EP4224093A1 - Dispositif de réfrigération - Google Patents

Dispositif de réfrigération Download PDF

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Publication number
EP4224093A1
EP4224093A1 EP22155366.2A EP22155366A EP4224093A1 EP 4224093 A1 EP4224093 A1 EP 4224093A1 EP 22155366 A EP22155366 A EP 22155366A EP 4224093 A1 EP4224093 A1 EP 4224093A1
Authority
EP
European Patent Office
Prior art keywords
side heat
refrigeration device
valve
utilization side
refrigerant
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
EP22155366.2A
Other languages
German (de)
English (en)
Inventor
Hideo Chikami
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.)
Daikin Europe NV
Original Assignee
Daikin Europe NV
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 Daikin Europe NV filed Critical Daikin Europe NV
Priority to EP22155366.2A priority Critical patent/EP4224093A1/fr
Priority to PCT/EP2023/052936 priority patent/WO2023148396A1/fr
Publication of EP4224093A1 publication Critical patent/EP4224093A1/fr
Pending legal-status Critical Current

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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
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/003—Indoor unit with water as a heat sink or heat source
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0232—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with bypasses
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
    • F25B2313/02334—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements during heating
    • 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
    • F25B2400/19—Pumping down refrigerant from one part of the cycle to another part of the cycle, e.g. when the cycle is changed from cooling to heating, or before a defrost cycle is started
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/18—Optimization, e.g. high integration of refrigeration components
    • 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
    • F25B2600/2515—Flow 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2519—On-off valves

Definitions

  • the present invention relates to a refrigeration device, preferably a heat pump type air conditioning and hot water supplying device, that is capable of simultaneously providing an air conditioning load and a hot water load.
  • refrigeration devices that comprise a compressor, a plurality of utilization side heat exchangers, an expansion mechanism and a heat source side heat exchanger, which are fluidly connected in series to constitute a refrigeration circuit, are known in the prior art.
  • Such refrigeration circuits enable to provide cooling or heating depending on the direction in which a refrigerant is flown through such a refrigerant circuit.
  • refrigeration devices are configured to provide air conditioning and hot water at the same time. That is, such refrigeration devices comprise a plurality of utilization side heat exchangers, wherein at least one of said utilization side heat exchangers is configured to generate, for example, hot water when the refrigerant circuit is used in a heating mode.
  • at least one further utilization side heat exchanger of the plurality of utilization side heat exchangers is configured to provide air conditioning.
  • air conditioning can be heating when the refrigerant circuit is used in a heating mode or cooling when the refrigerant circuit is used in a cooling mode.
  • Such refrigeration devices that are capable of providing domestic hot water and/or domestic heating, when the refrigerant circuit is used in a heating mode, are also known as heat pump type air conditioning and hot water supplying devices and are oftentimes abbreviated as DHW-DX combined systems.
  • such combined systems can be understood as combined air conditioning and hot water supply systems that are capable of simultaneously providing an air conditioning load and a hot water load.
  • An example for such a previously known refrigeration device is derivable from EP 2 653 805 A1 .
  • a known DHW-DX combined system is described, which is capable of providing domestic hot water and air conditioning with warm air at the same time, but also enables to use the refrigerant in the refrigerant circuit, for example, only for air conditioning or for producing hot water when the refrigeration device of EP 2 653 805 A1 is used in a heating mode.
  • a plurality of utilization side heat exchangers for example, in the form of a plurality of air conditioning indoor units in several rooms to be airconditioned, can be provided. In such a configuration, situations may arise, wherein not all of the air conditioning indoor units are operated.
  • branches of the refrigerant circuit that are not in operation constrain unused refrigerant in it and it may occur that a large amount of refrigerant is "stuck" in non-operated branches of the refrigerant circuit.
  • branches of the refrigerant circuit that are not in operation constrain unused refrigerant in it and it may occur that a large amount of refrigerant is "stuck" in non-operated branches of the refrigerant circuit.
  • branches of the refrigerant circuit that are not in operation constrain unused refrigerant in it and it may occur that a large amount of refrigerant is "stuck" in non-operated branches of the refrigerant circuit.
  • the constrained and pressurized refrigerant may be heated up by an electrical heater that is usually additionally provided in such a hot water supply unit.
