EP2751500B1 - Circuit de réfrigération et procédé de réfrigération assurant une récupération de la chaleur - Google Patents

Circuit de réfrigération et procédé de réfrigération assurant une récupération de la chaleur Download PDF

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Publication number
EP2751500B1
EP2751500B1 EP12710975.9A EP12710975A EP2751500B1 EP 2751500 B1 EP2751500 B1 EP 2751500B1 EP 12710975 A EP12710975 A EP 12710975A EP 2751500 B1 EP2751500 B1 EP 2751500B1
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EP
European Patent Office
Prior art keywords
heat
refrigeration circuit
heat exchanger
refrigerant
regulation valve
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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Application number
EP12710975.9A
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German (de)
English (en)
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EP2751500A1 (fr
Inventor
Alexander Tambovtsev
Ilya TITKOV
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Carrier Corp
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Carrier Corp
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Priority claimed from PCT/EP2011/065196 external-priority patent/WO2013029687A1/fr
Application filed by Carrier Corp filed Critical Carrier Corp
Priority to EP12710975.9A priority Critical patent/EP2751500B1/fr
Publication of EP2751500A1 publication Critical patent/EP2751500A1/fr
Application granted granted Critical
Publication of EP2751500B1 publication Critical patent/EP2751500B1/fr
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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
    • F25B6/00—Compression machines, plants or systems, with several condenser circuits
    • F25B6/02—Compression machines, plants or systems, with several condenser circuits arranged in parallel
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
    • 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
    • F25B2400/07—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
    • F25B2600/25—Control of valves
    • F25B2600/2507—Flow-diverting 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/195—Pressures of 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2116—Temperatures of a condenser
    • F25B2700/21161—Temperatures of a condenser of the fluid heated by 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2116—Temperatures of a condenser
    • F25B2700/21163—Temperatures of a condenser of the refrigerant at the outlet of 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
    • F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit

Definitions

  • the invention relates to a refrigeration system and a refrigeration method for providing heat recovery.
  • Cooling circuits of refrigeration installations can include heat recovery units which utilize the heat from the compressed hot refrigerant discharged from the compressor for heating.
  • One example of such heat recovery is to use such heat to heat up water which can be used as warm or hot water for domestic use.
  • the demand for such warm or hot water for domestic use can vary substantially for different buildings and applications, and can vary significantly over time.
  • CH 697 593 B1 discloses a heat pump device which has a refrigerant circuit with a heat exchanger for supplying heat to a heating system, and another heat exchanger for dissipating the heat from a cooling system.
  • a compensation unit with an external heat exchanger is designed for absorbing the heat of the heating system from an external medium e.g. water, by the external heat exchanger.
  • the compensation unit is designed for delivering the heat from the cooling system to the external medium by the external heat exchanger.
  • a refrigerator has a discharge three-way valve for connecting the discharge side of a compressor to at least either a hot water heat exchanger or an air heat exchanger and has a suction three-way valve for connecting the suction side of the compressor to at least either the air heat exchanger or a cold water heat exchanger.
  • a controller regulates the opening of the discharge three-way valve such that a refrigerant with a flow rate higher than a minimum flow rate determined based on an outside air temperature flows to the air heat exchanger.
  • US 2009/120110 A1 discloses a method for providing controllable amounts of heat recovery from a refrigerant circuit.
  • the method comprises the steps of providing a cooling circuit comprising a compressor, a condenser, an expansion device and an evaporator connected in series by refrigerant flow lines; providing a heat recovery circuit comprising a heat recovery heat exchanger, the heat recovery circuit being connected to the cooling circuit so that the heat recovery heat exchanger is in parallel with the condenser, and the heat recovery heat exchanger being in heat exchange relationship with a fluid to be heated based upon an end-user demand for heat; and selectively flowing refrigerant through the condenser of the cooling circuit in a cooling mode and the heat recovery heat exchanger of the heat recovery circuit in a heat recovery mode so as to maintain temperature of the fluid within a temperature band around a set point provided by the end user.
  • a desired amount of between 0 and 100% of the system's heat transfer capability can be transferred to the fluid to be heated by periodically switching ("cycling") between the cooling mode and the heat recovery mode. This makes it necessary to perform multiple switching operations and results in changes of the heat transfer over time which leads to a continuously changing operation of the system and a quite complex control.
  • Exemplary embodiments of the invention comprise a refrigeration circuit circulating a refrigerant and comprising in the direction of flow of the refrigerant: at least one compressor; at least one heat rejecting heat exchanger; a receiver (7); at least one expansion device; and at least one evaporator.
  • a refrigeration circuit according to an exemplary embodiment of the invention further comprises at least one heat recovery heat exchanger having a refrigeration circuit side and heat recovery system side and being configured to transfer heat between the refrigeration circuit side and the heat recovery system side.
  • the refrigeration circuit side is fluidly connected between the outlet side of at least one compressor and a receiver outlet line for flowing circulating refrigerant through the refrigeration circuit side of the at least one heat recovery heat exchanger.
  • the refrigeration circuit further comprises at least one regulation valve, which is switchable between an open position, in which the regulation valve is completely open, a closed position, in which the regulation valve is completely closed, and at least one intermediate position, in which the regulation valve is partially open having an opening degree / opening cross section which is smaller than in the open position.
  • the regulation valve is a three-way valve which is arranged between the receiver and the expansion device and which is fluidly connected to the outlet side of the refrigeration circuit side for controlling the flow of refrigerant flowing through the refrigeration circuit side of the at least one heat recovery heat exchanger and for controlling the flow of refrigerant from the receiver to the expansion device.
  • Exemplary embodiments of the invention further include a method of operating a refrigeration circuit with a circulating refrigerant and comprising in the flow-direction of the refrigerant least one compressor; at least one heat rejecting heat exchanger; a receiver; at least one expansion device; at least one evaporator and at least one heat recovery heat exchanger, which comprises a refrigeration circuit side and heat recovery system side and is configured to transfer heat from the circulating refrigerant to a heat recovery system.
