WO2023248923A1 - Appareil de congélation - Google Patents

Appareil de congélation Download PDF

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Publication number
WO2023248923A1
WO2023248923A1 PCT/JP2023/022264 JP2023022264W WO2023248923A1 WO 2023248923 A1 WO2023248923 A1 WO 2023248923A1 JP 2023022264 W JP2023022264 W JP 2023022264W WO 2023248923 A1 WO2023248923 A1 WO 2023248923A1
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Prior art keywords
working medium
heat exchanger
indoor
circuit
outdoor
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PCT/JP2023/022264
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English (en)
Japanese (ja)
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雅也 本間
晃司 佐藤
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パナソニックＩｐマネジメント株式会社
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Publication of WO2023248923A1 publication Critical patent/WO2023248923A1/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
    • F25B1/00—Compression machines, plants or systems with non-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
    • 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 present invention relates to a refrigeration system that uses a refrigeration cycle working medium containing fluoroolefins, and particularly relates to a refrigeration system that can effectively avoid the effects of disproportionation reactions of fluoroolefins.
  • the working medium for the refrigeration cycle usually consists of a refrigerant and refrigeration oil (lubricating oil stored in a hermetic compressor).
  • HCFC hydrofluorocarbon
  • ODP ozone depletion potential
  • a typical example is difluoromethane (HFC32, R32).
  • HFC which is stable as a refrigeration cycle working medium (working medium)
  • GWP global warming potential
  • fluoroolefins with lower GWP particularly hydrofluoroolefins (HFO).
  • HFO1123 1,1,2-trifluoroethylene (HFO1123) is known as an HFO that has a low GWP, high cooling capacity, and performance close to R32, which is currently widely used.
  • Patent Document 1 As a refrigeration device using a fluoroolefin such as HFO1123, the one disclosed in Patent Document 1 has been proposed, for example.
  • the refrigeration device disclosed in Patent Document 1 has a binary cycle of a heat source heat medium circuit and a load heat medium circuit, and at least one of the heat source heat medium and load heat medium used in these circuits contains HFO1123. It is a refrigerant.
  • the heat source heat medium circuit includes a cascade heat exchanger that exchanges heat between the heat source heat medium and the load heat medium.
  • the heat source heat medium circuit is installed in the outdoor space, and the load heat exchanger in the load heat medium circuit is installed in the indoor space. Therefore, the cascade heat exchanger included in the heat source heat medium circuit is installed in the outdoor space.
  • a low GWP of a fluoroolefin means that its atmospheric lifetime is short. In other words, fluoroolefins are easily chemically decomposed and have low stability. Therefore, it is also known that a self-polymerization reaction called a disproportionation reaction (hereinafter referred to as a disproportionation reaction) is likely to occur in fluoroolefins such as HFO1123.
  • the disproportionation reaction is likely to occur due to high pressure or heat generated during use of the working medium for the refrigeration cycle. Furthermore, it is known that the disproportionation reaction occurs in a chain reaction because the disproportionation reaction is accompanied by a large release of heat. As a result, large amounts of soot may be generated, reducing the reliability of the refrigeration cycle system.
  • any working medium heat source heat medium and load heat medium in the binary cycle of the heat source heat medium circuit and the load heat medium circuit
  • the structure allows use of HFO1123.
  • fluoroolefins such as HFO1123 cause a disproportionation reaction, nor does it give any consideration to the effects on the heat source heat medium circuit and the load heat medium circuit when the disproportionation reaction occurs. .
  • the present invention has been made to solve these problems, and is aimed at reducing the amount of fluoroolefins in a refrigeration system that uses fluoroolefins as a working medium and has a dual cycle of an indoor circuit and an outdoor circuit. Even if an equalization reaction occurs, it is possible to avoid the possibility of its influence reaching indoors.
  • a refrigeration apparatus includes a first heat exchanger, a second heat exchanger, a compressor, and an expansion mechanism, and includes the first heat exchanger, the compressor, and the expansion mechanism.
  • the expansion mechanism is installed outdoors and connected to first piping that circulates the first working medium therein to form an outdoor circuit, and the second heat exchanger is installed indoors, and It is connected to a second pipe that circulates the second working medium to the second heat exchanger to constitute an indoor circuit, and is provided between the first pipe and the second pipe, and is connected to the second pipe that circulates the second working medium to the second heat exchanger.
  • the second working medium circulating in the indoor circuit does not contain a fluoroolefin that may cause a disproportionation reaction
  • the first working medium circulating in the outdoor circuit does not contain fluoroolefin.
  • a secondary heat exchanger that enables heat exchange between the indoor circuit and the outdoor circuit is installed outdoors. As a result, even if a disproportionation reaction occurs in the fluoroolefin in the outdoor circuit and the secondary heat exchanger is affected, the effect of this situation can be limited to the outdoor equipment. Therefore, it is possible to effectively avoid the possibility that the influence of the disproportionation reaction will be exerted on the room.
  • FIG. 1 is a schematic circuit diagram showing a typical configuration example of a refrigeration system according to an embodiment of the present invention.
  • FIG. 2 is a schematic circuit diagram showing a typical configuration example of a refrigeration device according to Embodiment 2 of the present disclosure.
  • FIG. 3 is a schematic circuit diagram showing a typical configuration example of a refrigeration device according to Embodiment 3 of the present disclosure.
  • a refrigeration apparatus includes a first heat exchanger, a second heat exchanger, a compressor, and an expansion mechanism, and the first heat exchanger, the compressor, and the expansion mechanism are installed outdoors.
  • the second heat exchanger is installed indoors, and is connected to a first pipe that circulates the first working medium therethrough to form an outdoor circuit. It is connected to a second piping that circulates to the exchanger to constitute an indoor circuit, and is provided between the first piping and the second piping, and provides mutual communication between the first working medium and the second working medium.
  • the method further includes a secondary heat exchanger for exchanging heat with, the secondary heat exchanger being installed outdoors, the first working medium containing at least fluoroolefins, and the second working medium containing no fluoroolefins. It is the composition.
  • the second working medium circulating in the indoor circuit does not contain a fluoroolefin that may cause a disproportionation reaction
  • the first working medium circulating in the outdoor circuit does not contain fluoroolefin.
  • a secondary heat exchanger that enables heat exchange between the indoor circuit and the outdoor circuit is installed outdoors. As a result, even if a disproportionation reaction occurs in the fluoroolefin in the outdoor circuit and the secondary heat exchanger is affected, the effect of this situation can be limited to the outdoor equipment. Therefore, it is possible to effectively avoid the possibility that the influence of the disproportionation reaction will be exerted on the room.
