EP0477475A2 - Kältekreislauf und Abtauverfahren dazu - Google Patents

Kältekreislauf und Abtauverfahren dazu Download PDF

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Publication number
EP0477475A2
EP0477475A2 EP91110116A EP91110116A EP0477475A2 EP 0477475 A2 EP0477475 A2 EP 0477475A2 EP 91110116 A EP91110116 A EP 91110116A EP 91110116 A EP91110116 A EP 91110116A EP 0477475 A2 EP0477475 A2 EP 0477475A2
Authority
EP
European Patent Office
Prior art keywords
evaporator
compressor
frosting
refrigeration circuit
counter
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.)
Granted
Application number
EP91110116A
Other languages
English (en)
French (fr)
Other versions
EP0477475A3 (en
EP0477475B1 (de
Inventor
Giuseppe Casanova
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.)
Costan SpA
Original Assignee
Costan SpA
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 Costan SpA filed Critical Costan SpA
Publication of EP0477475A2 publication Critical patent/EP0477475A2/de
Publication of EP0477475A3 publication Critical patent/EP0477475A3/en
Application granted granted Critical
Publication of EP0477475B1 publication Critical patent/EP0477475B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/04—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in series
    • 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

Definitions

  • This invention relates to an improved refrigeration circuit, particularly of the type which is incorporated to refrigerated display counters and comprises a refrigerating gas compressor, a condenser, a first evaporator and at least one second evaporator connected in series to each other, and evaporator de-frosting means.
  • the invention also relates to a refrigerated counter having a refrigeration circuit which comprises a series of a first evaporator operating in conductive heat transfer with one or more walls of the counter and with a second finned or convective transfer evaporator which, in operation of the refrigerated counter, is swept by a forced air flow to enhance the convective heat transfer.
  • the invention further relates to a method of de-frosting such circuit and counter.
  • This operation is usually performed through heater means incorporated to the counter itself.
  • a known technical solution for meeting this demand provides for the conveying of all the "hot" refrigerating gas available at the compressor outlet through both evaporators, bypassing the condenser.
  • the circuit ceases to operate in accord with a refrigeration cycle throughout the duration of the de-frosting step. It follows that the heat available to de-frost is that deriving from the energy dissipated by the compressor. In addition, both evaporators are de-frosted, and this unavoidably involves a longer de-frosting time and longer pickup time for the refrigeration cycle to recover its running temperature.
  • the technical problem addressed by this invention is to provide a refrigeration circuit having such structural and functional characteristics as to overcome the above-mentioned drawbacks with which the prior art is beset.
  • the solutive idea on which the invention stands consists of tapping off a fraction of the "hot” refrigerating gas downstream from the compressor, while the remainder is allowed to carry on the refrigeration cycle, and admixing it, upstream of the second evaporator, to the "cool" refrigerating gas from the first evaporator.
  • a circuit as indicated being characterized in that said means comprise a bypass connection between the compressor outlet and the inlet to the second evaporator.
  • a pre-set solenoid valve is provided in the said bypass connection.
  • a method of de-frosting a refrigeration circuit comprising a refrigerating gas compressor, a condenser, and a first evaporator and at least one second evaporator connected serially to each other, characterized by tapping off some of the refrigerating gas downstream from the compressor and supplying the second evaporator with a mixture of said gas and gas exiting the first evaporator.
  • a refrigeration circuit embodying this invention is intended for installation in a refrigerated display counter 2 of which the remaining structural elements are conventional.
  • the circuit 1 utilizes the properties of a suitable conventional refrigerating fluid, such as freon, which forms the working fluid through the operation cycles to be described.
  • a suitable conventional refrigerating fluid such as freon
  • the circuit 1 comprises a compressor 3 having an outlet 4 in fluid communication with the inlet 9 of a condenser 5. Said condenser is cooled by a fan 6 driven by a motor 7.
  • the condenser has an outlet 8 connected to the inlet 19 of a first evaporator 10 through a series of a de-watering filter 11 and a capillary 12.
  • the evaporator 10 is placed in substantial contact with a vat-like wall 25 of the counter 2 intended to contain the products to be preserved, in an essentially conductive heat transfer relationship with that wall 25.
  • This first evaporator 10 is connected serially to a second, finned evaporator 13 which is in a substantially convective heat transfer relationship with its environment.
  • This second evaporator has an outlet 14 connected to the inlet of the compressor 3.
  • the circuit 1 comprises de-frosting means 15 for the evaporator 13.
  • Such means 15 comprise a one-way bypass connection 17 between the outlet 4 of the compressor 3 and the inlet of the second evaporator 13.
  • a solenoid valve 16 which is pre-set at a selected flow rate of the refrigerating fluid below the overall flow rate at the delivery outlet of the compressor 3, is provided in the connection 17.
  • the circuit 1 is essentially composed of a pair of circuit links 18, 20.
  • the first link 18 comprises the compressor 3, valve 16, and second evaporator 13; and the second link 20 includes, in turn, the compressor 3, condenser 5, and series of the evaporators 10, 13.
  • valve 16 When it is desired to start de-frosting the counter 2, the valve 16 is operated to an open position, and some of the fluid exiting the compressor 3 is tapped off the second circuit link 20 and directed into the second evaporator 13, over the connection 17.
  • the second evaporator 13 is supplied with a comparatively warm fluid consisting of the fluid exiting the first evaporator 10 and the fluid delivered from the compressor 3, mixed together.
  • the invention solves the aforementioned technical problem in a cost-efficient and effective manner.
  • a major advantage of the refrigeration circuit of this invention is that during the step of de-frosting the second evaporator, at least some of the refrigerating fluid is caused to undergo a normal refrigeration cycle, thereby enhancing the overall efficiency of the circuit.
  • the first evaporator that is the one directly contacting the products preserved in the refrigerated counter, will undergo no heating. This fact, besides affording quicker restoration of the cooling cycle, also prevents the products preserved under the counter from becoming heated and possibly damaged while de-frosting.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Defrosting Systems (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
EP91110116A 1990-09-28 1991-06-20 Kältekreislauf und Abtauverfahren dazu Expired - Lifetime EP0477475B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT4169990 1990-09-28
IT04169990A IT1244107B (it) 1990-09-28 1990-09-28 Circuito frigorifero perfezionato e relativo metodo di sbrinamento