  • the refrigeration circuit side of the heat recovery heat exchanger is connected between the outlet side of at least one compressor and a receiver outlet line for flowing refrigerant through the refrigeration circuit side.
  • a regulation valve which is a three-way valve arranged between the receiver and the expansion device and fluidly connected to the outlet side of the refrigeration circuit side, is configured to regulate the flow of refrigerant flowing through the refrigerant circuit side of the heat recovery heat exchanger and the method comprises the step of regulating the flow of refrigerant flowing through the refrigeration circuit side of the heat recovery heat exchanger by controlling the regulation valve to be switched between an open position, in which the regulation valve is completely open, a closed position, in which the regulation valve is completely closed, and at least one intermediate position in which the regulation valve is partially open having an opening degree / opening cross section which is smaller than in the open position.
  • a first embodiment of a refrigeration circuit 101 which is not part of the claimed invention, is depicted in the middle and right-hand sides of figure 1 inside the box surrounded by a dashed line. On the left-hand side of the figure part of a heat recovery system 14 is shown.
  • the refrigeration circuit 101 comprises in flow direction of a refrigerant as indicated by arrows three compressors 4a, 4b, 4c connected in parallel for compressing the refrigerant to a relatively high pressure.
  • three compressors 4a, 4b, 4c is only exemplary and any suitable number of compressors 4a, 4b, 4c including only one compressor 4a may be used, and that compressors connected in series can be provided as well.
  • a pressure line 2 attaches to the outlet side of the compressors 4a, 4b, 4c and branches into a first pressure line portion 2a leading to conventional air-cooled heat rejecting heat exchangers 6, 6a, 6b and into a second pressure line portion 2b leading to a refrigeration circuit side 12a of a heat recovery heat exchanger 12.
  • the high pressure refrigerant leaving the compressors 4a, 4b, 4c flowing through the second pressure line portion 2b and the refrigeration circuit side 12a of the heat recovery heat exchanger 12 arranged downstream of the compressors 4a, 4b, 4c transfers heat to a heat receiving fluid flowing, as indicated by the arrow, through the heat recovery system side 12b of the heat recovery heat exchanger 12.
  • the flow of the heat receiving fluid is driven by a fluid pump 20.
  • a heat receiving fluid temperature sensor 28 is arranged in the fluid conduit 19 connected to the heat recovery system side 12b of the heat recovery heat exchanger 12, particularly at a position behind the heat recovery system side 12b, in order to measure the temperature of the heat receiving fluid leaving the heat recovery heat exchanger 12 that has been warmed up against the hot compressed refrigerant flowing through the refrigeration circuit side 12a of the heat recovery heat exchanger 12.
  • the flow of high pressure refrigerant flowing through the second pressure line portion 2b and the refrigeration circuit side 12a of the heat recovery heat exchanger 12 is controlled by means of a first regulation valve 16 which is arranged downstream of the refrigeration circuit side 12a of the heat recovery heat exchanger 12.
  • the first regulation valve 16 is switchable between an open position, in which the first regulation valve 16 is completely open, a closed position, in which the first regulation valve 16 is completely closed and does not allow any refrigerant to flow through the refrigeration circuit side 12a of a heat recovery heat exchanger 12, and at least one intermediate position, in which the first regulation valve 16 is partially open with a smaller opening degree as in the completely open position in order to allow a throttled flow of refrigerant to flow through the refrigeration circuit side 12a of a heat recovery heat exchanger 12.
  • the amount of heat transfer from the refrigerant circulating in the refrigeration circuit 101 to the heat receiving fluid flowing in the heat recovery system 14 via the heat recovery heat exchanger 12 may be controlled by means of the first regulation valve 16.
  • the first regulation valve 16 comprises a plurality of intermediate positions, each of the intermediate positions representing a different opening degree / cross section allowing a fine adjustment of the amount of compressed hot refrigerant flowing through the refrigeration circuit side 12a of the heat recovery heat exchanger 12.
  • the opening degree / cross section of the first regulation valve 16 is continuously adjustable between the closed position and the completely open position allowing to continuously regulate the flow of refrigerant flowing through the refrigeration circuit side 12a of the heat recovery heat exchanger 12.
  • the first regulation valve 16 is arranged downstream and not upstream of the heat recovery heat exchanger 12, it does not act as a throttle in the second portion 2b of the pressure line 2 upstream of the heat recovery heat exchanger 12 even when it is switched to an intermediate position.
  • Such a throttle located upstream of the heat recovery heat exchanger 12 would undesirably expand the high pressure refrigerant before entering the heat recovery heat exchanger 12.
  • a refrigerant temperature sensor 24 and a refrigerant pressure sensor 26 are arranged in the second portion 2b of the pressure line 2 in order to measure the temperature and, respectively, the pressure of the refrigerant flowing through the refrigeration circuit side 12a of the heat recovery heat exchanger 12.
  • the temperature sensor 24 is arranged downstream of the heat recovery heat exchanger 12 in order to measure the temperature of the refrigerant after it has been cooled down in the refrigeration circuit side 12a of the heat recovery heat exchanger 12 in heat exchange against the heat receiving fluid flowing through the heat recovery system side 12b of the heat recovery heat exchanger 12.
  • the pressure sensor 26 is arranged upstream of the heat recovery heat exchanger 12. It is, however, possible, to arrange the pressure sensor 26 downstream of the heat recovery heat exchanger 12, as well, as long as it is arranged upstream of the first regulation valve 16.
  • the outlet side of the first regulation valve 16 is fluidly connected to an inlet side arranged at an upper portion of a receiver 7.
  • the receiver 7 is configured for collecting the refrigerant. Typically liquid refrigerant collects at the bottom portion of the receiver 7 and gaseous refrigerant collects in an upper gas space of the receiver 7.
  • An outlet of the receiver 7 is fluidly connected to an expansion device 8 by means of an receiver outlet line 11.
  • Liquid refrigerant leaving the receiver 7 is expanded by the expansion device 8 and evaporated in an evaporator 10 which is arranged and fluidly connected downstream of the expansion device 8.