  • the heated constrained and pressurized refrigerant will cause unnecessary stress on the piping and may cause damage of said piping from time to time.
  • a refrigeration device comprises a compressor, a plurality of utilization side heat exchangers, an expansion mechanism and a heat source side heat exchanger fluidly connected in series to constitute a refrigerant circuit.
  • the refrigeration device comprises a first refrigerant pipe, which extends from the compressor to a first utilization side heat exchanger of the plurality of utilization side heat exchangers, and which comprises a first valve configured to at least fully open and fully close the first refrigerant pipe.
  • the refrigeration device furthermore comprises a second refrigerant pipe, which extends from the compressor to a second utilization side heat exchanger of the plurality of utilization side heat exchangers, and which comprises a second valve configured to at least fully open and fully close the second refrigeration pipe.
  • the refrigeration device comprises a controller, which is configured to fully close the first valve when the operation of the first utilization side heat exchanger is stopped and/or which is configured to fully close the second valve when the operation of the second utilization side heat exchanger is stopped.
  • the refrigeration device also comprises a first bypass pipe extending from a downstream side of the first valve when the refrigeration device is used in a heating mode to a suction side of the compressor and a second bypass pipe extending from a downstream side of the second valve when the refrigeration device is used in a heating mode to a suction side of the compressor.
  • first bypass pipe and the second bypass pipe each, i.e. respectively, comprise pressure-reducing means configured to reduce the pressure of a refrigerant in the first bypass pipe and the second bypass pipe.
  • first refrigerant pipe and the second refrigerant pipe as well as the first bypass pipe and the second bypass pipe are also to be understood as pipings that form part of the refrigerant circuit.
  • first valve and the “second valve” are to be understood as valves that are able to block and open the first refrigerant pipe and the second refrigerant pipe.
  • first bypass pipe and the second bypass pipe each comprising pressure-reducing means enables that a connection between a low pressure side and a high pressure side after the first and second valve can be established through the pressure-reducing means.
  • the respective bypass pipes and pressure reducing means provided therein enable that constrained and unused refrigerant can be sucked back to the compressor, where it can be reused for ongoing operations, for example, a heating operation of water.
  • unused refrigerant sucked out of the shut-off branches of the refrigerant circuit can contribute to a heating (or a cooling) effect and ensure that the largest amount of refrigerant possible is used to provide efficient heating (or cooling). Even further, it is possible to ensure a lower electricity consumption due to a better availability of the refrigerant. This increases the overall efficiency of the refrigeration device
  • the present invention enables to achieve a mediated recovery and reuse of refrigerant due to the provision of the first bypass pipe and the second bypass pipe each comprising pressure-reducing means.
  • the presence of the pressure-reducing means in the refrigeration device does not only enable refrigerant recovery and reuse but is also particularly beneficial for security reasons because the safety issue caused by pressurized piping damage can be resolved.
  • the first and second valves are solenoid valves.
  • valves can switch from a fully closed to a fully open state.
  • first and second valves may be motor operated valves. This enables to allow and establish a vast variety of valve settings and a more flexible control of refrigerant flows through the refrigerant circuit.
  • the first and second refrigerant pipes extend in parallel from the compressor via a branching pipe arranged on the downstream side of the compressor.
  • the opened/closed states of the first refrigerant pipe and second refrigerant pipe can be controlled separately by the first valve and the second valve.
  • the expansion mechanism comprises a first expansion valve arranged downstream of the first utilization side heat exchanger, when the refrigeration device is used in a heating mode. Further, the expansion mechanism comprises a second expansion valve arranged downstream of the second utilization side heat exchanger, when the refrigeration device is used in a heating mode.
  • Such an expansion mechanism comprising a first and a second expansion valve respectively arranged downstream of the respective utilization side heat exchangers enables that the refrigerant pipes of the utilization side heat exchangers cannot only be shut off on an upstream side of the utilization side heat exchangers, but also on a downstream side thereof.
  • both sides of the piping directed to and away from the respective utilization side heat exchangers can be opened and closed. Accordingly, branches of the refrigerant circuit containing an utilization side heat exchanger arranged thereon can be fully closed and opened.
