EP2857778A1 - Réfrigérateur avec mélange non azéotropique de réfrigérants d'hydrocarbures - Google Patents

Réfrigérateur avec mélange non azéotropique de réfrigérants d'hydrocarbures Download PDF

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Publication number
EP2857778A1
EP2857778A1 EP13187230.1A EP13187230A EP2857778A1 EP 2857778 A1 EP2857778 A1 EP 2857778A1 EP 13187230 A EP13187230 A EP 13187230A EP 2857778 A1 EP2857778 A1 EP 2857778A1
Authority
EP
European Patent Office
Prior art keywords
evaporator
refrigerator according
refrigerant
heat exchanger
tube
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.)
Withdrawn
Application number
EP13187230.1A
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German (de)
English (en)
Inventor
Enzo Rivis
Marco Gavioli
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 EP13187230.1A priority Critical patent/EP2857778A1/fr
Priority to US14/482,181 priority patent/US20150096325A1/en
Publication of EP2857778A1 publication Critical patent/EP2857778A1/fr
Withdrawn legal-status Critical Current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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
    • F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
    • F25D11/022—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures with two or more evaporators
    • 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
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/005—Compression machines, plants or systems with non-reversible cycle of the single unit type
    • 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
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/37—Capillary tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F28D15/04—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure
    • 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
    • F25B2400/05—Compression system with heat exchange between particular parts of the system
    • F25B2400/052—Compression system with heat exchange between particular parts of the system between the capillary tube and another part of the refrigeration 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
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
    • F25B9/006—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant containing more than one component