  • the refrigerant When the refrigerant is evaporated in the evaporator 10 it transfers coldness to and absorbs heat from the environment before flowing back to the compressors 4a, 4b, 4c through the suction line connecting the evaporator 10 to the inlet side of the compressors 4a, 4b, 4c.
  • the heat is for example transferred to ambient air or a cooling water circuit connected to the heat rejecting heat exchanger 6.
  • the at least one heat rejecting heat exchanger 6 may comprise at least one fan in order to suck or blow ambient air through the heat rejecting heat exchanger 6 in order to enhance the transfer of heat from the refrigerant to the environment.
  • two heat rejecting heat exchangers 6a, 6b are provided, which are connected parallel to each other.
  • Respective switchable valves 5a, 5b are provided at the inlet sides of each of the heat rejecting heat exchangers 6a, 6b in order to selectively activate and deactivate the respective heat rejecting heat exchanger 6a, 6b.
  • the two heat rejecting heat exchangers 6a, 6b may be either separate, individual heat rejecting heat exchangers 6a, 6b or heat exchanger portions 6a, 6b of a common heat rejecting heat exchanger 6.
  • the switchable valves 5a, 5b which may be implemented as motor-actuated ball valves, are respectively switchable only between a completely open and a completely closed position. Switching one of the switchable valves 5a, 5b to a partially opened position would provide a throttle within the pressure line 2a upstream of the at least one heat rejecting heat exchanger 6 which would act as an expansion device expanding the refrigerant circulating within the refrigeration circuit 101. This expansion is undesirable at a position upstream of the heat rejecting heat exchangers 6a, 6b as it would negatively affect the efficiency of the at least one heat rejecting heat exchanger 6.
  • the outlet sides of the heat rejecting heat exchangers 6a, 6b are fluidly connected by means of heat exchanger outlet lines 3a, 3b and a receiver inlet line 3 to the receiver 7 for delivering the refrigerant leaving the heat rejecting heat exchanger(s) 6a, 6b to the receiver 7.
  • the portion of refrigerant flowing through the first pressure line portion 2a, the switchable valves 5a, 5b and the heat rejecting heat exchangers 6a, 6b mixes in the receiver 7 with the portion of refrigerant flowing through the second pressure line portion 2b, the refrigeration circuit side 12a of the heat recovery heat exchanger 12, and the first regulation valve 16, before the refrigerant is delivered to the expansion device 8 and the evaporator 10, as described before.
  • Providing at least two heat rejecting heat exchangers 6a, 6b or heat exchanger portions 6a, 6b in parallel which may be selectively activated and/or deactivated by respectively associated switchable valves 5a, 5b allows to adjust the heat rejecting capacity provided by the heat rejecting heat exchangers 6a, 6b or heat exchanger portions 6a, 6b to changing needs.
  • the two heat rejecting heat exchangers 6a, 6b or heat exchanger portions 6a, 6b may have the same heat rejecting capacity allowing to switch the heat rejecting capacity provided by the heat rejecting heat exchangers 6a, 6b or heat exchanger portions 6a, 6b between the full available heat rejecting capacity (100%), when both switchable valves 5a, 5b are open and both heat rejecting heat exchangers 6a, 6b or heat exchanger portions 6a, 6b are active, and half of the maximum heat rejecting capacity (50%) available, when only one of the switchable valves 5a, 5b is open and the second switchable valve 5a, 5b is closed so that only one of the heat rejecting heat exchangers 6a, 6b or heat exchanger portions 6a, 6b is active.
  • the heat rejecting capacity of a second of the heat rejecting heat exchangers 6b or heat exchanger portions 6a, 6b may be twice as large as the heat rejecting capacity of a first one of the heat rejecting heat exchangers 6a or heat exchanger portions 6a, 6b in order to allow to switch between one third (33%) of the maximum heat rejecting capacity by respectively activating only the first one of the heat rejecting heat exchangers 6a, 6b or heat exchanger portions 6a, 6b, two thirds (66%) of the maximum heat rejecting capacity by activating only the second one of the heat rejecting heat exchangers 6a, 6b, or heat exchanger portions 6a, 6b and full (100%) heat rejecting capacity by activating both heat rejecting heat exchangers 6a, 6b or heat exchanger portions 6a, 6b.
  • heat rejecting heat exchangers 6a, 6b with any other heat rejecting capacity ratio can be provided, and further heat rejecting heat exchangers 6a, 6b or heat rejecting heat exchanger portions 6a, 6b may be added in order to allow an even finer adjustment of the heat rejecting capacity provided by the heat rejecting heat exchangers 6a, 6b.
  • a flash gas tap line 9 fluidly connects the upper gas space portion of the receiver 7 to the inlet side of the compressors 4a, 4b, 4c allowing to transfer flash gas from the receiver 7 directly to the inlet side of the compressors 4a, 4b, 4c in order to enhance the performance of the refrigeration circuit 101.
  • the system further comprises a control unit 22, which is connected by electrical lines, which are not shown in the figure, to the compressors 4a, 4b, 4c, the switchable valves 5a, 5b, the first regulation valve 16 and/or the fluid pump 20 in order to control the operation of said devices.
  • a control unit 22 which is connected by electrical lines, which are not shown in the figure, to the compressors 4a, 4b, 4c, the switchable valves 5a, 5b, the first regulation valve 16 and/or the fluid pump 20 in order to control the operation of said devices.
  • the control unit 22 may operate based on the temperature and pressure values measured by the heat receiving fluid temperature sensor 28, the refrigerant temperature sensor 24 and/or the refrigerant pressure sensor 26.
  • the control unit 22 may be realized in the form of a single control unit 22 or by a plurality of (sub-)control units 22a, 22b, each of the (sub-)control units 22a, 22b being configured to control different portions of the system.
  • a first (sub-)control unit 22a may be provided for controlling the refrigeration circuit 101 and a second (sub-)control unit 22b may be provided for controlling the heat recovery system 14.