  • the whole branch containing, for example, the first utilization side heat exchanger is shut off from the remaining refrigerant circuit.
  • the refrigerant that is constrained in said shut-off part of the refrigerant circuit stemming from the first valve via the first utilization side heat exchanger to the first expansion valve can be sucked back through the first bypass pipe and can accordingly be recovered and reused in the remaining operated refrigerant circuit.
  • the shut-off section can be emptied, and no pressured refrigerant is constrained therein.
  • the controller is configured to fully close the first valve and the first expansion valve when the operation of the first utilization side heat exchanger is stopped and/or is configured to fully close the second valve and the second expansion valve when the operation of the second utilization side heat exchanger is stopped.
  • one control step enables to simultaneously close the relevant valves downstream and upstream of the respective utilization side heat exchangers and, therefore, enables to efficiently shut-off or re-open the respective refrigerant pipings.
  • such a configuration furthermore enables that refrigerant constrained and stuck in shut off parts of the refrigerant circuit can be automatically sucked through the pressure-reducing means by the operation of the compressor and be reused in the remaining operated refrigerant circuit.
  • a plurality second utilization side heat exchangers is arranged in parallel downstream of the second valve in the second refrigerant pipe downstream of the second valve in the second refrigerant pipe.
  • such second utilization side heat exchangers can be provided for air conditioning a space, in which said second utilization side heat exchangers are provided.
  • Such a configuration enables that, for example, several rooms of a house, in which the refrigeration device is provided, can respectively be provided with a utilization side heat exchanger.
  • the second utilization heat exchangers do not require that all the second utilization side heat exchangers are of the same model or type of utilization side heat exchangers.
  • utilization side heat exchangers can be air conditioners or radiators that can be arranged in parallel in the refrigerant circuit, for example, in different rooms or positions of a room.
  • the expansion mechanism comprises the first expansion valve arranged downstream of the first utilization side heat exchanger.
  • the expansion mechanism comprises a single second expansion valve arranged downstream of and connected to the second utilization side heat exchangers, or the expansion mechanism comprises a plurality of second expansion valves arranged downstream of and respectively connected to the second utilization side heat exchangers.
  • the first expansion valve enables to completely close the stream directed to the first utilization side heat exchanger. Accordingly, when the first expansion valve and the first valve are closed, constrained refrigerant that is stuck in said refrigerant piping that is not an operation can be recovered via the pressure-reducing means in the first bypass pipe and efficiently used in other operated parts of the refrigerant circuit.
  • a configuration of having one single second expansion valve arranged downstream of and connected to the second utilization heat exchangers enables to achieve a simple configuration of a refrigerant circuit in which all pipings downstream of the second utilization side heat exchangers can be shut off by one single expansion valve.
  • the provision of a plurality of second expansion valves arranged downstream of and respectively connected to the second utilization side heat exchangers enables an individual opening and closing of a refrigerant piping downstream of the respective utilization side heat exchangers.
  • Such a configuration enables that individual second utilization side heat exchangers can be operated, whereas other second utilization side heat exchangers are not operated, and the refrigerant stuck in said parts of the refrigerant circuit is easily recovered.
  • the controller is configured to fully close the second valve and the second expansion valve or the second expansion valves when the operation of the second utilization side heat exchangers is stopped.
  • the pressure-reducing means is a capillary.
  • Having a capillary as a pressure-reducing means enables that the refrigerant flow must not be regulated by an active element, such that a simple configuration of a refrigerant circuit can be achieved that efficiently uses the refrigerant in the refrigerant circuit.
  • a capillary as a pressure-reducing means also enables to regulate the pressure reduction by the natural restriction of a small cross section area and the corresponding length of the capillary.
  • the refrigerant flow and the pressure reduction can be moderated by the physical parameters of a piping cross section of the capillary in the bypass pipe and the corresponding length of the capillary.
  • such a configuration enables a simple, reliable, and cost-efficient solution without any moving parts or active elements that could be damaged or malfunctioning from time to time. Furthermore, no additional control device or the like is required.
  • the pressure-reducing means is a motor operated valve.
  • this enables to achieve a more flexible system which can also react to changes in the refrigerant circuit, particularly if new utilization side heat exchangers or the like are brought into the refrigerant circuit, or if some elements of the refrigeration device, particularly utilization side heat exchangers, are taken out of the system.
