WO2008018968A2 - Dégivrage commandé électriquement et appareil à détendeur - Google Patents

Dégivrage commandé électriquement et appareil à détendeur Download PDF

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Publication number
WO2008018968A2
WO2008018968A2 PCT/US2007/015656 US2007015656W WO2008018968A2 WO 2008018968 A2 WO2008018968 A2 WO 2008018968A2 US 2007015656 W US2007015656 W US 2007015656W WO 2008018968 A2 WO2008018968 A2 WO 2008018968A2
Authority
WO
WIPO (PCT)
Prior art keywords
controller
defrost
evaporator
refrigeration system
expansion valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2007/015656
Other languages
English (en)
Other versions
WO2008018968A3 (fr
Inventor
Kenneth W. Owen
Ran Luo
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.)
Standex International Corp
Original Assignee
Standex International Corp
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 Standex International Corp filed Critical Standex International Corp
Publication of WO2008018968A2 publication Critical patent/WO2008018968A2/fr
Publication of WO2008018968A3 publication Critical patent/WO2008018968A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2104—Temperatures of an indoor room or compartment
    • 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
    • F25B2700/2117—Temperatures of an evaporator
    • F25B2700/21174—Temperatures of an evaporator of the refrigerant at the inlet of 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2117—Temperatures of an evaporator
    • F25B2700/21175—Temperatures of an evaporator of the refrigerant at the outlet of 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002—Defroster control
    • F25D21/006—Defroster control with electronic control circuits

Definitions

  • This invention relates generally to space cooling systems, in particular to apparatus for controlling a space cooling system with respect to the defrost cycle.
  • a typical space cooling system includes at least one evaporator system contained within the space that is to be cooled, a condenser system that is located outside of the cooled space, and a compressor positioned between the condenser system outlet and the evaporator system inlet and, finally, an expansion valve which completes the loop joining together the condenser system outlet and the evaporator system inlet.
  • A. refrigerant is circulated within the loop which cools the space as follows. The refrigerant is compressed by the compressor which raises the temperature and pressure of the refrigerant. The hot pressurized refrigerant gas then flows through the condenser system which serves as heat exchanger to allow the refrigerant to dissipate the heat of pressurization.
  • the refrigerant condenses into a liquid and then flows through the expansion valve, where the liquid refrigerant moves from a high pressure zone into a low pressure zone, thus expanding and evaporating. In evaporating, the refrigerant becomes cold where it then passes into coils of the evaporator, thus absorbing heat from inside the space that is to be cooled and the cycle then repeats until the space reaches the desired temperature. 7 015656
  • a fan assist the heat transfer from the cooled space to the coils of the evaporator system and another fan is used to assist the heat transfer from the coils of the condenser to outside environment.
  • a negative pressure differential is present on the evaporator outlet when the device is operating in a refrigeration mode thereby suctioning the gas refrigerant to the compressor.
  • thermistor sensors are placed at the inlet and outlet of the evaporator system for measuring the level of superheat across the evaporator.
  • a sensor located on the outlet side of the compressor measures the discharge temperature of compressor.
  • the ambient temperature of the spaced to be cooled is measured by still another sensor.
  • the need to defrost the evaporator from any ice build-up due to the cooling process is determined by another sensor that is associated with evaporator so that defrosting procedures can be monitored.
  • An refrigeration apparatus that has both an electrical controller that responds to evaporator superheat and return air temperature to the expansion valve as well as controls a reversing valve which provides for a defrosting cycle, eliminates the need for electric heaters, check valves, head pressure control valve as well as the associated piping and connections is not found in the prior art.
  • Another aspect of the invention is to provide a refrigeration system that leaves the evaporator coil virtually clean after each defrost cycle.
  • Another aspect of the invention is to provide a refrigeration system that eliminates the need for check valves and an expansion valve at the condenser.
  • Still another aspect of the invention is to provide a refrigeration system that has less wiring and is less expensive to produce and operate than present devices.
  • Fig. 1 is a schematic of the most basic embodiment of the invention operating during a refrigeration cycle.
  • Fig. 2 is a schematic of the embodiment shown in Fig. 1 operating during a defrost cycle.
  • Fig. 1. which depicts the basic elements of the invention 10, the refrigeration cycle is similar to that discussed above for the typical space cooling device discussed in the background.
  • invention 10 includes both a controller 12 and a reversing valve 24 which are discussed below.
  • Refrigerant (not shown) is compressed by the compressor 26, The temperature and pressure of the refrigerant is raised.
  • the hot pressurized refrigerant gas then flows through the reversing valve 24 to the condenser system 22.
  • condenser system 22 functions as a heat exchanger to allow the refrigerant to dissipate the heat of pressurization.
  • the refrigerant condenses into a liquid and then flows through the expansion valve 20, where the liquid refrigerant moves from a high pressure zone into a low pressure zone, thus expanding and evaporating.
  • Electric expansion valve 20 is preferably a step motor such as manufactured by companies such as Sporlan, Alco, Parker or Danfoss.
  • the refrigerant flow of the electric expansion valve 20 is controlled by controller 12 and is modulated to control the superheat of the evaporator 28.
  • the superheat of evaporator 28 is determined by measuring sensor 16 and 18 using techniques well known in the art. In evaporating, the refrigerant then passes into coils of the evaporator 28, thus absorbing heat from inside the space 30 that is to be cooled and the cycle then repeats until the space reaches the desired temperature as provided by sensor 14.
  • the controller 12 can be set to defrost mode that is either electric (using standard heater technology) or reverse cycle (utilizing the instant invention).
  • defrost mode that is either electric (using standard heater technology) or reverse cycle (utilizing the instant invention).
  • Reverse valve assembly 24 is readily available from companies such as
  • Controller 12 checks sensors 16 and 18. If the temperature at sensor
  • DTT defrost termination temperature
  • DTT defrost termination temperature
  • Compressor 26 may pumpdown the refrigerant and may be cut off by the low- pressure control of compressor 26. While the compressor 26 is engaged in the pumpdown mode, the evaporator fans (not shown) remain off. Compressor 26 may also be shut off by controller 12 if so wired.
  • Reversing valve assembly 24 is not de-energized until the end of the drip mode.
  • the refrigerant flows change from defrost cycle to refrigerating cycle when controller 12 enters US2007/015656
  • the fan delay mode (cool mode if the fan delay mode is skipped) after drip mode. If the pumpdown after a defrost cycle takes longer than drip mode, the controller 12 will enter fan delay mode even though the pumpdown may not be completed. For example, if a pumpdown takes 4 minutes to complete and the drip time is pre-set to 3 minutes, when the 3 minute drip time expires, controller 12 will enter fan delay mode and expansion valve 20 will be modulating. Note the compressor 26 may be running through pumpdown mode, drip mode and fan delay mode. A reverse cycle defrost is considered complete when the controller 12 enters the fan delay mode. As noted above, when there is no defrost, all operations are the same as current version of the applicant's electric expansion valve refrigeration control system which is well known in the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Defrosting Systems (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