Definitions

  • the present invention relates to a refrigerator with a refrigerant circuit using a non-azeotropic mixture of hydrocarbons refrigerants. More particularly, the present invention relates to a refrigerator in which said refrigerant circuit comprises a compressor, a condenser, an expansion device, a first evaporator downstream the expansion device, a second evaporator downstream the first evaporator, a first heat exchanger to cause heat exchange between refrigerant downstream the condenser and upstream the first evaporator, on one side, and refrigerant downstream the first evaporator and upstream the second evaporator, on the other side, and a second heat exchanger to cause heat exchange between refrigerant downstream the condenser and upstream said first heat exchanger, on one side, and refrigerant downstream the second evaporator and upstream the compressor, on the other side.
  • said refrigerant circuit comprises a compressor, a condenser, an expansion device, a first evaporator downstream the expansion device
  • This kind of refrigerator known also as “dual evaporator” or “sequential evaporator” type refrigerator, uses a non-azeotropic mixture of two different refrigerants, for instance propane (R-290) and n-butane (R-600), which has an appropriate gliding temperature difference (GTD) during evaporation and condensation phases.
  • GTD gliding temperature difference
  • With a refrigeration cycle using the above mixture known also as Lorenz-Meutzner cycle, it is possible to have identical or at least similar energy saving performances of a dual evaporator refrigeration circuit using a mono-component refrigerant and a by-pass two-circuit cycle, where a 3-way electrovalve is used.
  • a refrigerator of the type mentioned at the beginning of the description is disclosed by US 5 207 077 and EP 2 592 366 .
  • the expansion device is placed immediately upstream the first evaporator, i.e. the low-temperature evaporator.
  • the expansion device is identified in the drawing as an expansion valve, while in EP 2592366 the expansion device is a capillary tube arranged at the side of the first evaporator.
  • the presence of the valve does increase the overall cost of the appliance, and it may create problem of condensation on suction tube.
  • the optimum capillary tube length is of the order of 10 - 15 m if similar energy consumption performances of a bypass two-circuit cycle are to be obtained.
  • the capillary tube is used as one side of both heat exchangers.
  • the capillary tube is used externally to the other tubes of the refrigerant circuit, and the refrigerant flow in the capillary tube is in counter flow with reference to the refrigerant flow in the tube of the refrigerant circuit.
  • the capillary tube is used internally to the other tube.
  • the capillary tube has a length comprised between 2.5 and 5 meters, and an internal diameter comprised between 0,6 and 0,8 mm.
  • capillary tube with a reduced length does reduce the overall cost of the appliance and increases the simplicity of the layout of the refrigerant circuit, with related advantages in term of reliability and reduced overall volume of the circuit.
  • the refrigerant circuit comprises a compressor 10, a condenser 12, usually placed on back wall of the refrigerator, cooled by natural convection or with forced air, a drier 14 as normally used on a domestic refrigerator / freezer appliance.
  • the circuit Downstream the drier, the circuit comprises a capillary tube 16 of from 2.5 to 5 m (depending on the total volume of the cells, the type of compressor etc.), with an internal diameter comprised between 0.60 and 0.80mm.
  • the circuit comprises a first heat exchanger 18 and a second heat exchanger 20.
  • the first heat exchanger 18 present a first side made by a capillary tube portion 16a in contact with a portion 22 of the circuit tube between first or low temperature evaporator 17 (placed in the freezer compartment - not shown) and second or high temperature evaporator 19 (placed in the fridge compartment - not shown).
  • the section of such heat exchanger is shown in figure 2 , and applicant has determined through experimental tests that the length of this tube/tube heat exchanger is preferably between 0,5 and 1 m.
  • Internal diameter of the suction tube 22 is preferably comprised between 5 and 8 mm.
  • the capillary tube portion 16a and the portion 22 of the refrigerant circuit tube are in contact one with another, and they are covered by a layer of aluminum foil 23 which may be a self-adhesive aluminum tape which assures a correct placement of the two parts of the heat exchanger and helps increasing the thermal efficiency thereof.
  • the capillary tube 16a is wrapped around the tube 22 of the refrigerant circuit without use of any aluminum layer.
  • the second heat exchanger 20 is similarly composed of a capillary tube portion 16b and a portion 24 of suction tube upstream the compressor 10.
  • the length of such double-pipe heat exchanger 20, particularly in the embodiment shown in figure 2 is preferably comprised between 1,5 and 3 m.
  • Internal diameter of the suction tube 24 is preferably comprised between 5 and 8 mm.
  • the section of the second heat exchanger 20 is identical to the section of the first heat exchanger 18 shown in figure 2 or 3 .
  • the applicant has found that the same evaporator used in refrigerators with the bypass two-circuit cycle (where aR600a is used as refrigerant) can be adopted.
  • the second evaporator 19 ridge Evaporator - high temperature
  • an increased surface of about 10 / 30 % vs. the surface of an evaporator used in a bypass two-circuit cycle is beneficial for energy saving performances.
  • capillary 16 also as a second heat exchanger tube 16b improves the sub-cooling of the tube connection from second evaporator 19 (at high temperature) and compressor 10.
  • the solution according to the invention can be applied to direct cooled evaporator products (static evaporators in freezer and fridge compartments) and hybrid products (no frost freezer and static fridge).
  • the main benefits obtained applying the cycle according to the invention on a bottom mount freezer built-in product are as follows: a) Energy saving Refrigerator / Freezer Hybrid Refrigerator Freezer Direct Cooled Reference using R600a (Wh/24h) 920 (*) 860 (*) Result obtained using mixture R290/R600 (20/80) (Wh/24h) 814 (*) 770 (*) Energy Benefit 11,5 % 10,5% (*) According procedure EN 62552 Therefore an energy reduction around 11% has been obtained on both typologies of products.
  • Low temperatures in freezer have not only a positive impact on energy saving performances, but they improve the freezing ability of products: in term of capacity (more quantity can be frozen on product in the same time) and in quality (faster freezing improves the quality of food frozen).

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
EP13187230.1A 2013-10-03 2013-10-03 Réfrigérateur avec mélange non azéotropique de réfrigérants d'hydrocarbures Withdrawn EP2857778A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP13187230.1A EP2857778A1 (fr) 2013-10-03 2013-10-03 Réfrigérateur avec mélange non azéotropique de réfrigérants d'hydrocarbures
US14/482,181 US20150096325A1 (en) 2013-10-03 2014-09-10 Refrigerators with a non-azeotropic mixtures of hydrocarbons refrigerants

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13187230.1A EP2857778A1 (fr) 2013-10-03 2013-10-03 Réfrigérateur avec mélange non azéotropique de réfrigérants d'hydrocarbures

Publications (1)