  • the first utilization side heat exchanger is a hot water supply unit. More preferably, the hot water supply unit can be a coil in a water tank.
  • Said hot water supply unit is for producing domestic hot water when the refrigeration device is used in a heating mode.
  • the more preferred embodiment of the coil in the water tank enables that refrigerant can flow through the coil of the first utilization side heat exchanger and exchange heat with water inside the tank such that the water, when the refrigeration device is used in a heating mode, gets heated up by the refrigerant flowing through said coil. Hence domestic hot water can be efficiently produced.
  • an electrical heater is additionally provided in such a hot water supply unit.
  • the second utilization side heat exchanger is an air conditioning indoor unit or a radiator for heating a space in which the second utilization side heat exchanger is positioned when the refrigeration device is used in a heating mode and/or for cooling the space in which the second utilization side heat exchanger is positioned when the refrigeration device is used in a cooling mode.
  • providing, for example, a plurality of such air conditioning indoor units enables that several rooms can be provided with several air conditioning indoor units and the heating or cooling in said rooms can be adjusted individually.
  • a system enables to achieve a system which has different temperatures in different spaces.
  • the refrigeration device further comprises an accumulator arranged upstream of the compressor in the refrigerant circuit.
  • the first bypass pipe extends from the downstream side of the first valve, when the refrigeration device is used in the heating mode, to a suction side of the accumulator
  • the second bypass pipe extends from the downstream side of the second valve, when the refrigeration device is used in the heating mode, to a suction side of the accumulator.
  • Such a configuration enables that, when refrigerant is sucked out of branches of the refrigerant circuit that are not operated, said refrigerant can first be accumulated before it enters the compressor. Accoringly, the operational reliability of the compressor can be increased, as no liquid refrigerant or the like is sucked into the compressor.
  • the first and second refrigerant pipes are gas pipes containing the refrigerant in at least partial gaseous state, when the refrigeration device is used in the heating mode.
  • the first and second refrigerant pipes are gas pipes containing the refrigerant in a fully gaseous state, when the refrigeration device is used in a heating mode.
  • Such configurations enable that, since the refrigerant is used in a at least partial (or fully) gaseous state, the efficiency of the system can be as high as possible, and a large amount of heat exchange can be achieved.
  • the refrigeration device further comprises a switching valve, preferably a four-way switching valve.
  • the switching valve is configured to switch the refrigerant circuit from the heating mode to the cooling mode.
  • Such a switching device may be provided, for example, on a downstream side of a compressor, such that the flow direction of a refrigerant leaving the compressor and having a high pressure can be controlled by said switching device.
  • the switching device decides on the direction in which the refrigerant flows through the refrigerant circuit.
  • the present invention relates to a refrigeration device, which enables to reuse refrigerant from parts of the refrigerant circuit that are not in operation in order to efficiently use the recycled refrigerant in ongoing operations in operated parts of the refrigerant circuit.
  • FIG. 1 A schematic illustration of a refrigeration device according to an embodiment of the present invention.
  • Fig. 1 shows a refrigeration device according to an embodiment of the present invention.
  • a refrigerant circuit is constituted by a compressor 1, a plurality of utilization side heat exchangers, which will be described in more detail below, an expansion mechanism 4 and a heat source side heat exchanger 5.
  • the compressor 1, the utilization side heat exchangers, the expansion mechanism 4 and the heat source side heat exchanger 5 are fluidly connected in series to constitute a refrigerant circuit.
  • a switching device 16 which is configured to switch the refrigerant circuit from a heating mode to a cooling mode is provided.
  • Fig. 1 shows a switching device 16 in the form of a four-way switching valve.
  • Fig. 1 also shows a configuration in which said switching device 16 is switched in such a manner that the refrigeration device is used in a heating mode. That is, the switching position of the switching device 16 enables that a pressurized refrigerant that leaves the compressor 1 subsequently flows to the plurality of utilization side heat exchangers to exchange heat, before it continues to stream to the expansion mechanism 4 in the refrigerant circuit.
  • heat is dispensed from the refrigerant to the surrounding environment, such as air or water (to be described later) in the utilization side heat exchangers.
