for transferring heat from a refrigerant circulating within the refrigeration circuit to a heating fluid circulating within the heating circuit. The refrigeration circuit comprises in the direction of flow of the circulating refrigerant: at least one compressor, a heat exchanger bypass valve, which is provided as an adjustable mixing valve, a refrigeration circuit side of a coupling heat exchanger, at least one gas cooler, at least one expansion device and at least one evaporator. The heating circuit comprises a heating circuit side of the coupling heat exchanger and at least one heat consumer. The coupling heat exchanger is configured for transferring heat from the refrigerant flowing through the refrigeration circuit side to the heating fluid flowing through the heating circuit side. The refrigeration and heating system further comprises a control unit, which is configured for selectively controlling the heat exchanger bypass valve for allowing at least a portion of the refrigerant to bypass the refrigeration circuit side of a coupling heat exchanger for increasing the temperature of the refrigerant upstream the gas cooler in order to meet increased heating demands.
- A method of operating a refrigeration and heating system according to an exemplary embodiment of the invention comprises the steps of
-
- circulating a refrigerant through a refrigeration circuit;
- circulating a heating fluid through a heating circuit; the heating circuit and the refrigeration circuit being thermally coupled by means of a coupling heat exchanger allowing heat to transfer from the refrigeration circuit to the heating circuit; and
- increasing the temperature of the refrigerant circulating within the refrigeration circuit by allowing at least a portion of the refrigerant to bypass the coupling heat exchanger in order to meet increased heating demands.
- According to an idea of the invention the refrigeration process is made less efficient by increasing the temperature of the refrigerant circulating within the refrigeration circuit. This can be achieved either by delivering a portion of the heating fluid leaving the coupling heat exchanger directly back into the coupling heat exchanger by means of a heating fluid bypass valve connected between then outlet side and the inlet side of the coupling heat exchanger's heating circuit side or by allowing at least a portion of the refrigerant circulating within the refrigeration circuit to bypass the coupling heat exchanger. When the temperature of the refrigerant within the refrigeration circuit is increased, enhanced operation of the compressor(s) is needed in order to meet the required cooling demands. This results in more thermal heat, which may be used for heating purposes, being created without increasing the cooling capacity.
- For a system using carbon dioxide as a refrigerant it has been found that in average 33% more heating capacity can be generated, by maintaining the pressure and increasing the temperature of the refrigerant entering the gas cooler. In addition the thermal heat can be regulated without capacity stages. The additional heat generated by the compressor(s) can either be used for reducing the size of an external (e.g. electrical) heat source, which is used in state of the art systems in order to meet high heating demands, or even make an external heating source obsolete. As existing equipment can be used with only minor modifications, the implementation costs are low.
-
FIG. 1 shows a refrigeration andheating system 2 a according to a first exemplary embodiment of the invention; and -
FIG. 2 shows a refrigeration and heating system 2 b according to a second exemplary embodiment of the invention. - In the following, exemplary embodiments of the invention will be described in more detail with reference to the enclosed figures:
-
FIG. 1 shows a schematic view of a refrigeration andheating system 2 a according to a first exemplary embodiment of the invention. - The refrigeration and
heating system 2 a comprises arefrigeration circuit 4 and aheating circuit 20 thermally coupled with each other by acoupling heat exchanger 8, which is configured for transferring heat from therefrigeration circuit 4 to theheating circuit 20. - The
