EP3992552A1 - Kältekreislaufvorrichtung - Google Patents

Kältekreislaufvorrichtung Download PDF

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Publication number
EP3992552A1
EP3992552A1 EP21191420.5A EP21191420A EP3992552A1 EP 3992552 A1 EP3992552 A1 EP 3992552A1 EP 21191420 A EP21191420 A EP 21191420A EP 3992552 A1 EP3992552 A1 EP 3992552A1
Authority
EP
European Patent Office
Prior art keywords
refrigerant
discharge
expanding device
refrigeration cycle
discharge temperature
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
EP21191420.5A
Other languages
English (en)
French (fr)
Inventor
Tsuneko Imagawa
Yuki YAMAOKA
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.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
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 Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Publication of EP3992552A1 publication Critical patent/EP3992552A1/de
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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/13—Economisers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/07—Exceeding a certain pressure value in a refrigeration component or 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
    • F25B2500/00—Problems to be solved
    • F25B2500/08—Exceeding a certain temperature value in a refrigeration component or 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2509—Economiser 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
    • F25B2600/2513—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1931—Discharge pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor

Definitions

  • the present disclosure relates to a refrigeration cycle device.
  • Patent document 1 discloses a refrigeration device including a plurality of compressors placed in multiple stages in series for compressing refrigerant, and a bypass refrigerant circuit which bypasses a portion of circulating refrigerant of a main refrigerant circuit to a location between the plurality of compressors.
  • the portion of the refrigerant of the main refrigerant circuit is expanded by an electronic expansion valve placed in the bypass refrigerant circuit, the portion of the refrigerant exchanges heat with refrigerant which flows through the main refrigerant circuit and thereafter, the portion of the refrigerant bypasses to the location between the plurality of compressors, it joins up with refrigerant discharged from low stage one of the plurality of compressors, and it is sucked into high stage one of the compressors.
  • Discharge temperature of the high stage compressor is always detected, and when it is expected that the discharge temperature of the high stage compressor exceeds an upper limit, and control is performed such that an opening degree of the electronic expansion valve in the bypass refrigerant circuit is temporarily increased to lower the discharge temperature.
  • Patent Document 1 Japanese Patent Application Laid-open No.2009-192164
  • the present disclosure provides a refrigeration cycle device having high reliability in which even if discharge temperature and discharge pressure increase and their values reach upper limits of an operating range, it is possible to suppress increase in discharge temperature and discharge pressure without exceeding the upper limits.
  • a refrigeration cycle device in the present disclosure includes: a main refrigerant circuit formed by sequentially connecting, to one another through a pipe, a compressing mechanism composed of a compression rotating element, a usage-side heat exchanger for heating usage-side heat medium by refrigerant which is discharged from the compression rotating element, an intermediate heat exchanger, a first expanding device and a heat source-side heat exchanger; a bypass refrigerant circuit in which refrigerant which branches off from the pipe between the usage-side heat exchanger and the first expanding device is decompressed by the second expanding device and thereafter, heat of the refrigerant is exchanged with that of the refrigerant which flows through the main refrigerant circuit by the intermediate heat exchanger, and the refrigerant joins up with the refrigerant which is in middle of a compression operation of the compression rotating element; discharge temperature detecting means for detecting discharge temperature of the compression rotating element; discharge pressure detecting means for detecting discharge pressure of the compression rotating element; and a control device, wherein when the discharge pressure of the compression
  • the present disclosure can provide a refrigeration cycle device having high reliability in which even if discharge temperature and discharge pressure increase and their values reach upper limits of an operating range, it is possible to suppress increase in discharge temperature and discharge pressure without exceeding the upper limits.
  • a refrigeration cycle device includes a main refrigerant circuit 8 and a bypass refrigerant circuit 6.
  • the main refrigerant circuit 8 is formed by sequentially connecting, to one another through a pipe, a compressing mechanism 1 which is composed of a compression rotating element, a usage-side heat exchanger 2 which is a radiator, an intermediate heat exchanger 5, a first expanding device 3 and a heat source-side heat exchanger 4 which is an evaporator.
  • a compressing mechanism 1 which is composed of a compression rotating element
  • a usage-side heat exchanger 2 which is a radiator
  • an intermediate heat exchanger 5 which is a first expanding device 3
  • a heat source-side heat exchanger 4 which is an evaporator.
  • Carbon dioxide (CO 2 ) is used as refrigerant.
  • the compressing mechanism 1 is composed of a high stage compressing portion 11 and a low stage compressing portion 12.