  • the refrigerant When the refrigerant has flown through the utilization side heat exchangers, the refrigerant continues to stream to the expansion mechanism 4, when the refrigeration device is used in a heating mode. Said expansion mechanism 4 enables to reduce the pressure of the refrigerant, such that it then can continued to stream to the heat source side heat exchanger 5. Here, heat can once again be exchanged.
  • the heat source side heat exchanger 5 can, for example, be arranged in an outdoor unit.
  • the utilization side heat exchangers can be considered as indoor units.
  • the refrigerant then flows from the heat source side heat exchanger 5 back to the compressor 1.
  • Fig. 1 illustrates the provision of an accumulator 15, which is arranged intermittent between the heat source side heat exchanger 5 and the compressor 1 in the refrigeration circuit.
  • the accumulator 15 is arranged upstream of the compressor 1 in the refrigerant circuit. This accumulator 15 thus enables the refrigerant being streamed through the refrigerant circuit to be accumulated before it streams into the refrigeration circuit.
  • the refrigerant leaving the compressor 1 is in a gaseous state when the refrigeration device is used in the heating mode.
  • the switching device 16 changes the flow direction of the refrigerant through the refrigerant circuit.
  • the flow direction of the refrigerant through the refrigerant circuit is opposed, such that the refrigerant leaving the compressor 1 first streams through the heat source side heat exchanger 5, then through the expansion mechanism 4, and then through the utilization side heat exchangers before it returns back to the compressor 1.
  • a plurality of utilization side heat exchangers is provided.
  • a first utilization side heat exchanger 2 is provided in the refrigerant circuit.
  • said first utilization side heat exchanger 2 is a hot water supply unit in the form of a coil 13 in a water tank 14.
  • said hot water supply unit is an exemplary embodiment of the first utilization side heat exchanger 2 configured to produce domestic hot water when the refrigeration device is used in a heating mode (as illustrated in Fig. 1 ).
  • Fig. 1 it is also derivable from Fig. 1 that not only a first utilization side heat exchanger 2, but also a plurality of second utilization side heat exchangers 3.1, 3.2, 3.3 is provided in the refrigerant circuit.
  • a first utilization side heat exchanger 2 but also a plurality of second utilization side heat exchangers 3.1, 3.2, 3.3 is provided in the refrigerant circuit.
  • three second utilization side heat exchangers 3.1, 3.2, 3.3 are exemplarily provided. These three second utilization side heat exchangers 3.1, 3.2, 3.3 are arranged in parallel (see Fig. 1 ).
  • the three second utilization side heat exchangers 3.1, 3.2, 3.3 are illustrated as air conditioning indoor units for heating a space, in which the second utilization side heat exchangers 3.1, 3.2, 3.3 are positioned, when the refrigeration device is used in a heating mode.
  • said air conditioning indoor units 3.1, 3.2, 3.3 may also be capable of cooling a space in which the second utilization side heat exchangers are respectively positioned, when the refrigeration device is used in a cooling mode.
  • one, more or all of the second utilization side heat exchangers 3.1, 3.2, 3.3 provided in the refrigerant circuit may also be configured as radiators for heating the space and/or for cooling the space in which the respective second utilization side heat exchangers 3.1, 3.2, 3.3 are arranged.
  • the second utilization side heat exchangers 3.1, 3.2, 3.3 do not have to be arranged in the same space to be heated and/or to be cooled, but they can also be arranged in different spaces, for example, in different rooms of a building in order to heat or cool different rooms of a building or to establish difference temperatures therein.
  • the configuration of the first utilization side heat exchanger 2 and the provision of at least one, here three, second utilization side heat exchangers 3.1, 3.2, 3.3 enables to achieve a so-called “combined system", which is commonly known as a domestic hot water and air conditioning combined system.
  • the first utilization side heat exchanger 2 and the plurality of second utilization side heat exchangers 3.1, 3.2, 3.3 are arranged in parallel.
  • a first refrigerant pipe 6 which extends from the compressor 1 to the first utilization side heat exchanger 2, here subsequently in the form of the hot water supply units, is provided.
  • Said first refrigerant pipe 6 comprises a first valve 7.