  • the refrigeration system having the above configuration further includes a bypass pipe including a shutoff valve connected in parallel to the secondary heat exchanger in the first pipe, and the bypass pipe is installed outdoors. There may be.
  • the indoor circuit includes a pump that pumps the second working medium to the second heat exchanger, and a pump that pumps the second working medium into the secondary heat exchanger.
  • the pump may include an indoor inflow cutoff valve that shuts off the flow of the second working medium, and the pump may be configured to stop when the indoor inflow cutoff valve blocks the inflow of the second working medium.
  • the indoor circuit further includes a gas-liquid separator connected to the second pipe and installed outdoors, and the gas-liquid separator is configured to maintain a predetermined pressure. It may also be configured to include a safety valve that releases gas.
  • the indoor circuit may further include an indoor outflow cutoff valve provided on the outflow side of the gas-liquid separator.
  • the refrigeration system having the above configuration further includes a controller and a first working medium temperature measuring device that measures the temperature of the first working medium flowing in the first pipe, and the controller
  • the structure may be such that when the first working medium temperature measuring device reaches a predetermined temperature, the shutoff valve provided in the bypass pipe is opened.
  • the refrigeration system having the above configuration further includes a controller and a first working medium temperature measuring device that measures the temperature of the first working medium flowing in the first pipe, and
  • the circuit further includes an outdoor flow cutoff valve that blocks inflow and outflow of the first working medium to the secondary heat exchanger, and the controller controls the first working medium temperature measuring device to reach a predetermined temperature. When the threshold is reached, the outdoor side circulation cutoff valve may be closed and the operation of the outdoor side circuit may be stopped.
  • the secondary heat exchanger may be configured to be any one of a plate heat exchanger, a double tube heat exchanger, and a shell and tube heat exchanger.
  • the first working medium may be a mixed refrigerant containing propane in addition to the fluoroolefin.
  • the first working medium may further contain a disproportionation inhibitor.
  • the second working medium may be a liquid refrigerant or a low-pressure refrigerant.
  • the refrigeration apparatus R1 shown in FIG. 1 is a typical configuration example of the first embodiment, and the refrigeration apparatus R1 is configured as an air conditioner. As shown in FIG. 1, the refrigeration system R1 according to the first embodiment includes an outdoor circuit 10 and an indoor circuit 20.
  • the outdoor circuit 10 includes a first pipe 11, a compressor 12, a first heat exchanger 13, a first blower 14, an expansion valve 15, a four-way valve 16, a secondary heat It is equipped with an exchanger 30, etc.
  • the indoor circuit 20 includes a second pipe 21, a pump 22, a second heat exchanger 23, a second blower 24, a secondary heat It is equipped with an exchanger 30, etc. Therefore, the secondary heat exchanger 30 is included in both the outdoor circuit 10 and the indoor circuit 20.
  • the compressor 12, the secondary heat exchanger 30, the expansion valve 15, and the first heat exchanger 13 are connected in series by the first piping 11 so that they circulate in this order via the four-way valve 16. This constitutes one refrigeration cycle.
  • a first working medium containing at least fluoroolefin circulates in the outdoor circuit 10.
  • the fluoroolefin contained in the first working medium is, for example, 1,1,2-trifluoroethylene (HFO1123), but is not particularly limited.
  • the first working medium may be a single refrigerant containing only HFO1123, or may be a mixed refrigerant containing other refrigerant components in addition to HFO1123. Details of the first working medium will be described later.
  • the compressor 12 compresses the first working medium.
  • the first heat exchanger 13 performs heat exchange between the first working medium and outdoor air (outside air).
  • the first blower 14 blows outdoor air to the first heat exchanger 13 .
  • the expansion valve 15 is an expansion mechanism that expands the first working medium.
  • the discharge side and suction side of the compressor 12 are each connected to a four-way valve 16.
  • the four-way valve 16 changes the flow direction of the first working medium by switching the four-way valve 16. If the discharge side of the compressor 12 is switched to the direction of the first heat exchanger 13, cooling operation is performed, and if the discharge side of the compressor 12 is switched to the direction of the secondary heat exchanger 30, heating operation is performed. The cooling operation and heating operation will be described later.
  • FIG. 1 the flow direction of the first working medium during cooling operation is illustrated by a black block arrow F1
  • the flow direction of the first working medium during heating operation is illustrated by a white block arrow F2.
  • a pump 22, a secondary heat exchanger 30, and a second heat exchanger 23 are connected in series through a second pipe 21 so as to circulate in this order, thereby forming one refrigeration cycle.
  • the thick dotted line shown in FIG. 1 is a boundary line that separates the indoor side and the outdoor side, and as shown in FIG. 1, only the second heat exchanger 23 of the indoor circuit 20 is installed on the indoor side.
  • the pump 22 and the secondary heat exchanger 30 are installed outside the room.
  • the pump 22 may be installed indoors.
  • all the outdoor circuits 10 are installed on the outdoor side.
  • a second working medium that does not contain fluoroolefins circulates in the indoor circuit 20 .
  • the composition of the second working medium is not particularly limited as long as it does not contain fluoroolefins.
  • a known liquid refrigerant or low-pressure refrigerant can be suitably used as the second working medium.
  • carbon dioxide (CO 2 ) is used as the second working medium.
  • water, brine mainly composed of water, antifreeze, etc. can also be used. Details of the second working medium will also be described later.
  • the pump 22 pumps the second working medium through the second pipe 21.
  • the second heat exchanger 23 performs heat exchange between the second working medium and indoor air.
  • the second blower 24 blows indoor air to the second heat exchanger 23.
  • the indoor circuit 20 does not include a configuration such as the four-way valve 16 in the outdoor circuit 10. Therefore, in the indoor circuit 20, the second working medium circulates in only one direction.
  • the flow direction of the second working medium is illustrated by a black block arrow F3.
  • the secondary heat exchanger 30 is included in each of the outdoor circuit 10 and the indoor circuit 20.
  • the secondary heat exchanger 30 performs heat exchange between the first working medium that circulates through the outdoor circuit 10 and the second working medium that circulates through the indoor circuit 20. Therefore, it can be said that the outdoor circuit 10 and the indoor circuit 20 are thermally connected via the secondary heat exchanger 30.