refrigeration circuit 4 in particular comprises in the direction of flow of a circulating refrigerant: a plurality ofcompressors 6 a, 6 b, 6 c fluidly connected in parallel for compressing and circulating a fluid refrigerant through therefrigeration circuit 4; a coupling heatexchanger bypass valve 34 allowing to selectively direct the flow of refrigerant leaving thecompressors 6 a, 6 b, 6 c either to arefrigeration circuit side 8 a of acoupling heat exchanger 8, which couples therefrigeration circuit 4 to theheating circuit 20, or to bypass saidcoupling heat exchanger 8 in order to direct the flow of refrigerant leaving the plurality ofcompressors 6 a, 6 b, 6 c directly to theinlet side 10 a of at least onegas cooler 10, which is fluidly connected to the outlet side of thecoupling heat exchanger 8. The outlet side 10 b of the at least onegas cooler 10 is connected via a gascooler bypass valve 24, which will be described in more detail further below, to the inlet side of a highpressure control device 12, which is configured for expanding the refrigerant from the high pressure generated by thecompressors 6 a, 6 b, 6 c to a lower medium pressure, before it enters into areceiver 26, which is configured for separating gas phase refrigerant collecting at the top of thereceiver 26 from liquid refrigerant, collecting at the bottom of thereceiver 26. The bottom of the receiver is fluidly connected to a mediumpressure expansion device 14 and anevaporator 16 fluidly connected downstream of the mediumpressure expansion device 14 for evaporating the expanded refrigerant thereby absorbing heat from the environment and providing the desired cooling capacity. The outlet side of theevaporator 16 is fluidly connected to the inlet lines 7 a, 7 b, 7 c of thecompressors 6 a, 6 b, 6 c closing the refrigeration cycle. - The
compressors 6 a, 6 b, 6 c may be individually switched on and off allowing to vary their combined performance. Optionally, at least one of thecompressors 6 a, 6 b, 6 c may be provided as a variable speed compressor 6 a allowing to continuously vary its performance in order to adjust the capacity provided by thecompressors 6 a, 6 b, 6 c even more precisely. - A
flash gas line 28 comprising aflash gas valve 30 and anoptional heat exchanger 32, which is configured for allowing heat exchange between the flash gas flowing through theflash gas line 28 and the liquid refrigerant leaving the bottom of thereceiver 26, fluidly connects an upper portion of thereceiver 26 to inlet lines 7 a, 7 b, 7 c of thecompressors 6 a, 6 b, 6 c allowing, by controlling theflash gas valve 30, flash gas to selectively exit from the top of the receiver and to flow to the inlet side of thecompressors 6 a, 6 b, 6 c. Selectively delivering flash gas from thereceiver 26 to the inlet lines 7 a, 7 b, 7 c of thecompressors 6 a, 6 b, 6 c allows to adjust the pressure with thereceiver 26. - An optional gas
cooler bypass line 18, which connects between theinlet side 10 a of thegas cooler 10 and the gascooler bypass valve 24 arranged between the outlet side 10 b of thegas cooler 10 and the highpressure control device 12, allows to selectively bypass thegas cooler 10 by opening the gascooler bypass valve 24 in case so much heat is transferred from therefrigerant circuit 4 to theheating circuit 20 by means of thecoupling heat exchanger 8 that no further cooling of the circulating refrigerant is necessary. - The
heating circuit 20 comprises in the direction of flow of a circulating heating fluid a heating circuit side 8 b of thecoupling heat exchanger 8 and at least oneheat consumer 22 for consuming the transferred heat, e.g. for heating water and/or (parts of) a building. - The
coupling heat exchanger 8 is in thermal connection with therefrigerant circuit side 8 a of thecoupling heat exchanger 8 allowing heat to transfer from the refrigerant circulating withinrefrigeration circuit 4 and flowing through therefrigeration circuit side 8 a of thecoupling heat exchanger 8 to the heating fluid circulating within theheating circuit 20 and flowing through the heating circuit side 8 b of thecoupling heat exchanger 8. At least oneheating fluid pump 36 may be provided for supporting the circulation of the heating fluid through theheating circuit 20. - According to an exemplary embodiment of the invention, at least one heating fluid bypass valve 23 is connected in parallel to the at least one
heat consumer 22 allowing to partially bypass said at least oneheat consumer 22 by at least partially opening the at least one heating fluid bypass valve 23 for allowing fluid to flow from the outlet side of the coupling heat exchanger's 8 heating circuit side 8 b of thecoupling heat exchanger 8 to the inlet side of said heating circuit side 8 b of thecoupling heat exchanger 8 without being cooled by delivering heat to the at least oneheat consumer 22. As a result, the temperature within thecoupling heat exchanger 8 will increase and the temperature of the refrigerant leaving therefrigeration circuit side 8 a of thecoupling heat exchanger 8 will increase, as well. - The increased temperature of the refrigerant will result in more flash gas being produced downstream of the high
