EP2995884A1 - Réfrigérateur sans givre et son procédé de contrôle - Google Patents

Réfrigérateur sans givre et son procédé de contrôle Download PDF

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Publication number
EP2995884A1
EP2995884A1 EP14184128.8A EP14184128A EP2995884A1 EP 2995884 A1 EP2995884 A1 EP 2995884A1 EP 14184128 A EP14184128 A EP 14184128A EP 2995884 A1 EP2995884 A1 EP 2995884A1
Authority
EP
European Patent Office
Prior art keywords
condenser
evaporators
evaporator
frost
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.)
Granted
Application number
EP14184128.8A
Other languages
German (de)
English (en)
Other versions
EP2995884B1 (fr
Inventor
Matteo Luciano Vanelli
Lorenzo Bianchi
Andrea Olivani
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.)
Whirlpool Corp
Original Assignee
Whirlpool 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 Whirlpool Corp filed Critical Whirlpool Corp
Priority to EP14184128.8A priority Critical patent/EP2995884B1/fr
Publication of EP2995884A1 publication Critical patent/EP2995884A1/fr
Application granted granted Critical
Publication of EP2995884B1 publication Critical patent/EP2995884B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F25B40/00—Subcoolers, desuperheaters or superheaters
    • F25B40/02—Subcoolers
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • 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
    • F25B6/00—Compression machines, plants or systems, with several condenser circuits
    • F25B6/04—Compression machines, plants or systems, with several condenser circuits 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • 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
    • F25B2347/00—Details for preventing or removing deposits or corrosion
    • F25B2347/02—Details of defrosting cycles
    • F25B2347/021—Alternate defrosting
    • 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
    • F25B2600/2507—Flow-diverting 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
    • F25B2600/2511—Evaporator distribution valves

Definitions

  • the present invention relates to a no-frost refrigerator comprising a sequential refrigeration circuit having a condenser and at least two evaporators downstream a valve configured to direct refrigerant flow to any of the evaporators.
  • no-frost refrigerator we mean any refrigeration appliance where a flow of air is directed towards an evaporator for creating a flow of cooled air which is used to cool at least one refrigeration cavity or compartment (different from the so called “static” evaporator where there is no forced flow of air).
  • the electrical resistor used to defrost the evaporator has got a major impact on declared energy consumption, being the device with the higher absorption power in the entire appliance.
  • calrod, distributed or radiant heaters are usually provided to warm-up the evaporator, to clean it from ice when in blocked condition (with reduced efficiency as a consequence).
  • That kind of electrical heater is usually provided with a bimetal sensor, to indicate the end of defrost period.
  • the power consumption of such a heater is usually much higher than the one of the compressor itself, creating an absorption peak during defrost (that is one of the reason for the higher declared energy consumption of no-frost appliance with respect to static ones).
  • the technical solution according to the invention is suitable only for the so-called sequential thermodynamic vapor compression circuits.
  • a sequential circuit a three-way electrovalve is used to divert the refrigerant flow to alternatively either one or the other evaporator or to both of them, which are linked in parallel configuration downstream the condenser.
  • the solution according to the invention makes use of an additional condenser coil, presents upstream and in series with the condenser and wrapped around the evaporator to be defrosted (in a hybrid appliance, the evaporator of the freezer).
  • the coil is fed with refrigerant liquid at high temperature only when required, thanks to an second three-way electrovalve (eventually driven even a bimetal sensor), which normally manages the bypass of the additional coil itself.
  • an second three-way electrovalve (eventually driven even a bimetal sensor), which normally manages the bypass of the additional coil itself.
  • a refrigeration circuit 10 comprises a compressor 12, a condenser 14, a first three-way valve 16 for directing the refrigerant flow towards a first evaporator 18 of a freezer compartment FC or towards a second evaporator 20 of a refrigeration compartment RC or to both evaporators.
  • the circuit 10 comprises, upstream the condenser 14, a second three-way valve 22 for diverting the refrigerant flow towards an auxiliary condenser loop 24 in series with the condenser 14 and carrying a portion 24a in heat exchange relationship with the evaporator 18 of the freezer compartment FC.
  • the circuit 10 comprises also capillary tubes 26 and 28 upstream the first evaporator 18 and the second evaporator 20 respectively, as well as accumulators 30 and 32 downstream the evaporators, such accumulators assuring a correct balance of the refrigerant load when working conditions change.
  • the first valve 16 is driven by the electronic control unit (not shown) according to the actual temperatures in the freezer FC and in the refrigeration chamber RC and it can also direct the refrigerant flow to both evaporators 18 and 20 simultaneously.
  • the second valve 22 is moved to the "D" position in order to direct hot fluid in the auxiliary condenser loop 24 towards the heat exchanger 24a.
  • the first valve 16 is driven by the control unit in the "B" position so that the refrigeration compartment is still cooled.
  • the first valve 16 cannot be maintained in a configuration where both evaporators are fed with refrigerant fluid.
  • the auxiliary condenser loop 24 is activated, the compressor 12 is maintained in its "on" configuration.
  • the fact that in the example shown in the figures the auxiliary condenser loop is placed upstream the condenser 14 is not to be intended as a limitation of the present invention.
  • An auxiliary condenser loop positioned downstream the condenser could have different advantages but still having a beneficial effect on the thermodynamic cycle.
  • An upstream position gives as a main advantage a decrease of the average condensation temperature, with an increase of the compression efficiency, while a downstream position gives a sub-cooling of refrigerant fluid upstream the capillary tube 28 of the fresh food compartment RC with an increase of cooling capacity and a decrease of refrigerant flow noises.
  • the portion 24a of the auxiliary condenser loop 24 and the first evaporator 18 are preferably made as a single component, preferably made of metal, where the first evaporator 18 and said heat exchange portion 24a of the auxiliary condenser loop 24 are integrated. Roll-bond technology can be used for producing such integrated heat exchanges which is positioned inside the freezer compartment FC.
  • the embodiment shown in figure 2 refers to a fully no-frost refrigerator where either the evaporator 18 of the freezer compartment FC and the evaporator 20 of the refrigeration compartment RC are no-frost evaporators.
  • the major different between the solution of figure 1 and figure 2 is the use of a four-way valve 33 which can direct the refrigerant flow, for instance upstream the condenser 14, toward a first auxiliary condenser loop 24 substantially identical to the auxiliary condenser loop of the first embodiment, or to a second auxiliary condenser loop 34 which directs hot gas towards a portion 34a in heat-exchange relationship with the second evaporator 20 of the refrigeration compartment RC.
  • the first valve 16 when a defrost cycle is started, diverts the refrigerant flow towards the evaporator which is not subjected to defrost.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Defrosting Systems (AREA)
EP14184128.8A 2014-09-09 2014-09-09 Réfrigérateur hybride non givrant Active EP2995884B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14184128.8A EP2995884B1 (fr) 2014-09-09 2014-09-09 Réfrigérateur hybride non givrant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14184128.8A EP2995884B1 (fr) 2014-09-09 2014-09-09 Réfrigérateur hybride non givrant