  • the refrigeration system R1 is configured as a binary cycle through the secondary heat exchanger 30, and the secondary heat exchanger 30 is configured to have a first working medium and a second working medium. Heat exchange takes place between the two.
  • the outdoor circuit 10 and the indoor circuit 20, which are independent refrigeration cycles, can be controlled in cooperation as one refrigeration system R1.
  • a compressor 12, a first heat exchanger 13, a first air blower 14, an expansion valve 15, a four-way valve 16, a pump 22, a second heat exchanger 23, and a second air blower 24 that constitute the refrigeration apparatus R1 are described.
  • the specific configuration of the secondary heat exchanger 30 is not particularly limited, and those known in the field of refrigeration equipment R1 can be suitably used.
  • a known hermetic refrigerant compressor can be suitably used as the compressor 12.
  • the hermetic refrigerant compressor may be of any type, such as a reciprocating type, a rotary type, a scroll type, or a screw type.
  • the electric element of the refrigerant compressor may have the same configuration as a known motor, and may be an outer rotor type motor or an inner rotor type motor.
  • first heat exchanger 13 Since the first heat exchanger 13 is an "outdoor” heat exchanger, it can be considered as a "condenser” of a general refrigeration system. Similarly, since the second heat exchanger 23 is an “indoor” heat exchanger, it can be considered as an "evaporator” of a general refrigeration system. Therefore, as the first heat exchanger 13, a heat exchanger known as a condenser can be used, and as the second heat exchanger 23, a heat exchanger known as an evaporator can be used. Examples of such a heat exchanger include, but are not particularly limited to, a plate heat exchanger, a double tube heat exchanger, a shell and tube heat exchanger, and the like.
  • the secondary heat exchanger 30 does not exchange heat between the working medium and air (outdoor air or indoor air) like the first heat exchanger 13 or the second heat exchanger 23; Since heat exchange is performed between one working medium and a second working medium, the type of heat exchanger may be selected depending on the types of the first working medium and the second working medium.
  • the first working medium is a refrigerant containing fluoroolefin
  • the second working medium is also a general refrigerant mainly containing hydrofluorocarbon
  • a plate heat exchanger may be used. Can be done.
  • the second working medium is a liquid refrigerant such as water, brine, antifreeze, etc.
  • a shell and tube heat exchanger can be used.
  • a shell-and-tube heat exchanger has a structure in which a large number of inner tubes are arranged inside an outer tube (shell) that serves as the body, and a second working medium of liquid refrigerant is passed through the inner tubes to absorb fluoroolefin.
  • the contained first working medium can be passed through the outer tube.
  • the expansion valve 15 may be a thermostatic expansion valve, an electronic expansion valve, or other expansion mechanism.
  • the four-way valve 16 the pump 22, the first blower 14, the second blower 24, etc., various known configurations can be suitably used.
  • the outdoor circuit 10 the high-temperature, high-pressure first working medium compressed by the compressor 12 is sent to the first heat exchanger 13 via the four-way valve 16 (in the direction of arrow F1).
  • the first heat exchanger 13 heat exchange is performed with the outdoor air (outside air) blown by the first blower 14, so that the first working medium becomes a high-pressure and medium-temperature liquid, and the expansion valve 15 will be sent to.
  • the first working medium is expanded by the expansion valve 15 to become a low-pressure, low-temperature gas-liquid mixture and is sent to the secondary heat exchanger 30.
  • the secondary heat exchanger 30 heat is exchanged between the first working medium and the second working medium in the indoor circuit 20 , and the gas is turned into a low-pressure medium-low temperature gas, which is then passed through the four-way valve 16 to the compressor 12 . Inhaled to the suction side.
  • the second working medium is pumped by the pump 22 and sent to the secondary heat exchanger 30 (in the direction of arrow F3).
  • the secondary heat exchanger 30 As described above, heat exchange is performed between the first working medium and the second working medium, so the second working medium is cooled by the low temperature and low pressure first working medium, and the second working medium is cooled indoors. It is sent to the second heat exchanger 23 installed.
  • heat exchange is performed with the indoor air blown by the second blower 24, so that the indoor air is cooled by the second working medium, thereby cooling the room.
  • the high-temperature, high-pressure first working medium compressed by the compressor 12 is sent to the secondary heat exchanger 30 via the four-way valve 16 (in the direction of arrow F2).
  • the secondary heat exchanger 30 heat exchange is performed between the first working medium and the second working medium of the indoor circuit 20, so that the first working medium becomes a high-pressure medium-low temperature liquid, and the expansion valve 15 will be sent to.
  • the first working medium is expanded by the expansion valve 15 to become a gas-liquid mixture at a low temperature and low pressure, and is sent to the first heat exchanger 13.
  • heat exchange is performed with the outdoor air blown by the first blower 14 , so that the first working medium becomes a low-pressure medium-low temperature gas, which is then drawn into the compressor 12 . Inhaled to the side.
  • the second working medium is pumped by the pump 22 and sent to the secondary heat exchanger 30.
  • the secondary heat exchanger 30 as described above, heat exchange is performed between the first working medium and the second working medium, so the second working medium is heated by the high temperature and high pressure first working medium, and the second working medium is heated indoors. It is sent to the second heat exchanger 23 installed.
  • heat exchange is performed with the indoor air blown by the second blower 24, so that the indoor air is heated by the second working medium, thereby heating the room.
  • a fluoroolefin with a smaller GWP for example, in the first embodiment, HFO1123 is used as described above.
  • fluoroolefins include those having low GWP, high cooling capacity, and performance close to R32, which is currently widely used.
  • fluoroolefins are susceptible to disproportionation reactions. Since this disproportionation reaction is accompanied by large heat release, there is a risk that the disproportionation reaction will proceed in a chain reaction.
  • a refrigerant containing fluoroolefin is used as the first working medium that circulates through the outdoor circuit 10
  • a refrigerant that does not contain fluoroolefin is used as the second working medium that circulates through the indoor circuit 20.
  • a secondary heat exchanger 30 that enables heat exchange between the outdoor circuit 10 and the indoor circuit 20 is installed outdoors.
  • a mixed refrigerant containing propane in addition to fluoroolefin can be used as the first working medium.
  • Propane not only has good physical properties as a working medium for refrigeration cycles, but also has the effect of suppressing the disproportionation reaction of the fluoroolefins when used in combination with the fluoroolefins. Therefore, if the first working medium containing fluoroolefins is a mixed refrigerant that further contains propane, it is possible to achieve good refrigerating capacity while suppressing the disproportionation reaction of fluoroolefins. .