  • the control unit 22 may be configured to selectively switch the system between different modes in order to adjust the heat delivered from the refrigerant circulating within the refrigeration circuit 101 to the heat receiving fluid of the heat recovery system 14 according to the actual heat demand on the side of the heat recovery system 14.
  • a first mode of operation all the heat produced by the refrigeration circuit 101 is consumed by the heat recovery system 14.
  • the first regulation valve 16 is open and both switchable valves 5a, 5b are closed so that all the high pressure refrigerant leaving the compressors 4a, 4b, 4c flows through the second portion 2b of the pressure line 2 and the refrigeration circuit side 12a of the heat recovery heat exchanger 12 where it transfers its heat to the heat receiving fluid which is pumped by means of the fluid pump 20 through the heat recovery system side 12b of the heat recovery heat exchanger 12.
  • the heat generated within the refrigeration circuit 101 exceeds the heat demand of the heat recovery system 14.
  • the first regulation valve 16 is controlled in order to adjust the flow of refrigerant through the refrigeration circuit side 12a of the heat recovery heat exchanger 12 and thereby the amount of heat transferred to the heat receiving fluid flowing through the heat recovery system side 12b of the heat recovery heat exchanger 12 to match the actual demand of the heat recovery system 14. Any additional heat, which is not consumed by the heat recovery system 14 is transferred to the environment by means of the heat rejecting heat exchanger(s) 6a, 6b.
  • those heat rejecting heat exchangers 6a, 6b or heat rejecting heat exchanger portions 6a, 6b are activated by means of the switchable valves 5a, 5b that are necessary for transferring the remaining heat from the refrigerant circulating within the refrigeration circuit 101 to the environment.
  • one heat rejecting heat exchanger 6a, 6b or heat rejecting heat exchanger portion 6a, 6b is not sufficient in order to transfer all remaining heat from the refrigerant circulating within the refrigeration circuit 101, at least one additional heat rejecting heat exchanger 6a, 6b or heat rejecting heat exchanger portion 6a, 6b or all heat rejecting heat exchangers 6a, 6b / heat rejecting heat exchanger portions 6a, 6b are activated.
  • a third mode of operation no heat is demanded by the heat recovery system 14.
  • the first regulation valve 16 is closed completely so that no refrigerant is flowing through the refrigeration circuit side 12a of the heat recovery heat exchanger 12.
  • all the heat generated by the operation of the refrigeration circuit 101 is transferred from the refrigerant to the environment by means of at least one activated heat rejecting heat exchanger 6 or heat rejecting heat exchanger portion 6a, 6b.
  • those heat rejecting heat exchangers 6a, 6b or heat rejecting heat exchanger portion 6a, 6b are activated by means of the switchable valves 5a, 5b that are necessary for transferring the heat from the refrigerant circulating within the refrigeration circuit 101 to the environment.
  • the temperature of the heat receiving fluid flowing through the heat recovery system 14 is further adjustable by regulating the flow of the heat receiving fluid through the heat recovery system side 12b of the heat recovery heat exchanger 12 by means of the fluid pump 20.
  • the described first embodiment allows to accurately adjust the heat which is recovered by means of the heat recovery heat exchanger 12 and transferred to the heat recovery system 14. It eliminates the problem of a two-phase refrigerant flow leaving the refrigeration circuit side 12a of the heat recovery heat exchanger 12 if the heat demand of the heat recovery system 14 is not big enough for absorbing all the heat generated by the operation of the refrigeration circuit 101.
  • a refrigeration circuit 101 according to the disclosed first embodiment does not need a liquid separator in order to separate the liquid phase refrigerating portion and the gaseous phase refrigerating portion from the circulating refrigerant. This reduces the costs of the refrigerating circuit 101.
  • the control of the refrigeration circuit 101 and/or the heat recovery system 14 can be effected by appropriate software running in the control unit 22. This avoids negative influences which may occur during operation on an end-user's side like changes of the demanded heat.
  • the embodiment allows to use the heat rejecting heat exchanger 6 with two lockable coils avoiding the problem of holding the high pressure in the system on the required level during cold year seasons (winter mode).
  • Figure 2 shows a second embodiment of a refrigeration circuit 102, which is not part of the claimed invention.
  • the second embodiment shown in figure 2 is very similar to the first embodiment shown in figure 1 , the same features are denoted by the same reference signs and features which have not been changed with respect to the first embodiment will not be discussed in detail again.
  • the second embodiment of the refrigeration circuit 102 differs from the first embodiment in that the refrigerant line 17, which is fluidly connected to the outlet side of the first regulation valve 16, is not connected to the receiver inlet line 3 upstream of the receiver 7 but to the receiver outlet line 11 fluidly connecting the outlet provided at the bottom of the receiver 7 to the expansion device 8.
  • the refrigerant delivered from the refrigeration circuit side 12a of the heat recovery heat exchanger 12 is not fed into the receiver 7 together with the refrigerant delivered from the heat rejecting heat exchanger 6.
  • the refrigerant leaving the refrigeration circuit side 12a of the heat recovery heat exchanger 12 is delivered directly to the expansion device 8 via the refrigerant line 17 and the receiver outlet line 11.
  • the configuration according to the second embodiment shown in figure 2 may provide a more stable operation of the refrigeration circuit 102 showing less fluctuations than the configuration according to the first embodiment shown in figure 1 .
  • the refrigerant line 17 may be connected directly to the receiver 7.
  • Figure 3 shows a third embodiment of a refrigeration circuit 103, which is not part of the claimed invention. Again, features which are identical to the features of the first and second embodiments are denoted by the same reference signs and will not be discussed in detail again.
  • a second regulation valve 30 is arranged in the receiver inlet line 3 upstream of the receiver 7.
  • the refrigeration circuit 103 according to the third embodiment does not comprise switchable valves 5a, 5b respectively arranged upstream of the heat rejecting heat exchanger(s) 6, 6a, 6b or portions 6a, 6b of the heat rejecting heat exchanger 6 in order to selectively activate and deactivate the individual heat rejecting heat exchanger(s) 6a, 6b or portions 6a, 6b of the heat rejecting heat exchanger 6, respectively.