Publications (2)

Publication Number Publication Date
EP2995884A1 true EP2995884A1 (fr) 2016-03-16
EP2995884B1 EP2995884B1 (fr) 2020-12-30

Family

ID=51492262

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14184128.8A Active EP2995884B1 (fr) 2014-09-09 2014-09-09 Réfrigérateur hybride non givrant

Country Status (1)

Country Link
EP (1) EP2995884B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3127554A1 (fr) * 2021-09-30 2023-03-31 Lemasson Procédé de régulation du fonctionnement d'une pompe à chaleur équipée de deux échangeurs évaporateurs et d'un échangeur condenseur

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01184378A (ja) * 1988-01-18 1989-07-24 Sakai Reitou Kogyo Kk 冷蔵・冷東庫の冷媒を利用する霜取り装置
US6931880B2 (en) 2000-09-01 2005-08-23 Sinvent As Method and arrangement for defrosting a vapor compression system
US20070119196A1 (en) 2005-11-28 2007-05-31 Wellman Keith E Sequential hot gas defrost method and apparatus
DE202008005337U1 (de) * 2008-04-17 2009-08-20 Liebherr-Hausgeräte Lienz Gmbh Kühl- und/oder Gefriergerät
EP2636976A1 (fr) * 2012-03-09 2013-09-11 Whirlpool Corporation Réfrigérateur hybride et son procédé de commande

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01184378A (ja) * 1988-01-18 1989-07-24 Sakai Reitou Kogyo Kk 冷蔵・冷東庫の冷媒を利用する霜取り装置
US6931880B2 (en) 2000-09-01 2005-08-23 Sinvent As Method and arrangement for defrosting a vapor compression system
US20070119196A1 (en) 2005-11-28 2007-05-31 Wellman Keith E Sequential hot gas defrost method and apparatus
DE202008005337U1 (de) * 2008-04-17 2009-08-20 Liebherr-Hausgeräte Lienz Gmbh Kühl- und/oder Gefriergerät
EP2636976A1 (fr) * 2012-03-09 2013-09-11 Whirlpool Corporation Réfrigérateur hybride et son procédé de commande

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3127554A1 (fr) * 2021-09-30 2023-03-31 Lemasson Procédé de régulation du fonctionnement d'une pompe à chaleur équipée de deux échangeurs évaporateurs et d'un échangeur condenseur

Also Published As

Publication number Publication date
EP2995884B1 (fr) 2020-12-30

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