  • the first working medium may further contain a disproportionation inhibitor in addition to the fluoroolefin.
  • a disproportionation inhibitor in addition to the fluoroolefin.
  • propane becomes the second refrigerant component
  • the first working medium contains a disproportionation inhibitor as a component other than these refrigerant components. Good too. Thereby, the occurrence of the disproportionation reaction of fluoroolefins can be suppressed even better.
  • the first working medium contains fluoroolefins, it is necessary to take measures to prevent the disproportionation reaction of fluoroolefins in the outdoor circuit 10 where the first working medium circulates.
  • propane a disproportionation inhibitor, or both, the possibility of a disproportionation reaction occurring in the outdoor circuit 10 can be more effectively suppressed or substantially prevented.
  • the first working medium may contain other refrigerant components other than propane, as described later.
  • a liquid refrigerant (brine) or a low-pressure refrigerant can also be used.
  • the first working medium is a fluorocarbon-based gas refrigerant containing fluoroolefins
  • the second working medium is a liquid refrigerant or a low-pressure refrigerant that is not covered by the Japanese High Pressure Gas Safety Act.
  • the first working medium used in the outdoor circuit 10 may contain at least fluoroolefin (fluoroalkene) as a refrigerant component.
  • fluoroolefin fluoroalkene
  • the specific type of fluoroolefin is not particularly limited, but for example, 1,1,2-trifluoroethylene (HFO1123), trans-1,2-difluoroethylene (HFO1132(E)), cis-1,2-difluoroethylene Fluoroethylene such as ethylene (HFO1132 (Z)), 1,1-difluoroethylene (HFO1132a), tetrafluoroethylene (FO1114, TFE), monofluoroethylene (HFO1141); 1,2,3,3,3-pentafluoro Propene (HFO-1225ye), 2,3,3,3-tetrafluoropropene (HFO-1234yf), 1,3,3,3-tetrafluoropropene (HFO-1234ze), 1,2,3,3-tetra Examples
  • fluoroolefins Only one type of these fluoroolefins may be used as a refrigerant component, or two or more types may be appropriately combined and used as a refrigerant component.
  • fluoroethylene can be suitably used as a refrigerant component, and among these fluoroethylenes, 1,1,2-trifluoroethylene (HFO1123) can be particularly suitably used.
  • the first working medium may contain a refrigerant other than fluoroolefins as a refrigerant component.
  • a refrigerant component such as propane. Therefore, a mixed refrigerant of fluoroolefin and propane can be used as the first working medium.
  • the first working medium may contain "other refrigerant components" other than fluoroolefins and propane. Typical other refrigerants include, but are not particularly limited to, hydrofluorocarbons (HFC), saturated hydrocarbons other than propane, carbon dioxide, and the like.
  • HFC hydrofluorocarbons
  • HFC include fluoromethanes such as difluoromethane (R32) and trifluoromethane (R23); fluoroethane (R161), 1,1-difluoroethane (R152a), and 1,1,1-trifluoroethane.
  • Fluorocarbons such as ethane (R143a), 1,1,2,2-tetrafluoroethane (R134), 1,1,1,2-tetrafluoroethane (R134a), pentafluoroethane (R125), difluoroethane, trifluoroethane, etc.
  • saturated hydrocarbons include ethane, n-propane, cyclopropane, n-butane, cyclobutane, isobutane (2-methylpropane), methylcyclopropane, n-pentane, and isopentane (2-methylbutane). , neopentane (2,2-dimethylpropane), methylcyclobutane, and the like.
  • saturated hydrocarbons include those that can be used as disproportionation inhibitors. Therefore, saturated hydrocarbons can be used in conjunction with other refrigerant components and as disproportionation inhibitors.
  • the first working medium contains a fluoroolefin, and it is known that fluoroolefins cause a disproportionation reaction. Therefore, the first working medium may contain a disproportionation inhibitor that suppresses the disproportionation reaction of fluoroolefins.
  • Specific disproportionation inhibitors are not particularly limited, but include, for example, saturated hydrocarbons having 2 to 5 carbon atoms (excluding propane), or halogen atoms having 1 to 4 carbon atoms. Examples include haloalkanes, except when all are fluorine.
  • a saturated hydrocarbon used as a disproportionation inhibitor will be referred to as a "disproportionation inhibiting alkane”
  • a haloalkane used as a disproportionation inhibitor will be referred to as a “disproportionation inhibiting haloalkane”.
  • the disproportionation inhibiting alkane used as the disproportionation inhibitor in the present disclosure may be any saturated hydrocarbon (alkane) having 2 to 5 carbon atoms, and specifically, ethane, cyclopropane, n -butane, cyclobutane, isobutane (2-methylpropane), methylcyclopropane, n-pentane, isopentane (2-methylbutane), neopentane (2,2-dimethylpropane), methylcyclobutane, and the like. Only one type of these saturated hydrocarbons may be used, or two or more types may be used in an appropriate combination.
  • All of these saturated hydrocarbons are gases at room temperature (the boiling points of n-pentane and methylcyclobutane are the highest at approximately 36°C, and the boiling points of other hydrocarbons are less than 36°C), and are the refrigerant components of the first working medium.
  • propane which is a saturated hydrocarbon having 3 carbon atoms, can suppress the disproportionation reaction of fluoroolefins.
  • propane is not included in the "disproportionation-suppressing alkane" because, as described above, propane is a refrigerant component that can be used together with the fluoroolefins as the first working medium.
  • propane since cyclic cyclopropane is different from linear propane (n-propane), which is a refrigerant component, it can be used as a disproportionation-suppressing alkane.
  • saturated hydrocarbons having one carbon number ie, methane
  • GWP global warming potential
  • cyclopentane has a boiling point of 49° C. and is liquid at room temperature, and in the present disclosure, it can be used as a disproportionation inhibitor.
  • the disproportionation-inhibiting haloalkane used as the disproportionation inhibitor in the present disclosure may have any one of 1 to 4 carbon atoms, excluding cases where all halogen atoms are fluorine. More specifically, halomethane (halogenated methane) with 1 carbon number, haloethane (halogenated ethane) with 2 carbon atoms, halopropane (halogenated propane) with 3 carbon atoms, and halobutane (halogenated butane) with 4 carbon atoms. etc. can be mentioned.
