EP3073211B9 - Refrigeration cycle equipment - Google Patents

Refrigeration cycle equipment Download PDF

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Publication number
EP3073211B9
EP3073211B9 EP16161482.1A EP16161482A EP3073211B9 EP 3073211 B9 EP3073211 B9 EP 3073211B9 EP 16161482 A EP16161482 A EP 16161482A EP 3073211 B9 EP3073211 B9 EP 3073211B9
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
refrigerant
compressor
outdoor
pipe line
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.)
Active
Application number
EP16161482.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3073211B1 (en
EP3073211A1 (en
Inventor
Masatsugu Yamamoto
Tetsuma HAMASHIMA
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.)
Toshiba Carrier Corp
Original Assignee
Toshiba Carrier Corp
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Filing date
Publication date
Application filed by Toshiba Carrier Corp filed Critical Toshiba Carrier Corp
Priority to PL16161482T priority Critical patent/PL3073211T3/pl
Publication of EP3073211A1 publication Critical patent/EP3073211A1/en
Publication of EP3073211B1 publication Critical patent/EP3073211B1/en
Application granted granted Critical
Publication of EP3073211B9 publication Critical patent/EP3073211B9/en
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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
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F25B47/022—Defrosting cycles hot gas defrosting
    • F25B47/025—Defrosting cycles hot gas defrosting by reversing the 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
    • 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
    • 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
    • F25B2400/04—Refrigeration circuit bypassing means
    • F25B2400/0409—Refrigeration circuit bypassing means for the evaporator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/04—Refrigeration circuit bypassing means
    • F25B2400/0411—Refrigeration circuit bypassing means for the expansion valve or capillary tube
    • 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
    • F25B2500/31—Low ambient temperatures
    • 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
    • F25B2700/2106—Temperatures of fresh outdoor air