  • the refrigerant line 17 fluidly connects the outlet side of the first regulation valve 16 to the outlet side of the receiver 7.
  • the refrigerant line 17 may be connected directly to the receiver or to the inlet side of the receiver 7 similar to the embodiment shown in figure 1 .
  • the refrigerant line 17 may be connected to a portion of the receiver inlet line 3 connecting the second regulation valve 30 with the inlet side of the receiver 7.
  • the second regulation valve 30 is switchable between a fully open position, in which the second regulation valve 30 is completely open, and at least one intermediate position, in which the second regulation valve 30 is partially open providing a smaller opening than in the completely open position, in order to allow a throttled flow of refrigerant to flow from the heat rejecting heat exchanger 6 to the receiver 7.
  • the second regulation valve 30 thus allows to selectively control the flow of refrigerant flowing through the heat rejecting heat exchanger(s) 6, 6a, 6b or portions 6a, 6b of the heat rejecting heat exchanger 6, respectively, in order to adjust the heat rejecting capacity provided by the heat rejecting heat exchanger(s) 6, 6a, 6b to varying needs.
  • the refrigeration circuit 103 according to the third embodiment may be produced at lower costs than a refrigeration circuit 101, 102 according to the first and second embodiments.
  • the opening degree / cross section of the second regulation valve 30 is continuously adjustable between a completely closed position and the fully open position in order to allow to continuously control the flow of refrigerant flowing through the heat rejecting heat exchanger(s) 6, 6a, 6b or portions 6a, 6b of the heat rejecting heat exchanger 6.
  • Such a continuously adjustable second regulation valve 30 permits to adjust the heat rejecting capacity provided by the heat rejecting heat exchanger(s) 6, 6a, 6b continuously.
  • the second regulation valve 30 is arranged downstream of the heat rejecting heat exchanger(s) 6, 6a, 6b, the problem of providing a throttle within the pressure line 2a, which acts as an expansion device and expands the refrigerant circulating within the refrigeration circuit 103, as it has been discussed with respect to the first embodiment, does not occur.
  • FIG. 4 shows an embodiment of a refrigeration circuit 104 according to the claimed invention. Again, features which are identical to the features of the previous embodiments are denoted by the same reference signs and will not be discussed in detail again.
  • the refrigeration circuit 104 does not comprise first and/or second regulation valves 16, 30. Instead, a three-way regulation valve 32 connecting the refrigerant line 17 originating from the refrigeration circuit side 12a of the heat recovery heat exchanger 12 to the receiver outlet line 11 is arranged in the receiver outlet line 11.
  • the three-way regulation valve 32 is configured to adjust the amount of refrigerant flowing through the refrigeration circuit side 12a of the heat recovery heat exchanger 12 in order to control the capacity of the heat recovery system 14 according to the user's actual demands.
  • the three-way regulation valve 32 according to the fourth embodiment thus provides the functionality of the first regulation valve 16 according to the first three embodiments.
  • the three-way regulation valve 32 is further configured to adjust the flow of refrigerant flowing from the receiver 7 via the receiver outlet line 11 to the expansion device 8 in order to control the cooling capacity of the refrigeration circuit 104. This provides the same functionality as the second regulation valve 30 according to the third embodiment.
  • the functionalities of the first regulation valve 16 and of the second regulation valve 30 are combined in a single (three-way) valve 32.
  • the refrigeration circuit 104 of the fourth embodiment may additionally comprise switchable valves 5a, 5b provided at the respective inlet sides of each of the heat rejecting heat exchangers 6a, 6b or heat exchanger portions 6a, 6b in order to selectively activate and deactivate the respective heat rejecting heat exchangers 6a, 6b or heat exchanger portions 6a, 6b, as it has been discussed with respect to the first and second embodiments.
  • Controlling the switchable valves 5a, 5b for selectively activating and deactivating the respective heat rejecting heat exchangers 6a, 6b or heat exchanger portions 6a, 6b may provide a stepwise control of the cooling capacity of the refrigeration circuit 104 over a wide range.
  • Controlling the three-way regulation valve 32 which may be implemented as a continuously controllable regulation valve 32, additionally allows a fine grain control of the cooling capacity of the refrigeration circuit 104.
  • the cooling capacity of the refrigeration circuit 104 shown in figure 4 may be controlled smoothly over a wide range.
  • the three-way regulation valve 32 may be arranged in the receiver inlet line 3 upstream of the receiver 7, i.e. at the position of the second regulating valve 30 according to the third embodiment, in order to deliver the refrigerant delivered from the heat recovery heat exchanger 12 into the receiver 7 similar to the first embodiment shown in figure 1 .
  • the control is comparably simple. If the regulation valve has been set to the appropriate position in order to effect the required heat exchange to the heat recovery system side by means of the heat recovery heat exchanger and, if applicable, the respective heat-rejecting heat exchanger has been activated in addition in order to transfer the remaining heat to the environment, the system is running in a stable and constant manner. The only changes in operation will be caused by changes in demand on the heat recovery system side or at the evaporators. The number of switching operations is reduced to a minimum.
  • all the heat generated by the refrigeration circuit is recovered, which contributes to a high energy efficiency.
  • the regulation valve is switchable between the open position, the closed position and at least one intermediate position dependent on the heat demand on the heat recovery system side of the heat recovery heat exchanger. This allows to regulate the heat transferred to the heat recovery system by means of the regulation valve to match the actual heat demand of an end-user connected to the heat recovery system.
  • the regulation valve comprises a plurality of intermediate positions. This allows a fine adjustment of the refrigerant flow flowing through the refrigeration circuit side of the heat recovery heat exchanger and thereby the heat transferred to the heat recovery system.
  • the opening degree (cross section) of the regulation valve is continuously variable between the closed position and the (completely) open position. This allows to continuously adjust the heat transferred from the refrigeration circuit to the heat recovery system.