  • any one of halomethane, haloethane, halopropane, or halobutane may be used, but two or more of these disproportionation-suppressing haloalkanes may be appropriately selected and used in combination.
  • halobutane may have a linear structure or a branched structure (ie, a structure having the same carbon skeleton as isobutane or 2-methylpropane).
  • the disproportionation-suppressed haloalkane may be one having the structure of formula (1) shown below.
  • X in formula (1) is a halogen atom selected from the group consisting of fluorine (F), chlorine (Cl), bromine (Br), and iodine (I), and p is either 1 or 2.
  • F fluorine
  • Cl chlorine
  • Br bromine
  • I iodine
  • p is either 1 or 2.
  • q is an integer of 0 or more
  • r is an integer of 1 or more
  • the sum of q and r is 2p+2
  • X is the same or different type of halogen atom.
  • disproportionation-suppressed haloalkanes shown in formula (1) above those in which X is composed only of F are excluded. This is because the disproportionation-suppressing haloalkane in which X is only F is a compound that can be used in combination with other refrigerant components, and does not substantially function as a disproportionation inhibitor.
  • the halogen atom X may be at least one of F, Cl, Br, and I, as described above, but it is preferably at least I;
  • the disproportionation-suppressing haloalkane shown in formula (1) contains Cl and/or Br, the ozone layer depletion potential (ODP) tends to be high, so there may be restrictions on availability or handling. In addition, regardless of the type of halogen atom included.
  • the disproportionation-suppressing haloalkane added to the first working medium as a disproportionation inhibitor can effectively suppress the disproportionation reaction of fluoroolefins even in a relatively small amount. It is possible to slow down the rapid progress of the disproportionation reaction. Furthermore, even when the disproportionation suppressing haloalkane is used in combination with other disproportionation inhibitors such as disproportionation suppressing alkanes, the total amount of the disproportionation inhibitor added is the total amount of the first working medium. is sufficiently small compared to . Therefore, even if a haloalkane with a relatively large ODP or GWP is used as a disproportionation-suppressing haloalkane, it will not have a significant impact on the environment.
  • the disproportionation-suppressing haloalkane represented by formula (1) is not particularly limited, but specifically, for example, (mono)iodomethane (CH 3 I ), diiodomethane (CH 2 I 2 ), dibromomethane (CH 2 Br 2 ).
  • bromomethane CH 3 Br
  • dichloromethane CH 2 Cl 2
  • chloroiodomethane CH 2 ClI
  • dibromochloromethane CHBr 2 Cl
  • tetraiodide methane CI 4
  • carbon tetrabromide CBr 4
  • bromotrichloromethane CBrCl 3
  • dibromodichloromethane CBr 2 Cl 2
  • tribromofluoromethane CBr 3 F
  • fluorodiiodomethane CHFI 2
  • difluorodiiodomethane CF 2 I 2
  • dibromo Halomethanes such as difluoromethane (CBr 2 F 2 ), trifluoroiodomethane (CF 3 I), difluoroiodomethane (CHF 2 I); 1,1,1-trifluoro-2-iodoethane (CF 3 CH 2 I) , mono
  • disproportionation-suppressing haloalkanes may be used alone or in an appropriate combination of two or more.
  • diiodomethane CH 2 I 2
  • difluorodiiodomethane CF 2 I 2
  • trifluoroiodomethane CF 3 I
  • difluoroiodomethane selected from the group consisting of methane (CHF 2 I), 1-bromo-2-iodotetrafluoroethane (CF 2 BrCF 2 I), 1,1,1-trifluoro-2-iodoethane (CF 3 CH 2 I); At least one of these can be particularly preferably used.
  • the first working medium is a refrigerant containing at least a fluoroolefin (fluoroalkene), and may contain, for example, propane (R290) or other refrigerant components as necessary. , and may further contain a disproportionation inhibitor.
  • the content (content rate) of fluoroolefins and propane or the content (content rate) of a disproportionation inhibitor are not particularly limited.
  • the content of fluoroolefins may be 50% by mass or more, may be 60% by mass or more, or may be 70% by mass or more. It may be 80% by mass or more.
  • the first working medium is a mixed refrigerant containing propane
  • the content of propane may be less than 50% by mass, and 40% by mass or less, when the total amount of the mixed refrigerant is 100% by mass.
  • the content may be 30% by mass or less, or may be 20% by mass or less.
  • the fluoroolefin is preferably 1,1,2-trifluoroethylene (HFO1123), but is not particularly limited.
  • the second working fluid used in the refrigeration device R1 may be any fluid as long as it does not contain fluoroolefins (fluoroalkenes) as a refrigerant component, unlike the first working fluid.
  • the second working medium does not need to be a fluorocarbon refrigerant like the first working medium, and may be, for example, a liquid refrigerant or a natural refrigerant other than a fluorocarbon refrigerant.
  • a gas refrigerant such as a fluorocarbon refrigerant
  • a low-pressure refrigerant that is not applicable to the Japanese High Pressure Gas Safety Act can be suitably used.
  • the second working medium is a fluorocarbon-based refrigerant
  • a refrigerant having a composition obtained by removing the fluoroolefin from the first working medium described above can be suitably used.
  • the second working medium is a natural refrigerant, ammonia, carbon dioxide (carbon dioxide gas), hydrocarbons, nitrogen, etc. can be suitably used.
  • Hydrocarbons may include the aforementioned propane or other saturated hydrocarbons.
  • the second working medium is a liquid refrigerant such as brine, a lower alcohol such as methanol or ethanol or an aqueous antifreeze containing this, a lower glycol such as ethylene glycol or propylene glycol or an aqueous antifreeze containing this, an aqueous calcium chloride solution, etc.
  • a liquid refrigerant such as brine
  • a lower alcohol such as methanol or ethanol or an aqueous antifreeze containing this
  • a lower glycol such as ethylene glycol or propylene glycol or an aqueous antifreeze containing this
  • an aqueous calcium chloride solution etc.
  • examples include aqueous solutions of inorganic salts.
  • the second working medium is either a liquid refrigerant or a low-pressure refrigerant that is not covered by the Japanese High Pressure Gas Safety Act. Any refrigerant is sufficient.
  • both the first working medium and the second working medium may contain additives or other components known in the field of refrigeration equipment or refrigeration cycles.
  • the first working medium compressed by the compressor 12 may contain refrigerating machine oil contained in the compressor 12 as a component of the first working medium.