Definitions

  • the present invention relates to a refrigeration cycle equipment.
  • a control unit of the refrigeration cycle equipment controls the four-way valve to switch the direction of the refrigerant flow for a cooling operation and perform a defrosting operation (reverse-defrost) to dissolve the frost adhering to the fins of the outdoor heat exchanger.
  • prior art provides an equipment for effectively performing the defrosting operation by connecting a refrigerant pipe between the outdoor heat exchanger and the expansion valve and a refrigerant pipe between a suction (intake) side of the compressor and the four-way valve by using a bypass pipe to raise an suction pressure of the compressor by sucking highly heated refrigerant through the bypass pipe during the defrosting operation, thereby increasing the temperature of the refrigerant discharged from the compressor (as disclosed, for example, in Japanese Patent Laid-open No. HEI 9-159329 (Patent Document 1).
  • EP 1 647 783 A2 discloses a refrigeration/air conditioning equipment including an injection circuit for evaporating a bypassed high-pressure liquid at intermediate pressure and injecting the vaporized refrigerant into a compressor.
  • the present invention was conceived in consideration of the circumstances mentioned above and to provide a refrigeration cycle equipment capable of performing a heating operation even in an extremely cold environment.
  • a refrigeration cycle equipment which includes: a compressor; a four-way valve; an outdoor heat exchanger; an expansion valve; an indoor heat exchanger; a refrigerant pipe line which sequentially connects a compressor, a four-way valve, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger; a bypass pipe line connecting a refrigerant pipe line between the outdoor heat exchanger and the expansion valve and a refrigerant pipe line between a suction port of the compressor and the four-way valve; an open/close valve provided for the bypass pipe line; an outdoor temperature sensor provided for the outdoor heat exchanger to detect an outdoor temperature; and a control unit controlling the compressor, the four-way valve, the expansion valve, and the open/close valve.
  • the control unit controls the open/close valve of the bypass pipe line to be opened at a time when the outdoor temperature is detected to be more than a predetermined temperature in a defrosting operation of the refrigeration cycle equipment.
  • control unit performs the controlling of the open/close valve provided for the bypass line to be opened at a time when the outdoor temperature is detected to be more than a predetermined temperature in a defrosting operation of the refrigeration cycle equipment, and accordingly, the heating operation can be performed even in an extremely cold environment.
  • an air conditioner, i.e., refrigeration cycle equipment, 100 is provided with a heat-pump type refrigeration cycle constructed by a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an expansion valve 4, a receiver tank 5, an indoor heat exchanger 6, and an accumulator 7 which are connected in this order via a refrigerant pipe P.
  • a refrigerant of R32 fills this refrigeration cycle.
  • the outdoor heat exchanger 3 and the expansion valve 4 are connected with each other by a refrigerant pipe P1
  • the four-way valve 2 and the accumulator 7 are connected with each other by a refrigerant pipe P2
  • these refrigerant pipes P1 and P2 are connected by a bypass pipe line 8.
  • the bypass pipe line 8 is provided, on an intermediate portion, with an open/close valve (open/close mechanism) 9 for opening or closing the bypass pipe line 8 and with a capillary tube (decompression device) 10 for controlling a flow rate of the refrigerant.
  • the refrigerant discharged from the compressor 1 flows into the indoor heat exchanger (evaporator) 6 via the four-way valve 2, the outdoor heat exchanger (condenser) 3, the expansion valve 4, and the receiver tank 5, and the refrigerant flowing out of the indoor heat exchanger 6 is sucked into the compressor 1 via the four-way valve 2 and the accumulator 7.
  • the four-way valve 2 is switched in flow direction, and the refrigerant discharged from the compressor 1 flows into the indoor heat exchanger (condenser) 6, and the refrigerant flowing out of the indoor heat exchanger 6 is sucked into the compressor 1 via the receiver tank 5, the expansion valve 4, the outdoor heat exchanger (evaporator) 3, the four-way valve 2, and the accumulator 7.
  • the outdoor heat exchanger 3 and the indoor heat exchanger 6 are fin-tube heat exchangers, each provided with a plurality of heat-transfer fins arranged in parallel at a predetermined pitch and adapted to pass the heat-exchanged air through a gap between adjacent fins, and a heat transfer tube provided so as to penetrate these heat-transfer fins to thereby introduce the refrigerant inside the heat exchanger.
  • An outdoor fan 11 is disposed near the outdoor heat exchanger 3, and an indoor fan 12 is also disposed near the indoor heat exchanger 6.
  • the expansion valve 4 is so-called a pulse motor valve in an opening degree of which continuously changes in response to pulse numbers of a driving pulse signal to be inputted.
  • the receiver tank 5 is a refrigerant amount regulating container for storing surplus refrigerant generated in the refrigeration cycle
  • the accumulator 7 is a gas/liquid separator for separating the refrigerant into refrigerant gas and refrigerant liquid.
  • a refrigerant temperature sensor 15 is provided on an inlet side (in the heating operation period) of the outdoor heat exchanger 3.
  • a refrigerant temperature sensor 16 is also provided to the pipe line P2 between the four-way valve 2 and the accumulator 7, and an outdoor temperature sensor 17 on the outdoor air suction side near the outdoor heat exchanger 3.
  • the refrigerant temperature sensor 15 detects a temperature TE of the refrigerant flowing into the outdoor heat exchanger 3 at the heating operation period.