  • the regulation valve is arranged downstream of the heat recovery heat exchanger. This avoids that a partially opened regulation valve, i.e. a regulation valve which has been switched to an intermediate position, acts as a throttle partially expanding the refrigerant circulating within the refrigeration circuit upstream of the heat recovery heat exchanger and thereby degenerating the efficiency of the heat recovery heat exchanger.
  • the refrigeration circuit comprises at least two heat rejecting heat exchangers or heat rejecting heat exchanger portions. This allows to adjust the amount of heat rejected by the heat rejecting heat exchanger(s) by selectively activating and/or deactivating one or more of the heat rejecting heat exchangers or heat rejecting heat exchanger portions, respectively.
  • At least two of the heat rejecting heat exchangers or heat rejecting heat exchanger portions have different capacities. This provides additional options for adjusting the capacity provided by the activated heat rejecting heat exchangers or heat rejecting heat exchanger portions by activating an appropriate group of heat rejecting heat exchangers or heat rejecting heat exchanger portions.
  • a second heat rejecting heat exchanger or heat rejecting heat exchanger portion has a capacity which is twice as large as the capacity of a first heat rejecting heat exchanger or heat rejecting heat exchanger portion. This provides even more options for adjusting the capacity provided by the activated heat rejecting heat exchangers or heat rejecting heat exchanger portions by activating an appropriate group of heat rejecting heat exchangers or heat rejecting heat exchanger portions.
  • the refrigeration circuit comprises at least one switchable valve which is configured to control the flow of refrigerant flowing through a corresponding heat rejecting heat exchanger or heat rejecting heat exchanger portion. This allows to adjust the capacity provided by the heat rejecting heat exchangers or heat rejecting heat exchanger portions by opening and/or closing selected switchable valves.
  • a switchable valve is respectively associated to each of the heat rejecting heat exchangers or heat rejecting heat exchanger portions. This allows to activate and/or deactivate each of the heat rejecting heat exchangers or heat rejecting heat exchanger portions individually in order to adjust the capacity provided by the heat rejecting heat exchangers or heat rejecting heat exchanger portions.
  • At least one of the switchable valves is switchable only between a completely open and a completely closed position. This avoids that a partially opened switchable valve acts as a throttle expanding the refrigerant flowing through the refrigeration circuit upstream of the respective heat rejecting heat exchanger which would negatively effect the heat transferred from the refrigerant to the environment by means of the heat rejecting heat exchanger.
  • At least one of the switchable valves is a motor-actuated ball valve. This allows to conveniently open and close the switchable valve.
  • the at least one switchable valve is arranged upstream of the corresponding heat rejecting heat exchanger in order to allow to block the flow of refrigerant flowing into the respective heat rejecting heat exchanger.
  • the at least one switchable valve is arranged downstream of the corresponding heat rejecting heat exchanger in order to avoid that the switchable valve acts as an expansion device expanding the high pressure refrigerant upstream of the respective heat rejecting heat exchanger.
  • the at least one switchable valve is a second regulation valve, which is switchable between an open position and at least one partially closed position in order to allow to regulate the flow of refrigerant flowing through the corresponding heat rejecting heat exchanger.
  • the at least one switchable valve comprises a plurality of different partially closed positions in order to allow to gradually regulate the flow of refrigerant flowing through the corresponding heat rejecting heat exchanger.
  • the opening degree of the at least one switchable valve is continuously variable in order to allow to continuously regulate the flow of refrigerant flowing through the corresponding heat rejecting heat exchanger.
  • the refrigeration circuit comprises a receiver arranged between the at least one heat rejecting heat exchanger and the expansion device in order to receive and collect the refrigerant delivered by the at least one heat rejecting heat exchanger.
  • a receiver in particular allows to buffer an additional amount of refrigerant which is actually not needed for the operation of the refrigeration circuit.
  • the outlet side of the first regulation valve is fluidly connected to the outlet side of the receiver. Connecting the outlet side of the first regulation valve to the outlet side of the receiver allows a very stable operation of the refrigeration circuit with only small fluctuations.
  • outlet side of the first regulation valve is fluidly connected to the inlet side of the receiver. Connecting the outlet side of the first regulation valve to the inlet side of the receiver provides an alternative embodiment of the refrigeration circuit in which the refrigerant delivered from the first regulation valve may be collected within the receiver.
  • the first regulation valve is a three-way regulation valve, which is configured for controlling the flow of refrigerant flowing through the refrigeration circuit side of the at least one heat recovery heat exchanger and for controlling the flow of refrigerant from/to the receiver. This allows to simultaneously control the flow of refrigerant flowing through the refrigeration circuit side of the at least one heat recovery heat exchanger and the flow of refrigerant flowing from/to the receiver with a single valve.
  • the use of a three-way regulation valve reduces the complexity and the manufacturing costs of the refrigeration circuit.
  • the heat recovery system comprises at least one fluid pump which is configured to pump a heat receiving fluid through the heat recovery system side of the heat recovery heat exchanger. This supports the flow of the heat receiving fluid through the heat recovery heat exchanger and enhances the transfer of heat from the refrigerant circulating within the refrigeration circuit to the heat receiving fluid.
  • An embodiment comprises a control unit which is configured for controlling at least the regulation valve. This allows to control the amount of heat transferred to the heat receiving fluid by controlling the at least one regulation valve.
  • An embodiment comprises a control unit which is configured for controlling the operation of the at least one compressor. This allows to control the refrigeration capacity of the refrigeration circuit in operation.
  • the control unit may be provided by a single control unit or by a couple of (sub-)control units, each of the (sub-)control units being designated to a specific task or a group of specific tasks.
  • a first (sub-)control unit may by designated to control the refrigeration circuit while a second (sub-)control unit is designated to control the heat recovery system.
  • the (sub-)control units may be connected to each other in order to exchange signals coordinating their operation.
  • An embodiment comprises at least one refrigerant temperature sensor which is configured to measure the temperature of the refrigerant circulating within the refrigeration circuit. This allows to control the refrigeration circuit and the regulation valve based on the temperature of the refrigerant circulating within the refrigeration circuit.