  • Said first valve 7 divides said first refrigerant pipe 6 in a section on a upstream side 6.1 of the first valve 7, when the refrigeration device is used in a heating mode, and in a section on a downstream side 6.2 of the first valve 7, when the refrigeration device is used in a heating mode.
  • Said first valve 7 is configured to at least fully open and fully close the first refrigerant pipe 6.
  • a second refrigerant pipe 8 is provided, which extends from the compressor 1 to the second utilization side heat exchangers 3.1, 3.2, 3.3.
  • Said second refrigerant pipe 8 comprises a second valve 9.
  • the second refrigerant pipe 8 is divided in an upstream side 8.1 of the second valve 9 and a downstream side 8.2 of the second valve 9. Similar to the first valve 7, also the second valve 9 is configured to at least fully open and fully close the second refrigerant pipe 8.
  • the first valve 7 and second valve 9 are configured as solenoid valves, which are configured to at least fully open and fully close the first refrigerant pipe 6 and the second refrigerant pipe 8.
  • the first valve 7 and second valve 9 may be configured as motor operated valves. In this case, they are configured to adjust the amount of refrigerant flowing in the first refrigerant pipe 6 and the second refrigerant pipe 8.
  • the refrigeration device as illustrated in Fig. 1 enables a parallel production of domestic hot water and warm air for heating up a space.
  • the first utilization side heat exchanger 2 and the second utilization side heat exchangers 3.1, 3.2, 3.3 are arranged in parallel.
  • the first refrigerant pipe 6 and the second refrigerant pipe 8 extend in parallel from the compressor 1 via a branching pipe 17 arranged on a downstream side of the compressor 1. That is, the branching pipe 17 enables to stream refrigerant leaving the compressor 1 to both of the first refrigerant pipe 6 and the second refrigerant pipe 8 in order to deliver refrigerant to the first utilization side heat exchanger 2 and the three second utilization side heat exchangers 3.1, 3.2, 3.3 in the exemplary form of air conditioning indoor units.
  • the three air conditioning indoor units as an exemplary form of the second utilization side heat exchangers 3.1, 3.2, 3.3, are arranged on a downstream side 8.2 of the second valve 9 in the second refrigerant pipe 8.
  • the first refrigerant pipe 6 and the second refrigerant pipe 8 are gas pipes containing the refrigerant in at least partial gaseous state.
  • the embodiment of the refrigeration device as illustrated in Fig. 1 further comprises a first bypass pipe 10, which extends from a downstream side 6.2 of the first valve 7 when the refrigeration device is used in a heating mode to a suction side of the compressor 1.
  • a first bypass pipe 10 does not extend directly to the compressor 1, but rather extends from the downstream side 6.2 of the first valve 7 to a suction side of the accumulator 15.
  • a second bypass pipe 11 extending from a downstream side 8.2 of the second valve 9, when the refrigeration device is used in a heating mode, to a suction side of the compressor 1 is provided.
  • the second bypass pipe 11 does not directly extend to a suction side of the compressor 1, as the accumulator 15 is intermittent thereto.
  • the second bypass pipe 11 extends in the illustrated exemplary embodiment of Fig. 1 from the downstream side 8.2 of the second valve 9 to a suction side of the accumulator 15.
  • Fig. 1 illustrates that the first bypass pipe 10 and the second bypass pipe 11 each comprise pressure-reducing means 12, which are configured to reduce the pressure of a refrigerant in the first bypass pipe 10 and the second bypass pipe 11.
  • the pressure-reducing means 12 can, for example, be a capillary.
  • the pressure of the refrigerant flowing through the first bypass pipe 10 and the second bypass pipe 11 can be gradually reduced by said capillary without the need of further actuated means.
  • the pressure-reducing means 12 may also be provided with a motor operated valve (not illustrated) to adapt the level of pressure reduction in the respective bypass pipes.
  • the expansion mechanism 4 of the refrigeration device as illustrated in Fig. 1 comprises a first expansion valve 4.1 arranged downstream of the first utilization side heat exchanger 2.
  • the expansion mechanism 4 also comprises a plurality of second expansion valves 4.2, 4.3, 4.4 arranged downstream of and respectively connected to the second utilization side heat exchangers 3.1, 3.2, 3.3.