pressure control device 12, and as a result, therefrigeration circuit 4 will operate with less efficiency. In order to maintain the desired refrigeration capacity at theevaporator 16, the performance of thecompressors 6 a, 6 b, 6 c has to be increased, e.g. by switching onadditional compressors 6 a, 6 b, 6 c or increasing the rotational speed of anadjustable compressor 6 a, 6 b, 6 c. An increased operation of thecompressors 6 a, 6 b, 6 c will add more thermal energy into the refrigeration andheating system 2 a, which is used for providing the desired heat at the heat consumer(s) 22. - The refrigeration and
heating system 2 a further comprises acontrol unit 38 for controlling thecompressors 6 a, 6 b, 6 c, theswitchable valves refrigeration circuit 4 and in particular the heating fluid bypass valve 23 in order to provide the desired cooling and heating capacities. Thecontrol unit 38 may control thecompressors 6 a, 6 b, 6 c andvalves - In order to enable the
control unit 38 to control thecompressors 6 a, 6 b, 6 c andvalves refrigerant pressure sensor 40, arefrigerant temperature sensor 42, a heating fluid temperature sensor 44 and an ambientair temperature sensor 46 may be provided, allowing thecontrol unit 38 to control thecompressors 6 a, 6 b, 6 c andvalves refrigerant pressure sensor 40 may in particular be located upstream the highpressure control valve 12. -
FIG. 2 shows a schematic view of a refrigeration and heating system 2 b according to a second exemplary embodiment of the invention. - The features of the refrigeration and heating system 2 b which are identical to the features of the first embodiment shown in
FIG. 1 are denoted with the same reference signs and will not be discussed in detail again. - In the refrigeration and heating system 2 b according to the second embodiment the heat
exchanger bypass valve 34 is provided as anadjustable mixing valve 34, which may be controlled by thecontrol unit 38 to selectively allow a portion of the refrigerant to bypass thecoupling heat exchanger 8 in order to increase the temperature of the refrigerant upstream thegas cooler 10. - As the temperature of the refrigerant may be regulated by means of the heat
exchanger bypass valve 34, the heating fluid bypass valve 23, which has been described in the context of the first embodiment, is optional and may be omitted in the refrigeration and heating system 2 b according to the second embodiment. - Furthermore, in said second embodiment, as it is shown in
FIG. 2 , a flashgas compressor line 29 fluidly connects between an upper portion of thereceiver 26 and theinlet side 7 d of an additional flash gas compressor (economizer compressor) 6 d. The output side of said flash gas compressor 6 d is connected with the outputs sides of theother compressors 6 a, 6 b, 6 c. Providing a separate flash gas compressor 6 d allows for an efficient compression of the flash gas delivered from therefrigerant receiver 26. - A flash gas compressor 6 d and the flash
gas compressor line 29 as shown inFIG. 2 may by employed in the first embodiment comprising a heating fluid bypass valve 23 instead of an adjustable headexchanger bypass valve 34, as well. The flash gas compressor 6 d and the flashgas compressor line 29 may be employed alternatively or in addition to theflash gas line 28 comprising theflash gas valve 30 as shown inFIG. 1 . - A number of optional features are set out in the following. These features may be realized in particular embodiments, alone or in combination with any of the other features:
- In an embodiment the bypass valve is a continuously adjustable valve allowing to selectively adjust the flow of heating fluid bypassing the heat consumer(s) with high accuracy.
- In an embodiment the refrigeration circuit comprises a gas cooler bypass line and a gas cooler bypass valve allowing refrigerant to selectively bypass the gas cooler(s) in case the temperature of the refrigerant leaving the coupling heat exchanger is low enough so that no further cooling of the refrigerant is necessary.
- In an embodiment a refrigerant receiver is provided downstream of the gas cooler for separating gas phase refrigerant from liquid phase refrigerant and storing said refrigerant. Such a separation, which allows to deliver only liquid refrigerant to the expansion device which is located upstream of the evaporator, will enhance the efficiency of the refrigeration circuit.