Publications (3)

Publication Number Publication Date
EP0477475A2 true EP0477475A2 (de) 1992-04-01
EP0477475A3 EP0477475A3 (en) 1992-09-02
EP0477475B1 EP0477475B1 (de) 1994-12-21

Family

ID=11253142

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91110116A Expired - Lifetime EP0477475B1 (de) 1990-09-28 1991-06-20 Kältekreislauf und Abtauverfahren dazu

Country Status (6)

Country Link
EP (1) EP0477475B1 (de)
AT (1) ATE116054T1 (de)
DE (1) DE69106096T2 (de)
DK (1) DK0477475T3 (de)
ES (1) ES2066276T3 (de)
IT (1) IT1244107B (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994020803A1 (en) * 1993-03-08 1994-09-15 Greenhalgh Refrigeration Pty Ltd Refrigeration process and apparatus
EP0699883A3 (de) * 1994-08-31 1996-07-24 Nippon Denso Co Kälteanlage
US6935127B2 (en) * 2002-08-31 2005-08-30 Samsung Electronics Co., Ltd. Refrigerator
EP1825839A1 (de) 2006-02-28 2007-08-29 Ostomycure AS Implantat
US7370490B2 (en) * 2005-06-30 2008-05-13 Zhiming Li Air-conditioning system with full heat recovery
CN102003842A (zh) * 2010-11-04 2011-04-06 三花丹佛斯（杭州）微通道换热器有限公司 蒸发器和具有它的制冷系统
EP2364678A1 (de) 2007-08-21 2011-09-14 Ostomycure AS Implantat
CN104848497A (zh) * 2015-06-10 2015-08-19 广东志高暖通设备股份有限公司 一种空气调节器
CN105402937A (zh) * 2015-12-22 2016-03-16 广东志高暖通设备股份有限公司 一种空调系统

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007040658A (ja) * 2005-08-05 2007-02-15 Matsushita Electric Ind Co Ltd 空気調和装置
GB201105126D0 (en) 2011-03-25 2011-05-11 Ostomycure As Percutaneous implant and ostomy method
BR302013005473S1 (pt) 2013-04-30 2014-12-23 Ostomycure As Configuração aplicada em dispositivo médico
USD827824S1 (en) 2013-04-30 2018-09-04 Ostomycure As Implant with internal porous surface structure
USD752750S1 (en) 2013-04-30 2016-03-29 Ostomycure As Implants
EP3832227A4 (de) * 2018-07-27 2021-08-04 Mitsubishi Electric Corporation Kältekreislaufvorrichtung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2801523A (en) * 1952-05-15 1957-08-06 Charles C Hansen Defrosting apparatus for refrigeration systems
US2909907A (en) * 1958-11-25 1959-10-27 Whirlpool Co Refrigerating apparatus with hot gas defrost means
US4949554A (en) * 1989-09-08 1990-08-21 Specialty Equipment Companies, Inc. Single pane, curved glass lid, frozen food merchandiser

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994020803A1 (en) * 1993-03-08 1994-09-15 Greenhalgh Refrigeration Pty Ltd Refrigeration process and apparatus
EP0699883A3 (de) * 1994-08-31 1996-07-24 Nippon Denso Co Kälteanlage
US6935127B2 (en) * 2002-08-31 2005-08-30 Samsung Electronics Co., Ltd. Refrigerator
US7370490B2 (en) * 2005-06-30 2008-05-13 Zhiming Li Air-conditioning system with full heat recovery
EP1825839A1 (de) 2006-02-28 2007-08-29 Ostomycure AS Implantat
US8647304B2 (en) 2006-02-28 2014-02-11 Ostomycure As Implant and method for its manufacture
EP2364678A1 (de) 2007-08-21 2011-09-14 Ostomycure AS Implantat
CN102003842A (zh) * 2010-11-04 2011-04-06 三花丹佛斯（杭州）微通道换热器有限公司 蒸发器和具有它的制冷系统
CN102003842B (zh) * 2010-11-04 2013-04-10 三花控股集团有限公司 蒸发器和具有它的制冷系统
CN104848497A (zh) * 2015-06-10 2015-08-19 广东志高暖通设备股份有限公司 一种空气调节器
CN105402937A (zh) * 2015-12-22 2016-03-16 广东志高暖通设备股份有限公司 一种空调系统

Also Published As

Publication number Publication date
EP0477475A3 (en) 1992-09-02
IT1244107B (it) 1994-07-05
ES2066276T3 (es) 1995-03-01
IT9041699A0 (it) 1990-09-28
DK0477475T3 (da) 1995-05-15
IT9041699A1 (it) 1992-03-28
DE69106096T2 (de) 1995-05-04
ATE116054T1 (de) 1995-01-15
DE69106096D1 (de) 1995-02-02
EP0477475B1 (de) 1994-12-21

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