  • An embodiment comprises at least one refrigeration pressure sensor which is configured to measure the pressure of the refrigerant flowing through the refrigeration circuit allowing to control the operation of the refrigeration circuit based on the measured pressure of the refrigerant circulating within the refrigeration circuit.
  • a fluid temperature sensor which is configured to measure the temperature of the heat receiving fluid circulating through the heat recovery system side of the heat recovery heat exchanger is provided allowing to control the operation of the refrigeration circuit based on the measured temperature of the heat receiving fluid flowing through the heat recovery system side of the heat recovery heat exchanger.
  • the regulation valve is switched to the position by which the heat exchange in the heat recovery heat exchanger meets the required heat demand, and then remaining heat, if present, is transferred to the environment by one or more of the heat rejecting heat exchangers.
  • the heat demand in the heat recovery system is always met, and the heat rejecting heat exchanger(s) only have to be operated if there is remaining heat that is not utilized by the heat recovery system.
  • the method of operating a refrigeration circuit comprises to control the regulation valve in dependency of the heat demand on the heat recovery system side of the heat recovery heat exchanger in order to transfer exactly the demanded amount of heat to the heat recovery system.
  • the regulation valve is controlled depending on the temperature and/or the pressure of the refrigerant circulating within the refrigeration circuit in order to optimize the amount of heat transferred to the heat recovery system.
  • the method includes to control the flow of fluid through the heat rejecting heat exchanger in order to adjust the cooling capacity of the refrigeration circuit.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Air Conditioning Control Device (AREA)

Claims (14)

  1. Circuit de réfrigération faisant circuler un fluide frigorigène et comprenant dans le sens d'écoulement du fluide frigorigène :
    au moins un compresseur (4a, 4b, 4c) ;
    au moins un échangeur de chaleur à rejet de chaleur (6, 6a, 6b) ;
    un récepteur (7) ;
    au moins un dispositif de détente (8) ; et
    au moins un évaporateur (10) ;
    le circuit de réfrigération comprenant en outre :
    au moins un échangeur de chaleur à récupération de chaleur (12) ayant un côté circuit de réfrigération (12a) et un côté système de récupération de chaleur (12b) et étant configuré pour le transfert de chaleur entre le côté circuit de réfrigération (12a) et le côté système de récupération de chaleur (12b), dans lequel le côté circuit de réfrigération (12a) est raccordé de manière fluidique entre le côté sortie de l'au moins un compresseur (4a, 4b, 4c) et une conduite de sortie de récepteur (11) pour faire s'écouler le fluide frigorigène en circulation à travers le côté circuit de réfrigération (12a) ; et
    au moins une vanne de régulation (16), qui peut être commutée entre une position ouverte, dans laquelle la vanne de régulation (16) est complètement ouverte ;
    une position fermée, dans laquelle la vanne de régulation (16) est complètement fermée ; et
    au moins une position intermédiaire, dans laquelle la vanne de régulation (16) est partiellement ouverte ;
    dans lequel la vanne de régulation (16) est une vanne à trois voies (32) qui est agencée entre le récepteur (7) et le dispositif de détente (8) et raccordée de manière fluidique au côté sortie de l'au moins un côté circuit de réfrigération (12a) de l'échangeur de chaleur à récupération de chaleur (12) pour commander l'écoulement de fluide frigorigène s'écoulant à travers le côté circuit de réfrigération (12a) et pour commander l'écoulement de fluide frigorigène du récepteur (7) vers le dispositif de détente (8) .
  2. Circuit de réfrigération selon la revendication 1, dans lequel la vanne de régulation (16) peut être commutée entre la position ouverte, la position fermée et l'au moins une position intermédiaire en fonction de la demande de chaleur du côté système de récupération de chaleur (12b) de l'échangeur de chaleur à récupération de chaleur (12), dans lequel la vanne de régulation (16) comprend en particulier une pluralité de positions intermédiaires différentes, ou dans lequel le degré d'ouverture de la vanne de régulation (16) est continuellement variable entre la position ouverte et la position fermée.
  3. Circuit de réfrigération selon l'une quelconque des revendications précédentes, comprenant au moins deux échangeurs de chaleur à rejet de chaleur (6a, 6b) ou parties d'échangeur de chaleur à rejet de chaleur (6a, 6b), dans lequel les au moins deux échangeurs de chaleur à rejet de chaleur (6a, 6b) ou parties d'échangeur de chaleur à rejet de chaleur (6a, 6b) ont en particulier des capacités différentes.
  4. Circuit de réfrigération selon l'une quelconque des revendications précédentes, comprenant en outre au moins une vanne commutable (5a, 5b) qui est configurée pour commander l'écoulement de fluide frigorigène s'écoulant à travers un échangeur de chaleur à rejet de chaleur associé (6, 6a, 6b) ou une partie d'échangeur de chaleur à rejet de chaleur (6, 6a, 6b), dans lequel une vanne commutable (5a, 5b) est en particulier associée à chacun des échangeurs de chaleur à rejet de chaleur (6, 6a, 6b) ou à chacune des parties d'échangeur de chaleur à rejet de chaleur (6, 6a, 6b).
  5. Circuit de réfrigération selon la revendication 4, dans lequel au moins une vanne commutable (5a, 5b, 30) peut être commutée entre un état complètement ouvert et un état complètement fermé, et/ou dans lequel au moins une vanne commutable (5a, 5b) est une vanne à tournant sphérique actionnée par moteur.
  6. Circuit de réfrigération selon l'une quelconque des revendications 4 à 5, comprenant en outre une unité de commande (22, 22a, 22b) qui est configurée pour commander l'au moins une vanne commutable (5a, 5b).
  7. Circuit de réfrigération selon l'une quelconque des revendications précédentes, dans lequel le côté sortie de la vanne de régulation (16) est raccordé de manière fluidique au côté sortie du récepteur (7).