  • the refrigerant temperature sensor 16 detects a temperature TS of the refrigerant sucking into the compressor 1.
  • the outdoor temperature sensor 17 detects a temperature To of an outdoor air near the outdoor heat exchanger 3.
  • An inverter not shown, is connected to a motor of the compressor 1, and the inverter converts a voltage of an AC (alternate current) source into a DC (direct current) voltage, which is converted into an AC voltage having a predetermined frequency F, which is then outputted.
  • the motor of the compressor 1 is driven with a rotating speed (revolution number) in response to this frequency F.
  • the compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the expansion valve 4, the receiver tank 5, the accumulator 7, the bypass pipe line 8, the open/close valve 9, capillary tube 10, the outdoor fan 11, and the inverter are accommodated in the outdoor unit A, and on the other hand, the indoor heat exchanger 6 and the indoor fan 12 are accommodated in the indoor unit B.
  • the control unit 20 is connected to the outdoor unit A and the indoor unit B.
  • the control unit 20 is composed of a micro-computer and a peripheral circuit thereof and includes following means (elements or sections) (1) and (2) for mainly acting the following functions.
  • step S1 when the refrigeration cycle equipment 100 operates to start the heating operation (“YES” in step S1), the control unit 20 (first control section 20A) compares the detected temperature (outdoor temperature) To detected by the outdoor temperature sensor 17 with the first set value Tos1 (step S2). In this comparison, when the outdoor temperature To is more than the set value Tos1 (for example, -5°C) ("YES" in step S2), the control unit 20 starts the normal heating operation (step S3) and ends the heating operation start control.
  • the control unit 20 first control section 20A
  • step S2 when the outdoor temperature To is less than the set value Tos1 (for example, -5°C) ("NO" in step S2), the control unit 20 operates to set the four-way valve 2 to a position in the cooling operation and starts the cooling cycle operation (step S4).
  • Tos1 for example, -5°C
  • the control unit 20 then starts time counting t (step S5). In this operation, if the time count t does not reach the predetermined time ts ("NO” in step S6), the control unit 20 maintains the time count t (step S5). On the contrary, if the time count t reaches the predetermined time ts ("YES” in step S6), the control unit 20 stops the operation of the compressor 1 and switches the position of the four-way valve 2 to the position for the heating operation (step S7). Thereafter, the control unit 20 starts the normal heating operation (step S3) and ends the heating operation start control.
  • the refrigerant is liable to stagnate in components incorporated in the outdoor unit A such as the compressor 1, the outdoor heat exchanger 3, the accumulator 7. Under such stagnated condition of the refrigerant, the outdoor temperature is low and the refrigerant pressure is also low. At this instance, when the compressor 1 is started to operate in the heating operation mode, the suction pressure becomes liable to be negative, and the supply of the refrigerant machine oil to a sliding portion of the compressor is blocked, which may result in damage of the compressor 1.
  • the cooling operation is performed till a predetermined time elapses so as to preheat the inside of the refrigeration cycle.
  • the outdoor heat exchanger 3 is heated, and when the operation mode is switched to the heating operation mode, the suction pressure of the compressor 1 is not liable to become negative, and hence, the damage of the compressor 1 by the negative pressure can be prevented.
  • control unit 20 stops the operation of the indoor fan 12 as like as the defrosting operation in the cooling cycle operation before the heating operation start, so as not to flow cold wind into a room.
  • the refrigeration cycle equipment 100 starts the heating operation, and a condition for defrosting operation is satisfied ("YES" in step S11), the control unit 20 (second control section 20B) compares the detected temperature (outdoor temperature) To detected by the outdoor temperature sensor 17 with the second set value Tos2 (step S12). In such operation, the control unit 20 judges whether the defrosting operation is to be performed or not in consideration of the refrigerant temperature TE detected by the refrigerant temperature sensor 15, the refrigerant temperature TS detected by the refrigerant temperature sensor 16, and the outdoor temperature To detected by the outdoor temperature sensor 17.
  • the control unit 20 operates to open the open/close valve 9 of the bypass pipe line 8 (step S13) and starts the defrosting operation (step S14). At the defrosting operation, the control unit 20 changes the position of the four-way valve 2 to take the cooling operation position from the heating operation position.
  • step S15 When the refrigeration cycle equipment 100 starts the defrosting operation, and continues the defrosting operation ("NO” in step S15) till the defrosting operation end condition is satisfied, and if the defrosting operation end condition is satisfied ("YES" in step S15), the control unit 20 judges the open/close condition of the open/close valve 9 of the bypass pipe line 8 (step S16).
  • step S16 if the open/close valve 9 is opened, ("YES" in step S16), the valve 9 is closed (step 17). On the other hand, the open/close valve 9 is closed in the step S16, the operation proceeds to the next step S18 to end the defrosting operation control.
  • the open/close operation of the open/close valve 9 of the bypass pipe line 8 can be controlled by the control unit 20 including the first and second control sections 20A and 20B, there is provided the refrigeration cycle equipment which can perform the heating operation even under an extremely cold environment.