  • usage-side heat medium is heated by refrigerant discharged from the compressing mechanism 1.
  • the compression rotating element is illustrated as a two-stage compressing mechanism composed of the low stage compressing portion 12 and the high stage compressing portion 11, but the compression rotating element can be applied to a single compressing mechanism.
  • a position where refrigerant from the bypass refrigerant circuit 6 is sucked is defined as a compression midstream of the compression rotating element.
  • a portion of the compression rotating element extending up to a position where refrigerant from the main refrigerant circuit 8 and refrigerant from the bypass refrigerant circuit 6 merge with each other is defined as the low stage compressing portion 12.
  • a portion of the compression rotating element extending after the position where the refrigerant from the bypass refrigerant circuit 6 merge is defined as the high stage compressing portion 11.
  • the bypass refrigerant circuit 6 branches off from the main refrigerant circuit 8 through a pipe between the usage-side heat exchanger 2 and the intermediate heat exchanger 5, and the bypass refrigerant circuit 6 is connected to a location between the low stage compressing portion 12 and the high stage compressing portion 11.
  • the bypass refrigerant circuit 6 is provided with a second expanding device 7.
  • a partial high pressure refrigerant which passes through the usage-side heat exchanger 2 is decompressed by the second expanding device 7, and becomes intermediate pressure refrigerant.
  • the intermediate pressure refrigerant exchanges heat in the intermediate heat exchanger 5 with high pressure refrigerant which flows through the main refrigerant circuit 8, and the intermediate pressure refrigerant joins up with refrigerant which flows through the main refrigerant circuit 8 between the low stage compressing portion 12 and the high stage compressing portion 11 and which is in the compression midstream state.
  • Usage-side heat medium heated by the usage-side heat exchanger 2 is utilized for heating a room by a usage-side terminal (not shown). Water or antifreeze liquid is used as the usage-side heat medium.
  • a discharge pipe of the compressing mechanism 1 is provided with a discharge temperature sensor 15 which is discharge temperature detecting means and a discharge pressure sensor 16 which is discharge pressure detecting means. Discharge temperature detected by the discharge temperature sensor 15 and discharge pressure detected by the discharge pressure sensor 16 are taken into a control device 20 as data.
  • predetermined temperature is a value which is lower, by a first predetermined value, than a value of discharge temperature that is the upper limit of the operating range of the refrigeration cycle device
  • predetermined pressure is a value which is lower, by a second predetermined value, than a value of discharge pressure that is the upper limit of the operating range of the refrigeration cycle device.
  • the predetermined temperature and the predetermined pressure are preset in the control device 20 as threshold values.
  • the value of the discharge temperature which is the upper limit of the operating range of the refrigeration cycle device and the value of the discharge pressure which is the upper limit of the operating range of the refrigeration cycle device are values in which the control device 20 stops the operation of the refrigeration cycle device.
  • the control device 20 controls such that the opening degree of the first expanding device 3 and the opening degree of the second expanding device 7 are increased.
  • the discharge pressure sensor 16 detects pressure of high pressure refrigerant of the main refrigerant circuit 8.
  • the discharge pressure sensor 16 is provided in a discharge-side pipe of the compressing mechanism 1, or is provided in an upstream-side pipe of the first expanding device 3.
  • the discharge-side pipe of the compressing mechanism 1 and the upstream-side pipe of the first expanding device 3 are pipes of the main refrigerant circuit 8.
  • Figs. 2 to 4 are pressure-enthalpy diagrams (P-h diagrams) when the opening degrees of the first and second expanding devices are increased in the refrigeration cycle device of the embodiment.
  • Fig. 2 shows variation of the refrigeration cycle when the opening degree of only the second expanding device 7 is increased. Solid lines show a state before the opening degree is increased, and broken lines show a state after the opening degree is increased.
  • Fig. 3 shows variation of the refrigeration cycle when the opening degree of only the first expanding device 3 is increased. Solid lines show a state before the opening degree is increased, and broken lines show a state after the opening degree is increased.
  • Fig. 4 shows variation of the refrigeration cycle when the opening degrees of the first and second expanding devices 3 and 7 are increased. Solid lines show a state before the opening degree is increased, and broken lines show a state after the opening degree is increased.
  • the cooled high pressure refrigerant is decompressed by the first expanding device 3 in a state where its enthalpy is reduced (point b).
  • Refrigerant of the main refrigerant circuit 8 which is decompressed by the first expanding device 3 and becomes gas-liquid two-phase state evaporates by endotherm from the outside air in the evaporator 4, and becomes gas phase.
  • the refrigerant which becomes the gas phase returns to a suction side (point d) of the compressing mechanism 1, and is compressed by the low stage compressing portion 12 of the compressing mechanism 1.
  • broken lines show variation of the refrigeration cycle when the opening degree of the second expanding device 7 is increased.