  • Refrigeration apparatus R2 shown in FIG. 2 is a typical configuration example of the second embodiment. As shown in FIG. 2, like the refrigeration system R2 according to the first embodiment, the refrigeration system R2 according to the second embodiment includes an outdoor circuit 10 and an indoor circuit 20, and has a secondary heat exchanger. This configuration is thermally connected by a device 30.
  • the refrigeration system R2 according to the second embodiment has the same basic configuration as the refrigeration system R1 according to the first embodiment, and has a first working medium circulating in the outdoor circuit 10. , and the second working medium circulating in the indoor circuit 20 are also the same as in the first embodiment. Therefore, detailed explanations of the configurations in the refrigeration system R2 according to the second embodiment that are common to the refrigeration system R1 according to the first embodiment will be omitted.
  • the outdoor circuit 10 includes a cutoff valve 31 connected in parallel to the secondary heat exchanger 30 in the first pipe 11.
  • This embodiment differs from the first embodiment in that it further includes a bypass pipe 17.
  • the indoor circuit 20 is connected to the second pipe on the downstream side (direction of arrow F3) in the flow direction of the second working medium when viewed from the secondary heat exchanger 30, and has a safety valve.
  • This embodiment differs from the first embodiment in that a gas-liquid separator 25 having a gas-liquid separator 26 is provided.
  • cutoff valves are provided at positions upstream and downstream in the flow direction of the first working medium or the second working medium when viewed from the secondary heat exchanger 30. It is also different in that it has 32 to 35. Note that both the bypass pipe 17 and the gas-liquid separator 25 are installed outside the room, as shown in FIG.
  • a bypass pipe 17 included in the outdoor circuit 10 is connected to the first pipe 11 between the four-way valve 16 and the expansion valve 15 in parallel to the secondary heat exchanger 30. As described above, the bypass pipe 17 is connected to the first pipe 11 in parallel to the secondary heat exchanger 30.
  • the bypass piping 17 is provided with the bypass piping cutoff valve 31 as described above. Further, the first pipe 11 is provided with outdoor circulation cutoff valves 32 and 33 at positions sandwiching the secondary heat exchanger 30 therebetween.
  • One outdoor side flow cutoff valve 32 is located between the secondary heat exchanger 30 and the four-way valve 16.
  • the other outdoor side flow cutoff valve 33 is located between the secondary heat exchanger 30 and the expansion valve 15.
  • a first heat exchanger 13 is located between the four-way valve 16 and the expansion valve 15.
  • the compressor 12 is connected to the first pipe 11 via the four-way valve 16, and the flow direction of the first working medium is changed by switching the four-way valve 16. Be changed.
  • the first working medium compressed by the compressor 12 is sent to the first heat exchanger 13 via the four-way valve 16 (in the direction of arrow F1), so when viewed from the secondary heat exchanger 30, A first working medium flows in via the first heat exchanger 13 and the expansion valve 15 .
  • the first working medium compressed by the compressor 12 is sent to the secondary heat exchanger 30 via the four-way valve 16 (in the direction of arrow F2).
  • the outdoor circulation cutoff valve 32 serves as an inflow-side isolation valve
  • the outdoor circulation isolation valve 33 serves as an outflow-side isolation valve
  • the outdoor side circulation cutoff valve 32 serves as an outflow side cutoff valve. Therefore, in the second embodiment, the outdoor side flow cutoff valves 32 and 33 are positioned as valves that block the inflow and outflow of the first working medium to the secondary heat exchanger 30, and which valve is on the inflow side. Otherwise, it is not defined as the outflow side.
  • the bypass piping cutoff valve 31 is normally closed, and the outdoor side flow cutoff valves 32 and 33 are normally opened. Therefore, when the outdoor circuit 10 is operating normally, the first working medium flows through the secondary heat exchanger 30. On the other hand, if the bypass piping cutoff valve 31 is opened and the outdoor circulation cutoff valves 32 and 33 are closed, the first working medium bypasses the secondary heat exchanger 30 (secondary heat exchange (bypassing the container 30) and flows between the four-way valve 16 and the expansion valve 15.
  • bypass piping 17 is provided in the outdoor circuit 10 of the secondary heat exchanger 30 and the bypass piping 17 has the bypass piping cutoff valve 31, the It becomes possible to switch between circulating the first working medium containing the fluoroolefin or circulating the first working medium to the outdoor circuit 10 by bypassing the secondary heat exchanger 30. Thereby, even if a fluoroolefin disproportionation reaction occurs in the outdoor circuit 10, the influence on the secondary heat exchanger 30 can be further suppressed, and the influence on the room can also be more effectively avoided.
  • the outdoor circulation cutoff valves 32 and 33 that block the inflow and outflow of the first working medium to the secondary heat exchanger 30, when a fluoroolefin disproportionation reaction occurs in the outdoor circuit 10, The flow of the first working medium to the secondary heat exchanger 30 can be stopped. This further reduces the possibility that the influence of the disproportionation reaction will be exerted on the secondary heat exchanger 30, and further the possibility that the influence of the disproportionation reaction will be exerted on the indoor circuit 20 via the secondary heat exchanger 30. can be suppressed to
  • the opening and closing of the bypass piping cutoff valve 31 and the opening and closing of the outdoor circulation cutoff valves 32 and 33 may or may not be linked.
  • the bypass pipe cutoff valve 31 is opened and the outdoor circulation cutoff valves 32 and 33 are closed. It may also be linked to do so.
  • these shutoff valves 31 to 33 do not need to operate in conjunction with each other. .
  • the opening and closing of the outdoor circulation cutoff valves 32 and 33 may be linked.
  • shutoff valves 31 to 33 need to be operated in conjunction with each other. Instead, the outdoor side flow cutoff valves 32 and 33 may be closed. Alternatively, if you want to stop only the outflow of the first working medium from the secondary heat exchanger 30, or conversely, if you want to stop only the inflow of the first working medium into the secondary heat exchanger 30, There is no need for the flow cutoff valves 32 and 33 to operate in conjunction with each other.
  • the gas-liquid separator 25 included in the indoor circuit 20 is located on the downstream side in the flow direction of the second working medium when viewed from the secondary heat exchanger 30. Therefore, in the configuration shown in FIG. 2, the pump 22, the secondary heat exchanger 30, the gas-liquid separator 25, and the second heat exchanger 23 are connected to the second pipe 21 so as to circulate in this order. become.
  • the second pipe 21 is provided with an indoor inflow cutoff valve 34 on the second working medium inflow side (upstream side in the flow direction of the second working medium) when viewed from the secondary heat exchanger 30.