Publication Number Publication Date
EP2857778A1 true EP2857778A1 (fr) 2015-04-08

Family

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EP13187230.1A Withdrawn EP2857778A1 (fr) 2013-10-03 2013-10-03 Réfrigérateur avec mélange non azéotropique de réfrigérants d'hydrocarbures

Country Status (2)

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US (1) US20150096325A1 (fr)
EP (1) EP2857778A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3073210A1 (fr) * 2015-03-27 2016-09-28 Whirlpool Corporation Réfrigérateur avec une efficacité

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017067035A1 (fr) * 2015-10-21 2017-04-27 合肥华凌股份有限公司 Ensemble récepteur de liquide pour système frigorifique, et système frigorifique et congélateur comportant ledit ensemble
US10712073B2 (en) * 2017-03-01 2020-07-14 Haier Us Appliance Solutions, Inc. Ternary natural refrigerant mixture that improves the energy efficiency of a refrigeration system
CN110094922B (zh) * 2019-05-17 2021-07-13 广州美的华凌冰箱有限公司 制冷设备
KR20210022932A (ko) * 2019-08-21 2021-03-04 엘지전자 주식회사 비공비혼합냉매를 사용하는 냉동시스템
TR202013573A2 (tr) * 2020-08-27 2022-03-21 Arçeli̇k Anoni̇m Şi̇rketi̇ Kombi̇ne kondenser i̇çeren soğutucu ci̇haz

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2143014A (en) * 1983-05-16 1985-01-30 Hotpoint Ltd Refrigerator/freezer units
US5207077A (en) 1992-03-06 1993-05-04 The University Of Maryland Refrigeration system
JP2001201196A (ja) * 2000-01-19 2001-07-27 Toshiba Corp 冷蔵庫
DE102009001677A1 (de) * 2009-03-19 2010-09-23 BSH Bosch und Siemens Hausgeräte GmbH Kältegerät, Drosselrohr für ein Kältegerät und Verfahren zu dessen Herstellung
EP2592366A2 (fr) 2011-11-08 2013-05-15 Samsung Electronics Co., Ltd Cycle de frigorigène mixte non azéotrope et réfrigérateur ainsi équipé

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6370908B1 (en) * 1996-11-05 2002-04-16 Tes Technology, Inc. Dual evaporator refrigeration unit and thermal energy storage unit therefore
EP1782000A4 (fr) * 2004-07-09 2007-10-10 Junjie Gu Systeme de refrigeration
JP5128424B2 (ja) * 2008-09-10 2013-01-23 パナソニックヘルスケア株式会社 冷凍装置
EP2586853A1 (fr) * 2010-06-24 2013-05-01 Asahi Glass Company, Limited Huile de base d'huile lubrifiante pour réfrigérant hydrocarboné et composition d'huile lubrifiante la contenant

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2143014A (en) * 1983-05-16 1985-01-30 Hotpoint Ltd Refrigerator/freezer units
US5207077A (en) 1992-03-06 1993-05-04 The University Of Maryland Refrigeration system
JP2001201196A (ja) * 2000-01-19 2001-07-27 Toshiba Corp 冷蔵庫
DE102009001677A1 (de) * 2009-03-19 2010-09-23 BSH Bosch und Siemens Hausgeräte GmbH Kältegerät, Drosselrohr für ein Kältegerät und Verfahren zu dessen Herstellung
EP2592366A2 (fr) 2011-11-08 2013-05-15 Samsung Electronics Co., Ltd Cycle de frigorigène mixte non azéotrope et réfrigérateur ainsi équipé

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Performance optimization of a Lorenz- Meutzner cycle charged with hydrocarbon mixtures for a domestic refrigerator-freezer", IJR, vol. 1, no. 35, pages 36 - 46
WON JAE YOON ET AL: "Performance optimization of a LorenzMeutzner cycle charged with hydrocarbon mixtures for a domestic refrigerator-freezer", INTERNATIONAL JOURNAL OF REFRIGERATION, ELSEVIER, PARIS, FR, vol. 35, no. 1, 28 September 2011 (2011-09-28), pages 36 - 46, XP028336834, ISSN: 0140-7007, [retrieved on 20111006], DOI: 10.1016/J.IJREFRIG.2011.09.014 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3073210A1 (fr) * 2015-03-27 2016-09-28 Whirlpool Corporation Réfrigérateur avec une efficacité

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