Landscapes

  • 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)
  • Air Conditioning Control Device (AREA)
EP16161482.1A 2015-03-25 2016-03-21 Refrigeration cycle equipment Active EP3073211B9 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL16161482T PL3073211T3 (pl) 2015-03-25 2016-03-21 Sprzęt obiegu chłodniczego

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2015062023A JP6465711B2 (ja) 2015-03-25 2015-03-25 冷凍サイクル装置

Publications (3)

Publication Number Publication Date
EP3073211A1 EP3073211A1 (en) 2016-09-28
EP3073211B1 EP3073211B1 (en) 2020-02-26
EP3073211B9 true EP3073211B9 (en) 2020-07-15

Family

ID=55587210

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16161482.1A Active EP3073211B9 (en) 2015-03-25 2016-03-21 Refrigeration cycle equipment

Country Status (3)

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EP (1) EP3073211B9 (ja)
JP (1) JP6465711B2 (ja)
PL (1) PL3073211T3 (ja)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6551437B2 (ja) * 2017-02-28 2019-07-31 ダイキン工業株式会社 空調機
CN109210810A (zh) 2017-07-04 2019-01-15 开利公司 制冷系统及用于制冷系统的启动控制方法
CN107702293A (zh) * 2017-09-20 2018-02-16 青岛海尔空调电子有限公司 空调器除霜控制方法
CN108001164B (zh) * 2017-12-07 2021-07-27 湖南华强电气股份有限公司 一种车载热泵空调机组的控制方法
JP6556385B1 (ja) * 2018-01-15 2019-08-07 三菱電機株式会社 空気調和装置
CN109269017A (zh) * 2018-09-03 2019-01-25 南京天加环境科技有限公司 一种不停机除霜的多联机单模块系统
KR20210104476A (ko) * 2020-02-17 2021-08-25 엘지전자 주식회사 공기조화기
CN113124513B (zh) * 2021-05-06 2022-05-10 珠海格力电器股份有限公司 空调系统及其控制方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62200144A (ja) * 1986-02-25 1987-09-03 松下冷機株式会社 ヒ−トポンプ式空気調和機
JP3290251B2 (ja) * 1993-07-16 2002-06-10 東芝キヤリア株式会社 空気調和機
JPH0861813A (ja) * 1994-08-22 1996-03-08 Matsushita Electric Ind Co Ltd ヒートポンプ冷凍サイクル
JPH09159329A (ja) * 1995-12-12 1997-06-20 Toyotomi Co Ltd ヒートポンプ式空気調和装置
JP2002107014A (ja) * 2000-10-04 2002-04-10 Sharp Corp 空気調和機
JP2003302131A (ja) * 2002-04-08 2003-10-24 Sanyo Electric Co Ltd 空気調和装置および空気調和装置の制御方法
JP4459776B2 (ja) * 2004-10-18 2010-04-28 三菱電機株式会社 ヒートポンプ装置及びヒートポンプ装置の室外機
JP5144728B2 (ja) * 2010-09-09 2013-02-13 パナソニック株式会社 空気調和機

Also Published As

Publication number Publication date
EP3073211B1 (en) 2020-02-26
PL3073211T3 (pl) 2020-07-13
JP2016180564A (ja) 2016-10-13
JP6465711B2 (ja) 2019-02-06
EP3073211A1 (en) 2016-09-28

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