L'invention concerne un système de refroidissement comprenant un régulateur électrique commandant un détendeur électrique et le cycle de dégivrage par une soupape d'inversion, éliminant ainsi le besoin d'un circuit chauffant pour le dégivrage. Le système permet de dégivrer le système d'évaporateur en moins de temps que celui les des procédés de dégivrage classiques. Le système de refroidissement élimine également le besoin d'un clapet de régulation de pression de refoulement et des clapets de non-retour. De plus, la diminution des câblages et des coûts de fonctionnement plus faibles permet des économies de coûts significatives.
PCT/US2007/015656 2006-07-07 2007-07-09 Dégivrage commandé électriquement et appareil à détendeur Ceased WO2008018968A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/483,258 US20070033955A1 (en) 2003-07-10 2006-07-07 Electrically controlled defrost and expansion valve apparatus
US11/483,258 2006-07-07

Publications (2)

Publication Number Publication Date
WO2008018968A2 true WO2008018968A2 (fr) 2008-02-14
WO2008018968A3 WO2008018968A3 (fr) 2008-11-13

Family

ID=39033457

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/015656 Ceased WO2008018968A2 (fr) 2006-07-07 2007-07-09 Dégivrage commandé électriquement et appareil à détendeur

Country Status (2)

Country Link
US (1) US20070033955A1 (fr)
WO (1) WO2008018968A2 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8291718B2 (en) * 2010-09-02 2012-10-23 General Electric Company DSM defrost during high demand
JP5999171B2 (ja) * 2014-12-26 2016-09-28 ダイキン工業株式会社 空気調和装置
CN105571222A (zh) * 2015-12-22 2016-05-11 佛山欧思丹热能科技有限公司 热泵除霜控制方法
EP3196569A1 (fr) * 2016-01-21 2017-07-26 Vaillant GmbH Agencement de capteur dans un système de pompe à chaleur
AU2017378601B2 (en) * 2016-12-13 2020-03-19 Daikin Industries, Ltd. Heat transfer device and heat transfer method using same
KR20180120975A (ko) * 2017-04-28 2018-11-07 엘지전자 주식회사 냉장고 및 그 제어 방법
JP6896076B2 (ja) * 2017-07-07 2021-06-30 三菱電機株式会社 冷凍サイクル装置
ES2997862T3 (en) * 2018-12-28 2025-02-18 Thermo King Llc Methods and systems for supplemental flow control of working fluid through a climate control circuit

Family Cites Families (13)

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Publication number Priority date Publication date Assignee Title
US4017286A (en) * 1975-12-22 1977-04-12 Westinghouse Electric Corporation Heat pump suction line vent
US4333316A (en) * 1980-10-14 1982-06-08 General Electric Company Automatic control apparatus for a heat pump system
US4766734A (en) * 1987-09-08 1988-08-30 Electric Power Research Institute, Inc. Heat pump system with hot water defrost
US5187944A (en) * 1992-04-10 1993-02-23 Eaton Corporation Variable superheat target strategy for controlling an electrically operated refrigerant expansion valve
US5438844A (en) * 1992-07-01 1995-08-08 Gas Research Institute Microprocessor-based controller
US5475986A (en) * 1992-08-12 1995-12-19 Copeland Corporation Microprocessor-based control system for heat pump having distributed architecture
US5460009A (en) * 1994-01-11 1995-10-24 York International Corporation Refrigeration system and method
US5546756A (en) * 1995-02-08 1996-08-20 Eaton Corporation Controlling an electrically actuated refrigerant expansion valve
US5927083A (en) * 1998-03-09 1999-07-27 Carrier Corporation Compressor cycle dependent defrost control
US6334321B1 (en) * 2000-03-15 2002-01-01 Carrier Corporation Method and system for defrost control on reversible heat pumps
US6467282B1 (en) * 2000-09-27 2002-10-22 Patrick D. French Frost sensor for use in defrost controls for refrigeration
US6601396B2 (en) * 2001-12-03 2003-08-05 Kendro Laboratory Products, Lp Freezer defrost method and apparatus
US6874693B2 (en) * 2002-12-20 2005-04-05 Honeywell International Inc. Method and apparatus for controlling a multi-source heating system

Also Published As

Publication number Publication date
WO2008018968A3 (fr) 2008-11-13
US20070033955A1 (en) 2007-02-15

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