  • This indoor inflow cutoff valve 34 is normally open, but when it is closed, it is linked to the operation of the pump 22. That is, when the indoor inflow cutoff valve 34 closes and blocks the flow of the second working medium into the secondary heat exchanger 30, the pump 22 stops.
  • the second pipe 21 is provided with an indoor outflow cutoff valve 35 on the outflow side of the second working medium (downstream side in the flow direction of the second working medium) when viewed from the gas-liquid separator 25.
  • This indoor outflow cutoff valve 35 is also normally open.
  • the indoor circuit 20 includes the gas-liquid separator 25, even if the first working medium flows into the indoor circuit 20 in the secondary heat exchanger 30, the first working medium mixed with the second working medium The medium can be separated in a gas-liquid separator 25. Furthermore, since the gas-liquid separator 25 is provided outdoors, the safety valve 26 allows the first working medium that has flowed in to be discharged outdoors at a predetermined pressure. As a result, even if a disproportionation reaction occurs in the fluoroolefin in the outdoor circuit 10 and its influence affects the secondary heat exchanger 30, the possibility of the influence reaching the room is more effectively avoided. be able to.
  • the indoor outflow cutoff valve 35 on the outflow side of the second working medium when viewed from the gas-liquid separator 25, for example, the first working medium flows into the indoor circuit 20 in the secondary heat exchanger 30. Even if the first working medium flows into the gas-liquid separator 25 and reaches the gas-liquid separator 25, closing the indoor outflow cutoff valve 35 prevents the first working medium from flowing beyond the gas-liquid separator 25 into the indoor circuit 20. can do. Thereby, even if the influence of the disproportionation reaction extends from the secondary heat exchanger 30 to the gas-liquid separator 25, it is possible to more effectively avoid the possibility that the influence will extend into the room.
  • the indoor inflow cutoff valve 34 is provided on the inflow side of the second working medium when viewed from the secondary heat exchanger 30, even if a disproportionation reaction occurs in the fluoroolefins in the outdoor circuit 10, the indoor In the inner circuit 20, by closing the indoor inflow cutoff valve 34, the flow of the second working medium into the secondary heat exchanger 30 is stopped, and the operation of the pump 22 is also stopped as described above. Thereby, it is possible to further suppress the possibility that the influence of the disproportionation reaction will be exerted on the secondary heat exchanger 30, and it is also possible to more effectively avoid the possibility that the influence will be exerted indoors.
  • shutoff valves 31 to 35 are not particularly limited, and any control valve known in the field of refrigeration equipment can be suitably used.
  • a gate valve or a ball valve which has excellent on/off performance for fluids such as refrigerant, can be suitably used, but other known regulating valves may be used as necessary.
  • the specific configuration of the gas-liquid separator 25 is not particularly limited, and a known configuration can be suitably used.
  • a known configuration can be suitably used.
  • surface tension type and centrifugal type are known, and these types can be applied.
  • an oil separator type or a type using a tank referred to as "oil separator type" for convenience of explanation
  • Japanese Patent No. 6264688, Japanese Patent No. 6497582, Japanese Patent No. 6555584, etc. which are patent publications of previous Japanese patent applications by the present applicant, etc. Examples include the configuration described in . Note that the contents of these Japanese patent publications are incorporated by reference in this specification as part of the description of this specification.
  • Such an oil separator type gas-liquid separator 25 includes, for example, a tank that is a volumetric body having a predetermined volume of space inside, a gas pipe and an inlet pipe connected to the upper part of the tank, and a lower part of the tank. Equipped with outlet piping connected to.
  • the second working medium is a gas refrigerant and the first working medium (gas refrigerant) is mixed into the second working medium (gas refrigerant), the mixture is expanded by an expansion valve and one side
  • the refrigerant may be separated into a liquid refrigerant and a gas refrigerant by temporarily storing the refrigerant in a tank and adjusting the pressure within the tank.
  • a liquid pipe may be provided separately from the outlet pipe, for example. This liquid pipe is connected to an expansion valve, and by squeezing and expanding the liquid refrigerant with the expansion valve, it can be returned to the second pipe 21 as a gas refrigerant.
  • the control unit 40 also performs control in the refrigeration system R1 according to the first embodiment or the refrigeration system R2 according to the second embodiment, but in the third embodiment, control is performed using the detection result of the temperature sensor 41.
  • control unit 40 in FIG. 3, the control unit 40 is illustrated, and control signals are schematically illustrated using dotted line arrows.
  • the control unit 40 controls the operation of the refrigeration system R3 (the operation of the refrigeration system R1 according to the first embodiment or the refrigeration system R2 according to the second embodiment is similarly controlled by the control unit 40). Therefore, the control unit 40 also controls the compressor 12, the four-way valve 16, the pump 22, the first blower 14, the second blower 24, etc., but the control signals are not shown in FIG. 3.
  • the control unit 40 determines that the temperature of the first working medium measured (detected) by the temperature sensor 41 has reached a predetermined temperature
  • the control unit 40 controls the bypass piping 17. control to open the bypass piping cutoff valve 31 provided therein.
  • the outdoor flow cutoff valves 32 and 33 may be controlled to be opened in conjunction with the closing of the bypass piping cutoff valve 31.
  • the control unit 40 closes the outdoor circulation cutoff valves 32, 33 and closes the outdoor circulation circuit. 10 is controlled to stop operation. Thereby, it is possible to further suppress the possibility that the influence of the disproportionation reaction will reach the secondary heat exchanger 30, and it is also possible to suppress the chain reaction progression of the disproportionation reaction in the outdoor circuit 10. If the operation of the outdoor circuit 10 is stopped in this way, the outdoor circuit 10 does not necessarily have to include the bypass pipe 17.
  • control unit 40 controls the outdoor circulation cutoff valves 32 and 33 to be closed based on the measurement result of the temperature sensor 41, if it controls the bypass pipe cutoff valve 31 to open, the secondary There is no need to flow the first working medium through the heat exchanger 30. Therefore, the operation of the outdoor circuit 10 is continued by circulating the first working medium through the bypass piping 17, and when the measurement result of the temperature sensor 41 falls below a predetermined temperature, the outdoor circulation cutoff valves 32 and 33 are opened. may be controlled.