  • first utilization side heat exchanger 2 is provided with a first expansion valve 4.1 arranged on a downstream side thereof, but also each of the three illustrated air conditioning indoor units 3.1, 3.2, 3.3 is respectively provided with an own expansion valve 4.2, 4.3, 4.4.
  • a section between the first valve 7 and the first expansion valve 4.1 comprises the first utilization side heat exchanger 2 therebetween.
  • the first valve 7 and the first expansion valve 4.1 can control whether refrigerant is streaming through said branch of the refrigerant circuit or not - depending on whether the valves are open or not.
  • the parallel branch i.e. the second refrigerant pipe 8 is also configured with the second valve 9 on an upstream side of the second utilization side heat exchangers 3.1, 3.2, 3.3 and also comprises respective second expansion valves 4.2, 4.3, 4.4 on the respective sub-branches (see Fig. 1 ).
  • first refrigerant pipe 6 and the second refrigerant pipe 8 extend in parallel from the compressor 1 via the branching pipe 17 and can be open and closed via the first valve 7 and the first expansion valve 4.1 as well as via the second valve 9 and the second expansion valves 4.2, 4.3, 4.4.
  • the three air conditioning indoor units 3.1, 3.2, 3.3 also extend in parallel in said second refrigerant pipe 8.
  • a stream through the respective sub-branches of the second refrigerant pipe 8 of each of the second utilization side heat exchangers here in the form of air conditioning indoor units 3.1, 3.2, 3.3, can be controlled via the opening/closing state of the second expansion valves 4.2, 4.3, 4.4.
  • the refrigeration device also comprises a (non-illustrated) controller, which is configured to fully close the first valve 7 when the operation of the first utilization side heat exchanger 2, i.e. the hot water supply unit, is or shall be stopped and/or which is configured to fully close the second valve 9, when the operation of the second utilization side heat exchangers 3.1, 3.2, 3.3 is or shall be stopped.
  • a (non-illustrated) controller which is configured to fully close the first valve 7 when the operation of the first utilization side heat exchanger 2, i.e. the hot water supply unit, is or shall be stopped and/or which is configured to fully close the second valve 9, when the operation of the second utilization side heat exchangers 3.1, 3.2, 3.3 is or shall be stopped.
  • the controller is also configured to fully close the first expansion valve 4.1 at the same time when the operation of the first utilization side heat exchanger 2 is or shall be stopped, and is additionally also configured to close the second expansion valves 4.2, 4.3, 4.4, when the operation of one, two or all of the three illustrated second utilization side heat exchangers 3.1, 3.2, 3.3 is or shall be stopped.
  • the controller can control the refrigerant flow to one of the air conditioning indoor units, to more than one of the air conditioning indoor units or all of the air conditioning indoor units and to the hot water supply device (as an exemplary embodiment of the first utilization side heat exchanger 2) depending on a switching status of the first valve 7, the second valve 9 and each of the first to fourth expansion valve 4.1, 4.2, 4.3, 4.4.
  • the controller enables to achieve different opening and closing states of each of the provided valves, such as the first valve 7, the second valve 9, the first expansion valve 4.1 and the three second expansion valves 4.2, 4.3, 4.4 arranged on a downstream side of the three second utilization side heat exchangers 3.1, 3.2, 3.3.
  • the controller when, for example, no production of hot water via the hot water supply unit (as the first utilization side heat exchanger 2) is required, the controller is configured to close the first valve 7 as well as the first expansion valve 4.1 of the expansion mechanism 4. Accordingly, the branch extending from the first valve 7 to the first expansion valve 4.1 can be fully shut off from the remaining refrigerant circuit via the controller.
  • the controller is also configured to shut off the refrigerant flow through said second utilization side heat exchangers 3.1, 3.2, 3.3.
  • the controller can close the second valve 9 and all of the three illustrated second expansion valves 4.2, 4.3, 4.4 when no air conditioning indoor unit is needed at all.
  • the controller is configured to open the second valve 9 and is furthermore configured to close only the amount of second expansion valves 4.2, 4.3, 4.4 that are arranged downstream of air conditioning indoor units 3.1, 3.2, 3.3 that shall not be operated.