- In an embodiment a high pressure control device is provided upstream of the refrigerant receiver in order to expand the refrigerant leaving the gas cooler before entering the receiver.
- In an embodiment a flash gas line fluidly connects between an upper portion of the refrigerant receiver and an inlet line of the at least one compressor for allowing flash gas, which collects at the top of the receiver, to flow from the receiver directly to the inlet side of the compressor(s) bypassing the medium expansion device(s) and the evaporator(s).
- In an embodiment a flash gas valve provided in the flash gas line allows to control and regulate the flow of flash gas through the flash gas line and to adjust the pressure within the receiver.
- Additionally or alternatively a flash gas compressor line may fluidly connect the upper portion of the refrigerant receiver with an inlet line of an additional flash gas compressor.
- In an embodiment an additional flash gas heat exchanger allows heat exchange between the flash gas flowing through the flash gas line and refrigerant leaving from the bottom of the receiver. This heat exchange may improve the efficiency of the refrigeration circuit even further.
- In an embodiment the control unit for controlling the at least one compressor, the heating fluid bypass valve and/or the gas cooler bypass valve comprises a microcomputer which is configured for running an appropriate program controlling the operation of the combined refrigeration and heating system.
- In an embodiment the refrigeration and heating system further comprises at least one of a refrigerant pressure sensor, a refrigerant temperature sensor, a heating fluid temperature sensor and/or an ambient air temperature sensor functionally connected to the control unit for allowing the control unit to control the compressors, the heating fluid bypass valve and/or the gas cooler bypass valve based on the measured temperatures and/or pressures in order to optimally adjust the operation of the refrigeration and heating system.
- In an embodiment the refrigerant comprises carbon dioxide, which provides an efficient, inflammable, non-toxic and environmentally acceptable refrigerant, which partly operates in transcritical conditions. The heating fluid in particular may include water, which may in particular comprise an anti-corrosive additive.
- In an embodiment the method of operating a refrigeration and heating system includes the step of controlling a controllable valve, which is connected between the outlet and the inlet of the heating circuit side of the coupling heat exchanger, for selectively allowing a portion of the heating fluid to flow directly from an outlet to an inlet of the heating circuit side of the coupling heat exchanger bypassing the at least one heat consumer.
- In an embodiment the method of operating a refrigeration and heating system includes the step of controlling an adjustable heat exchanger bypass valve for selectively allowing a portion of the heating fluid to bypass the coupling heat exchanger in order to increase the temperature of the refrigerant circulating within the refrigeration circuit.
- In an embodiment the method may further include measuring the temperature of the refrigerant circulating within the refrigeration circuit and/or the temperature of the heating fluid circulating within the heating circuit and controlling the controllable valve, the adjustable heat exchanger bypass valve and/or the at least one compressor based on the measured temperature of the circulating refrigerant and/or the measured temperature of the heating fluid, respectively, in order to set an optimal operating point of the refrigeration circuit.
- Alternatively or additionally the method may further include measuring the pressure of the refrigerant circulating within the refrigeration circuit, in particular upstream the high pressure control valve and controlling the controllable bypass valve, the adjustable heat exchanger bypass valve and/or the at least one compressor based on the measured pressure in order to set the optimal point of operation of the refrigeration circuit.
- In an embodiment the method may further comprise measuring the ambient temperature and controlling the controllable valve based on the measured ambient temperature and/or determining the heating and/or cooling demands and controlling the controllable valve, the adjustable heat exchanger bypass valve and/or the at least one compressor based on said demands.
- The method may also include to determine the heating and/or cooling demands and controlling the controllable valve, the adjustable heat exchanger bypass valve and/or the at least one compressor based on said demands.
- While the invention has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition many modifications may be made to adopt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention include all embodiments falling within the scope of the dependent claims.