  8. Circuit de réfrigération selon l'une quelconque des revendications précédentes, comprenant en outre une pompe à fluide (20) qui est configurée pour pomper un fluide de réception de chaleur à travers le côté système de récupération de chaleur (12b) de l'échangeur de chaleur à récupération de chaleur (12), et une unité de commande (22, 22a, 22b) qui est configurée pour commander la pompe à fluide (20).
  9. Circuit de réfrigération selon l'une quelconque des revendications précédentes, comprenant en outre une unité de commande (22, 22a, 22b) qui est configurée pour commander l'au moins une vanne de régulation (16) et/ou l'au moins un compresseur (4a, 4b, 4c).
  10. Circuit de réfrigération selon l'une quelconque des revendications précédentes, comprenant en outre au moins l'un d'un capteur de température de fluide frigorigène (24) qui est configuré pour mesurer la température du fluide frigorigène en circulation dans le circuit de réfrigération, d'un capteur de pression de fluide frigorigène (26) qui est configuré pour mesurer la pression du fluide frigorigène en circulation dans le circuit de réfrigération, et d'un capteur de température de fluide (28) qui est configuré pour mesurer la température du fluide de réception de chaleur s'écoulant à travers le côté système de récupération de chaleur (12b) de l'échangeur de chaleur à récupération de chaleur (12).
  11. Procédé de fonctionnement d'un circuit de réfrigération avec un fluide frigorigène en circulation et comprenant dans le sens d'écoulement du fluide frigorigène :
    au moins un compresseur (4a, 4b, 4c) ;
    au moins un échangeur de chaleur à rejet de chaleur (6a, 6b) ;
    un récepteur (7) ;
    au moins un dispositif de détente (8) ; et
    au moins un évaporateur (10) ;
    le circuit de réfrigération comprenant en outre au moins un échangeur de chaleur à récupération de chaleur (12) comprenant un côté circuit de réfrigération (12a) et un côté système de récupération de chaleur (12b) et étant configuré pour transférer de la chaleur du fluide frigorigène en circulation vers un système de récupération de chaleur (14),
    dans lequel le côté circuit de réfrigération (12a) est raccordé entre le côté sortie de l'au moins un compresseur (4a, 4b, 4c) et une conduite de sortie de récepteur (11) pour faire s'écouler le fluide frigorigène à travers le côté circuit de réfrigération (12a) ; et
    une vanne de régulation (16) qui est une vanne à trois voies (32) qui est agencée entre le récepteur (7) et le dispositif de détente (8) et raccordée de manière fluidique au côté sortie de l'au moins un côté circuit de réfrigération (12a) de l'échangeur de chaleur à récupération de chaleur (12) pour commander l'écoulement de fluide frigorigène s'écoulant à travers le côté circuit de réfrigération (12a) et pour commander l'écoulement de fluide frigorigène du récepteur (7) vers le dispositif de détente (8) ;
    dans lequel le procédé comprend l'étape de régulation de l'écoulement de fluide frigorigène s'écoulant à travers le côté circuit de réfrigération (12a) de l'échangeur de chaleur à récupération de chaleur (12) en commandant la vanne de régulation (16) afin qu'elle soit commutée entre
    une position ouverte, dans laquelle la vanne de régulation (16) est complètement ouverte ;
    une position fermée, dans laquelle la vanne de régulation (16) est complètement fermée ; et
    au moins une position intermédiaire, dans laquelle la vanne de régulation (16) est partiellement ouverte.
  12. Procédé selon la revendication 11, dans lequel la vanne de régulation (16) est commandée en fonction de la demande de chaleur du côté système de récupération de chaleur (12b) de l'échangeur de chaleur à récupération de chaleur (12) et/ou en fonction de la température et/ou de la pression du fluide frigorigène en circulation dans le circuit de réfrigération.
  13. Procédé selon la revendication 11 ou 12, dans lequel, dans un premier temps, la vanne de régulation (16) est commutée vers la position dans laquelle l'échange de chaleur dans l'échangeur de chaleur à récupération de chaleur (12) répond à la demande de chaleur requise, puis la chaleur restante, le cas échéant, est transférée dans l'environnement par un ou plusieurs des échangeurs de chaleur à rejet de chaleur (6a, 6b).
  14. Procédé selon l'une quelconque des revendications 12 à 13, dans lequel le procédé inclut la commande de l'écoulement de fluide à travers l'échangeur de chaleur à rejet de chaleur (6, 6a, 6b).
EP12710975.9A 2011-09-02 2012-03-29 Circuit de réfrigération et procédé de réfrigération assurant une récupération de la chaleur Active EP2751500B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12710975.9A EP2751500B1 (fr) 2011-09-02 2012-03-29 Circuit de réfrigération et procédé de réfrigération assurant une récupération de la chaleur

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
PCT/EP2011/065196 WO2013029687A1 (fr) 2011-09-02 2011-09-02 Système de réfrigération et procédé de réfrigération réalisant une récupération de la chaleur
PCT/EP2012/055686 WO2013029808A1 (fr) 2011-09-02 2012-03-29 Circuit de réfrigération et procédé de réfrigération assurant une récupération de la chaleur
EP12710975.9A EP2751500B1 (fr) 2011-09-02 2012-03-29 Circuit de réfrigération et procédé de réfrigération assurant une récupération de la chaleur

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EP2751500A1 EP2751500A1 (fr) 2014-07-09
EP2751500B1 true EP2751500B1 (fr) 2019-08-28

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DE102019210575A1 (de) * 2019-07-17 2021-01-21 Vitesco Technologies GmbH Thermomanagementsystem, Fahrzeug und Verfahren zum Betreiben zweier Kühlkreisläufe eines Thermomanagementsystems
DE102019210576A1 (de) * 2019-07-17 2021-01-21 Vitesco Technologies GmbH Thermomanagementsystem, Fahrzeug und Verfahren zum Betreiben zweier Kühlkreisläufe eines Thermomanagementsystems
FR3131952B1 (fr) 2022-01-14 2024-06-28 Grtgaz Dispositif et procédé de réchauffement puis détente d’un gaz

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