EP3234480A1 - Système de réfrigération et de chauffage - Google Patents

Système de réfrigération et de chauffage

Info

Publication number
EP3234480A1
EP3234480A1 EP14823983.3A EP14823983A EP3234480A1 EP 3234480 A1 EP3234480 A1 EP 3234480A1 EP 14823983 A EP14823983 A EP 14823983A EP 3234480 A1 EP3234480 A1 EP 3234480A1
Authority
EP
European Patent Office
Prior art keywords
refrigeration
heating
refrigerant
heat exchanger
heating system
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.)
Pending
Application number
EP14823983.3A
Other languages
German (de)
English (en)
Inventor
Christian Douven
Markus Hafkemeyer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carrier Corp
Original Assignee
Carrier Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Carrier Corp filed Critical Carrier Corp
Publication of EP3234480A1 publication Critical patent/EP3234480A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
    • F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2309/00—Gas cycle refrigeration machines
    • F25B2309/06—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide
    • F25B2309/061—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide with cycle highest pressure above the supercritical pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2339/00—Details of evaporators; Details of condensers
    • F25B2339/04—Details of condensers
    • F25B2339/047—Water-cooled condensers
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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 heati ng 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 circulati ng 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 increasi ng 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 ci rculating 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.
  • Figure 1 shows a refrigeration and heating system 2a according to a first exemplary embodiment of the invention
  • Figure 2 shows a refrigeration and heating system 2b according to a second exemplary embodiment of the invention.
  • Figure 1 shows a schematic view of a refrigeration and heating system 2a according to a first exemplary embodiment of the invention.
  • the refrigeration and heating system 2a 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 6a, 6b, 6c 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 6a, 6b, 6c either to a refrigeration circuit side 8a 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 6a, 6b, 6c directly to the inlet side 10a of at least one gas cooler 10, which is fluidly connected to the outlet side of the coupling heat exchanger 8.
  • the outlet side 10b 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 6a, 6b, 6c to a lower medium pressure, before it enters into a receiver 26, which is configured for separating gas phase refrigera nt 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 7a, 7b, 7c of the compressors 6a, 6b, 6c closing the refrigeration cycle.
  • the compressors 6a, 6b, 6c may be individually switched on and off allowing to va ry their combined performance.
  • at least one of the compressors 6a, 6b, 6c may be provided as a variable speed compressor 6a allowing to continuously vary its performance in order to adjust the capacity provided by the compressors 6a, 6b, 6c 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, fluidiy connects an upper portion of the receiver 26 to inlet lines 7a, 7b, 7c of the compressors 6a, 6b, 6c 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 6a, 6b, 6c. Selectively delivering flash gas from the receiver 26 to the inlet lines 7a, 7b, 7c of the compressors 6a, 6b, 6c allows to adjust the pressure with the receiver 26.
  • An optional gas cooler bypass line 18, which connects between the inlet side 10a of the gas cooler 10 and the gas cooler bypass valve 24 arranged between the outlet side 10b 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 heati ng fluid a heating circuit side 8b 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 8a of the coupling heat exchanger 8 allowing heat to transfer from the refrigerant ci rculating within refrigeration circuit 4 and flowing through the refrigeration circuit side 8a of the coupling heat exchanger 8 to the heating fluid circulating within the heating circuit 20 and flowing through the heating circuit side 8b 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 vaive 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 8b of the coupling heat exchanger 8 to the inlet side of said heating circuit side 8b 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 8a 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 6a, 6b, 6c has to be increased, e.g. by switching on additional compressors 6a, 6b, 6c or increasing the rotational speed of an adjustable compressor 6a, 6b, 6c.
  • An increased operation of the compressors 6a, 6b, 6c will add more thermal energy into the refrigeration and heating system 2a, which is used for providing the desired heat at the heat consumer(s) 22.
  • the refrigeration and heating system 2a further comprises a control unit 38 for controlling the compressors 6a, 6b, 6c, 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 6a, 6b, 6c 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 6a, 6b, 6c 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,
  • Figure 2 shows a schematic view of a refrigeration and heating system 2b 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 which has been described in the context of the first embodiment, is optional and may be omitted in the refrigeration and heating system 2b 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 7d of an additional flash gas compressor (economizer compressor) 6d ,
  • the output side of said flash gas compressor 6d is connected with the outputs sides of the other compressors 6a, 6b, 6c.
  • a flash gas compressor 6d and the flash gas compressor line 29 as shown in Figure 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 6d 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 Figure 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 coo ⁇ er 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 di rectly 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 adj ustable 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.
  • 6a, 6b, 6c at least one compressor

Landscapes

  • 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)
  • Steam Or Hot-Water Central Heating Systems (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

L'invention concerne un procédé de mise en œuvre d'un système de réfrigération et de chauffage (2a, 2b), comprenant : la circulation d'un fluide frigorigène dans un circuit de réfrigération (4) qui comprend dans le sens de la circulation du fluide frigorigène en circulation : au moins un compresseur (6a, 6b, 6c) ; un côté circuit de réfrigération (8a) d'un échangeur de chaleur de couplage (8) ; au moins un refroidisseur de gaz (10) ; au moins un détendeur (12, 14) ; et au moins un évaporateur (16) ; et la circulation d'un fluide de chauffage dans un circuit de chauffage (20) qui comprend un côté circuit de chauffage (8b) de l'échangeur de chaleur de couplage (8) et au moins un consommateur de chaleur (22) ; l'échangeur de chaleur de couplage (8) étant conçu pour le transfert de chaleur du fluide frigorigène en circulation au fluide chauffant en circulation. Le procédé comprend en outre l'augmentation de la température du fluide frigorigène entrant dans ledit ou lesdits refroidisseurs de gaz (10) afin de satisfaire aux demandes de chauffage accrues par le fait de permettre à au moins une partie du fluide chauffant de circuler directement d'une sortie vers une entrée du côté circuit de chauffage (8b) de l'échangeur de chaleur de couplage (8) en contournant ledit ou lesdits consommateurs de chaleur (22) ou par le fait de permettre à au moins une partie du fluide frigorigène circulant dans le circuit de réfrigération (4) de contourner l'échangeur de chaleur de couplage (8).
EP14823983.3A 2014-12-19 2014-12-19 Système de réfrigération et de chauffage Pending EP3234480A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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FR2378242A1 (fr) * 1977-01-19 1978-08-18 Vironneau Pierre Procede de recuperation de calories sur une centrale frigorifique et installation le mettant en oeuvre
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WO2016096051A1 (fr) 2016-06-23

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