  • control unit 40 may continue the operation of the indoor circuit 20 even if the outdoor circulation cutoff valves 32 and 33 are closed to stop the operation of the outdoor circuit 10, based on the measurement result of the temperature sensor 41. You can. At this time, for example, the indoor side inflow cutoff valve 34 maintains an open state, the indoor side outflow cutoff valve 35 closes, and the first working medium (or asymmetric products generated by the chemical reaction) may be removed.
  • the specific configuration of the temperature sensor 41 is not particularly limited, and any temperature measuring device known in the field of refrigeration equipment can be used. Typical examples include a resistance temperature sensor, a thermocouple temperature sensor, a thermistor, etc., but there are no particular limitations.
  • the installation position of the temperature sensor 41 with respect to the first piping 11 is also not particularly limited, and may be any position that can satisfactorily measure the temperature of the first working medium. The location where the temperature of the medium can be measured (piping connected to the discharge side of the compressor 12) can be cited.
  • control unit 40 is also not particularly limited, and a known general configuration can be suitably adopted.
  • the control unit 40 is configured as hardware including various processors, integrated circuits (ICs) such as ASICs (Application Specific Integrated Circuits), FPGAs (Field Programmable Gate Arrays), and CPLDs (Complex Programmable Logic Devices). be done.
  • ICs integrated circuits
  • FPGAs Field Programmable Gate Arrays
  • CPLDs Complex Programmable Logic Devices
  • These hardware can also be said to be circuits that include active elements (transistors, etc.) and passive elements (capacitors, resistors, etc.).
  • the integrated circuit may include a memory, or may be provided with a memory such as volatile memory (RAM) or non-volatile memory (ROM) separately from the integrated circuit.
  • RAM volatile memory
  • ROM non-volatile memory
  • the indoor circuit includes a pump that pumps the second working medium to the second heat exchanger, and an indoor inflow that blocks the inflow of the second working medium to the secondary heat exchanger.
  • the refrigeration system according to technology 1 or technology 2 further comprising: a cutoff valve, and the pump stops when the indoor inflow cutoff valve cuts off the inflow of the second working medium.
  • the outdoor circuit further includes a controller and a first working medium temperature measuring device that measures the temperature of the first working medium flowing in the first pipe, and the outdoor circuit
  • the controller further includes an outdoor circulation cutoff valve that blocks inflow and outflow of the first working medium to the heat exchanger, and the controller controls the temperature of the first working medium to be controlled when the first working medium temperature measuring device reaches a predetermined temperature.
  • the refrigeration apparatus according to any one of techniques 2 to 5, wherein the outside circulation cutoff valve is closed and the operation of the outdoor circuit is stopped.
  • the secondary heat exchanger is any one of a plate heat exchanger, a double tube heat exchanger, and a shell and tube heat exchanger, according to any one of the techniques 1 to 7. Refrigeration equipment.
  • the present invention can be widely and suitably used in the field of refrigeration equipment, particularly in the field of refrigeration equipment that uses a working medium containing fluoroolefins in a refrigeration cycle including a compressor.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Air-Conditioning Systems (AREA)

Abstract

Selon l'invention, un premier échangeur de chaleur (13), un compresseur (12) et un détendeur (15) prévus sur un appareil de congélation (R1) sont disposés à l'extérieur et sont reliés à un premier tuyau (11) pour faire circuler un premier milieu de travail (circuit côté extérieur (10)). Un second échangeur de chaleur (23) prévu sur l'appareil de congélation (R1) est disposé à l'intérieur et est relié à un second tuyau (21) pour faire circuler un second milieu de travail vers le second échangeur de chaleur (circuit côté intérieur (20)). L'appareil de congélation (R1) est prévu entre le premier tuyau (11) et le second tuyau (21), est disposé à l'extérieur et est en outre pourvu d'un échangeur de chaleur secondaire (30) qui effectue un échange de chaleur mutuel entre le premier milieu de travail et le second milieu de travail. Le premier milieu de travail contient au moins une fluorooléfine et le second milieu de travail ne contient pas de fluorooléfine. Par conséquent, même lorsqu'une réaction de dismutation se produit dans la fluorooléfine, il est possible d'éviter de manière favorable le risque que l'influence de celle-ci atteigne l'intérieur.
PCT/JP2023/022264 2022-06-23 2023-06-15 Appareil de congélation WO2023248923A1 (fr)

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JP2022101354 2022-06-23

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001263801A (ja) * 2000-03-24 2001-09-26 Daikin Ind Ltd ヒートポンプ式給湯装置
JP2009041860A (ja) * 2007-08-09 2009-02-26 Toshiba Carrier Corp ヒートポンプ給湯装置の制御方法
WO2015136703A1 (fr) * 2014-03-14 2015-09-17 三菱電機株式会社 Dispositif à cycle de réfrigération
WO2015140872A1 (fr) * 2014-03-17 2015-09-24 三菱電機株式会社 Dispositif de réfrigération
WO2015140873A1 (fr) * 2014-03-17 2015-09-24 三菱電機株式会社 Dispositif de réfrigération et procédé de commande de dispositif de réfrigération
WO2018074452A1 (fr) * 2016-10-17 2018-04-26 ダイキン工業株式会社 Dispositif de réfrigération
JP2019163864A (ja) * 2018-03-19 2019-09-26 パナソニックＩｐマネジメント株式会社 冷凍サイクル装置
JP2021148339A (ja) * 2020-03-17 2021-09-27 三菱電機株式会社 ヒートポンプ装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001263801A (ja) * 2000-03-24 2001-09-26 Daikin Ind Ltd ヒートポンプ式給湯装置
JP2009041860A (ja) * 2007-08-09 2009-02-26 Toshiba Carrier Corp ヒートポンプ給湯装置の制御方法
WO2015136703A1 (fr) * 2014-03-14 2015-09-17 三菱電機株式会社 Dispositif à cycle de réfrigération
WO2015140872A1 (fr) * 2014-03-17 2015-09-24 三菱電機株式会社 Dispositif de réfrigération
WO2015140873A1 (fr) * 2014-03-17 2015-09-24 三菱電機株式会社 Dispositif de réfrigération et procédé de commande de dispositif de réfrigération
WO2018074452A1 (fr) * 2016-10-17 2018-04-26 ダイキン工業株式会社 Dispositif de réfrigération
JP2019163864A (ja) * 2018-03-19 2019-09-26 パナソニックＩｐマネジメント株式会社 冷凍サイクル装置
JP2021148339A (ja) * 2020-03-17 2021-09-27 三菱電機株式会社 ヒートポンプ装置

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