  • the merged refrigerant whose temperature was lowered is compressed by the high stage compressing portion 11 and discharged from the compressing mechanism 1.
  • the discharge temperature (point a) of the discharged refrigerant can be equal to or lower than the threshold value, and it is possible to suppress a rise in the discharge temperature.
  • Action of the refrigeration cycle device before (solid lines) the opening degree of the first expanding device 3 is increased is the same as action before the opening degree of the second expanding device 7 in Fig. 2 is increased and therefore, its description will be omitted.
  • broken lines show variation of the refrigeration cycle when the opening degree of the first expanding device 3 is increased.
  • the opening degree of the first expanding device 3 is increased, the amount of refrigerant flowing through the main refrigerant circuit 8 is increased, and the amount of refrigerant flowing through the bypass refrigerant circuit 6 is reduced. Therefore, discharge pressure of the compressing mechanism 1 is reduced and it can be equal to or lower than the threshold value.
  • discharge temperature (point a) of refrigerant which is compressed by the high stage compressing portion 11 and which is discharged from the compressing mechanism 1 rises and exceeds the threshold value.
  • the discharge temperature and the discharge pressure are close to the upper limits of the operating range of the refrigeration cycle device. That is, the refrigeration cycle device is operated in a state where both the discharge temperature and the discharge pressure exceed the respective threshold values.
  • control device 20 controls to increase the opening degrees of both the first expanding device 3 and the second expanding device 7. According to this, a state of the refrigeration cycle shown with solid lines is changed to that shown with broken lines.
  • the predetermined temperature is a value which is lower, by the first predetermined value, than the discharge temperature value which is the upper limit of the operating range of the refrigeration cycle device
  • the predetermined pressure is a value which is lower, by the second predetermined value, than the discharge pressure value which is the upper limit of the operating range of the refrigeration cycle device.
  • the predetermined temperature and the predetermined pressure are preset in the control device 20 as respective threshold values.
  • control device 20 controls to increase the opening degrees of the first expanding device 3 and the second expanding device 7.
  • an opening degree of the second expansion device 7 is increased, and a merging amount of refrigerant having low temperature is increased.
  • a flow rate of refrigerant which flows into the compressing mechanism 1 increases and the discharge pressure increases
  • an opening degree of the first expansion device 3 is increased, and an amount of refrigerant which flows through the main refrigerant circuit 8 is increased. According to this, the increased discharge pressure can be reduced.
  • control device 20 controls to increase the opening degree of the first expanding device 3.
  • the amount of low temperature refrigerant which joins up from the bypass refrigerant circuit 6 is increased and thereafter, the pressure reduction amount of the main refrigerant circuit 8 is reduced.
  • control device 20 controls to increase the variation amount of the opening degree of the second expanding device 7.
  • control device 20 controls to increase the variation amount of the opening degree of the second expanding device 7.
  • a refrigeration cycle device includes: a main refrigerant circuit 8 formed by sequentially connecting, to one another through a pipe, a compressing mechanism 1 composed of a compression rotating element, a usage-side heat exchanger 2 for heating usage-side heat medium by refrigerant which is discharged from the compression rotating element, an intermediate heat exchanger 5, a first expanding device 3 and a heat source-side heat exchanger 4; a bypass refrigerant circuit 6 in which refrigerant which branches off from the pipe between the usage-side heat exchanger 2 and the first expanding device 3 is decompressed by the second expanding device 7 and thereafter, heat of the refrigerant is exchanged with that of the refrigerant which flows through the main refrigerant circuit 8 by the intermediate heat exchanger 5, and the refrigerant joins up with the refrigerant which is in middle of a compression operation of the compression rotating element; discharge temperature detecting means 15 for detecting discharge temperature of the compression rotating element; discharge pressure detecting means 16 for detecting discharge pressure of the compression rotating element
  • the control device 20 increases the opening degree of the second expanding device 7.
  • the control device 20 increases the opening degree of the first expanding device 3.
  • the amount of the low temperature refrigerant which joins up from the bypass refrigerant circuit 6 is increased and thereafter, the pressure reduction amount of the main refrigerant circuit 8 is reduced.
  • control device 20 determines a variation amount of the opening degree of the second expanding device 7 based on a temperature difference between the discharge temperature of the compression rotating element and the predetermined temperature.
  • the present invention can be applied to an air conditioner, a hot water supply system and the like.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
EP21191420.5A 2020-10-30 2021-08-16 Kältekreislaufvorrichtung Pending EP3992552A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2020182013A JP2022072526A (ja) 2020-10-30 2020-10-30 冷凍サイクル装置