  • the controller when only domestic hot water shall be produced, i.e. when none of the air conditioning indoor units is required to be operated, the controller is configured to close the second valve 9 and all of the three second expansion valves 4.2, 4.3, 4.4. Consequently, no refrigerant is passing through the second refrigerant pipe 8 after the second valve 9. Accordingly, solely the first refrigerant pipe 6 is operated in such a heating mode for producing domestic hot water only.
  • the controller closes the second valve 9 and the second expansion valves 4.2, 4.3, 4.4, such that no refrigerant is circulating through the second utilization side heat exchangers 3.1, 3.2, 3.3.
  • the refrigerant accordingly flows from the compressor 1 through the switching valve 16, through the branching pipe 17 to the first refrigerant pipe 6, passes the first valve 7 and then flows through the first utilization side heat exchanger 2, such that hot water is produced. After heat has been exchanged with the refrigerant in the first utilization side heat exchanger 2 to heat up the water, the refrigerant then continues to flow through the first expansion valve 4.1 and to the heat source side heat exchanger 5 before it continues to flow through the accumulator 15 and back to the compressor 1.
  • the closed second valve 9 in conjunction with the provided second bypass pipe 11 thereby enables that a suction force through said second bypass pipe 11 is produced.
  • said suction force enables that the refrigerant constrained in said blocked pipes of the refrigerant circuit (downstream of the second valve 9 and upstream of the first expansion valves 4.2, 4.3, 4.4), can be recovered and be flown through the capillary.
  • the refrigerant can be recovered from unused piping and additionally be used for a stream through the first utilization side heat exchanger 2 to efficiently produce domestic hot water.
  • the first valve 7 can be closed together with the first expansion valve 4.1.
  • refrigerant is then merely circulating through (at least one of) the second utilization side heat exchangers 3.1, 3.2, 3.3 and the second refrigerant pipe 8.
  • first bypass pipe 10 which extends from the downstream side 6.2 of first valve 7, when the refrigeration device is used in a heating mode, to a suction side of the compressor 1, here the accumulator 15, the constrained refrigerant that does not take part in any heat exchange in such a control state can be recovered.
  • the refrigerant that is stuck in non-operated branches of the refrigerant circuit can easily be reused for heat exchange in operated branches of the refrigerant circuit of the refrigeration device to achieve efficient heat exchange.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
EP22155366.2A 2022-02-07 2022-02-07 Dispositif de réfrigération Pending EP4224093A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP22155366.2A EP4224093A1 (fr) 2022-02-07 2022-02-07 Dispositif de réfrigération
PCT/EP2023/052936 WO2023148396A1 (fr) 2022-02-07 2023-02-07 Dispositif de réfrigération

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22155366.2A EP4224093A1 (fr) 2022-02-07 2022-02-07 Dispositif de réfrigération

Publications (1)

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EP4224093A1 true EP4224093A1 (fr) 2023-08-09

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EP (1) EP4224093A1 (fr)
WO (1) WO2023148396A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10141796A (ja) * 1996-11-07 1998-05-29 Daikin Ind Ltd ヒートポンプシステム
EP2402687A1 (fr) * 2009-02-24 2012-01-04 Daikin Industries, Ltd. Système de pompe à chaleur
US20130213072A1 (en) * 2010-12-15 2013-08-22 Mitsubishi Electric Corporation Combined air-conditioning and hot-water supply system
EP3299734A1 (fr) * 2016-09-23 2018-03-28 Daikin Industries, Limited Systeme de climatisation et d'alimentation en eau chaude

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10141796A (ja) * 1996-11-07 1998-05-29 Daikin Ind Ltd ヒートポンプシステム
EP2402687A1 (fr) * 2009-02-24 2012-01-04 Daikin Industries, Ltd. Système de pompe à chaleur
US20130213072A1 (en) * 2010-12-15 2013-08-22 Mitsubishi Electric Corporation Combined air-conditioning and hot-water supply system
EP2653805A1 (fr) 2010-12-15 2013-10-23 Mitsubishi Electric Corporation Système combiné de climatisation et de distribution d'eau chaude
EP3299734A1 (fr) * 2016-09-23 2018-03-28 Daikin Industries, Limited Systeme de climatisation et d'alimentation en eau chaude

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