-
- 2 a, 2 b refrigeration and heating system
- 4 refrigeration circuit
- 6 a, 6 b, 6 c at least one compressor
- 6 d flash gas compressor
- 7 a, 7 b, 7 c, 7 d compressor inlet lines
- 8 coupling heat exchanger
- 8 a refrigeration circuit side of the heat exchanger
- 8 b heating circuit side of the heat exchanger
- 10 gas cooler;
- 10 a inlet side of the gas cooler;
- 10 b outlet side of the gas cooler;
- 12 high pressure control device
- 14 medium pressure expansion device
- 16 evaporator
- 18 gas cooler bypass line
- 20 heating circuit
- 22 heat consumer
- 23 heating fluid bypass valve
- 24 gas cooler bypass valve
- 26 refrigerant receiver
- 28 flash gas line
- 29 flash gas compressor line
- 30 flash gas valve/medium pressure control valve
- 32 flash gas heat exchanger
- 34 heat exchanger bypass valve/adjustable mixing valve
- 36 heating fluid pump
- 38 control unit
- 40 refrigerant pressure sensor
- 42 refrigerant temperature sensor
- 44 heating fluid temperature sensor
- 46 ambient air temperature sensor
Claims (22)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/EP2014/078847 WO2016096051A1 (en) | 2014-12-19 | 2014-12-19 | Refrigeration and heating system |
Publications (1)
Publication Number | Publication Date |
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US20170356681A1 true US20170356681A1 (en) | 2017-12-14 |
Family
ID=52282718
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US15/537,683 Abandoned US20170356681A1 (en) | 2014-12-19 | 2014-12-19 | Refrigeration and heating system |
Country Status (3)
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US (1) | US20170356681A1 (en) |
EP (1) | EP3234480A1 (en) |
WO (1) | WO2016096051A1 (en) |
Cited By (1)
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US20180066872A1 (en) * | 2015-05-13 | 2018-03-08 | Carrier Corporation | Ejector refrigeration circuit |
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FR2378242A1 (en) * | 1977-01-19 | 1978-08-18 | Vironneau Pierre | Utilisation of refrigeration plant for heating building - uses heat exchanger between compressor and condenser to supply hot water to heating system |
US4850198A (en) * | 1989-01-17 | 1989-07-25 | American Standard Inc. | Time based cooling below set point temperature |
US5568732A (en) * | 1994-04-12 | 1996-10-29 | Kabushiki Kaisha Toshiba | Air conditioning apparatus and method of controlling same |
US20090019878A1 (en) * | 2005-02-18 | 2009-01-22 | Gupte Neelkanth S | Refrigeration circuit with improved liquid/vapour receiver |
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JP2006052934A (en) * | 2004-07-12 | 2006-02-23 | Sanyo Electric Co Ltd | Heat exchange apparatus and refrigerating machine |
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2014
- 2014-12-19 WO PCT/EP2014/078847 patent/WO2016096051A1/en active Application Filing
- 2014-12-19 EP EP14823983.3A patent/EP3234480A1/en active Pending
- 2014-12-19 US US15/537,683 patent/US20170356681A1/en not_active Abandoned
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FR2378242A1 (en) * | 1977-01-19 | 1978-08-18 | Vironneau Pierre | Utilisation of refrigeration plant for heating building - uses heat exchanger between compressor and condenser to supply hot water to heating system |
US4850198A (en) * | 1989-01-17 | 1989-07-25 | American Standard Inc. | Time based cooling below set point temperature |
US5568732A (en) * | 1994-04-12 | 1996-10-29 | Kabushiki Kaisha Toshiba | Air conditioning apparatus and method of controlling same |
US20090019878A1 (en) * | 2005-02-18 | 2009-01-22 | Gupte Neelkanth S | Refrigeration circuit with improved liquid/vapour receiver |
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US20180066872A1 (en) * | 2015-05-13 | 2018-03-08 | Carrier Corporation | Ejector refrigeration circuit |
US10823461B2 (en) * | 2015-05-13 | 2020-11-03 | Carrier Corporation | Ejector refrigeration circuit |
Also Published As
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EP3234480A1 (en) | 2017-10-25 |
WO2016096051A1 (en) | 2016-06-23 |
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