Publications (1)

Publication Number Publication Date
EP3992552A1 true EP3992552A1 (de) 2022-05-04

Family

ID=77358126

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21191420.5A Pending EP3992552A1 (de) 2020-10-30 2021-08-16 Kältekreislaufvorrichtung

Country Status (2)

Country Link
EP (1) EP3992552A1 (de)
JP (1) JP2022072526A (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2088390A2 (de) * 2008-02-07 2009-08-12 Mitsubishi Electric Corporation Außeneinheit eines Wärmepumpenwassererhitzers und Wärmepumpenwassererhitzer
JP2009192164A (ja) 2008-02-15 2009-08-27 Mitsubishi Electric Corp 冷凍装置
US20150020535A1 (en) * 2012-04-27 2015-01-22 Mitsubishi Electric Corporation Air-conditioning apparatus
US20150362235A1 (en) * 2013-03-12 2015-12-17 Mitsubishi Electric Corporation Air-conditioning apparatus
GB2533041A (en) * 2013-08-30 2016-06-08 Mitsubishi Electric Corp Air conditioner
WO2020071299A1 (ja) * 2018-10-02 2020-04-09 ダイキン工業株式会社 冷凍サイクル装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2088390A2 (de) * 2008-02-07 2009-08-12 Mitsubishi Electric Corporation Außeneinheit eines Wärmepumpenwassererhitzers und Wärmepumpenwassererhitzer
JP2009192164A (ja) 2008-02-15 2009-08-27 Mitsubishi Electric Corp 冷凍装置
US20150020535A1 (en) * 2012-04-27 2015-01-22 Mitsubishi Electric Corporation Air-conditioning apparatus
US20150362235A1 (en) * 2013-03-12 2015-12-17 Mitsubishi Electric Corporation Air-conditioning apparatus
GB2533041A (en) * 2013-08-30 2016-06-08 Mitsubishi Electric Corp Air conditioner
WO2020071299A1 (ja) * 2018-10-02 2020-04-09 ダイキン工業株式会社 冷凍サイクル装置

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JP2022072526A (ja) 2022-05-17

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