EP2309206A1 - Gefrierzyklus - Google Patents

Gefrierzyklus Download PDF

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Publication number
EP2309206A1
EP2309206A1 EP09742690A EP09742690A EP2309206A1 EP 2309206 A1 EP2309206 A1 EP 2309206A1 EP 09742690 A EP09742690 A EP 09742690A EP 09742690 A EP09742690 A EP 09742690A EP 2309206 A1 EP2309206 A1 EP 2309206A1
Authority
EP
European Patent Office
Prior art keywords
refrigerant
refrigeration cycle
superheat
evaporator
degrees
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
EP09742690A
Other languages
English (en)
French (fr)
Other versions
EP2309206B1 (de
EP2309206A4 (de
Inventor
Yuuichi Matsumoto
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.)
Sanden Corp
Original Assignee
Sanden 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 Sanden Corp filed Critical Sanden Corp
Publication of EP2309206A1 publication Critical patent/EP2309206A1/de
Publication of EP2309206A4 publication Critical patent/EP2309206A4/de
Application granted granted Critical
Publication of EP2309206B1 publication Critical patent/EP2309206B1/de
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
    • F25B1/00—Compression machines, plants or systems with non-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
    • 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
    • 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
    • F25B2400/12—Inflammable refrigerants
    • F25B2400/121—Inflammable refrigerants using R1234
    • 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
    • F25B2400/18—Refrigerant conversion
    • 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
    • F25B2600/21—Refrigerant outlet evaporator temperature

Definitions

  • the present invention relates to a refrigeration cycle, and specifically relates to a refrigeration cycle which can be efficiently operated when a specific new-type refrigerant is used.
  • a refrigeration cycle used in an automotive air conditioning system, etc. has basic configuration which is shown in Fig. 1 , for example.
  • refrigeration cycle 1 has compressor 2 for compressing refrigerant, condenser 3 for condensing compressed refrigerant, expansion valve 4 as a pressure reduction and expansion means for reducing in pressure and expanding condensed refrigerant, and evaporator 5 for evaporating pressure-reduced and expanded refrigerant, where the refrigerant is circulated in refrigeration cycle 1 as changing its state. It is known to be effective for improving the refrigeration performance that such refrigeration cycle 1 is operated while the refrigerant at the outlet side of evaporator 5 is kept in a condition superheated with respect to its saturation curve.
  • Characteristics as shown in Fig. 2 may be basically expressed as general characteristics of a refrigeration cycle which is operated as keeping the refrigerant in a superheat condition at the outlet side of the evaporator, regardless of the type of refrigerant.
  • the concrete characteristics having a concrete numeric value may depend greatly on the type of refrigerant.
  • R134a is a refrigerant which is typical at present, however, research and development to find a new-type refrigerant are being performed in order to improve Global Warming Potential (GWP), as disclosed in non-patent document 1.
  • GWP Global Warming Potential
  • R1234yf has been announced recently as a new refrigerant aiming at such an improvement, and it is becoming possible that it is examined and studied for applying to refrigeration cycle used for an automotive air conditioning system, etc.
  • Prior art documents Non-patent documents
  • Non-patent document 1 Refrigeration, Vol. 83, No. 965, March issue, 2008
  • the refrigerant condition is generally controlled around 5 superheat degrees at the outlet side of the evaporator, and the operation, regardless of high load and low load, is performed in a condition around 5 degrees superheat.
  • a condition of 5 degrees superheat has been configured for the following reasons. (1) The condition of 5 superheat degrees is regarded as being close to the requisite minimum to achieve a target refrigeration gasification state at the outlet side of the evaporator. (2) If the condition is set as substantially higher than 5 degrees superheat, the temperature of refrigerant discharged from the evaporator might exceed a certain level as causing deterioration of refrigerant oil contained in the refrigerant.
  • refrigerant flow rate for an operation using R1234yf has to be increased to achieve a refrigeration performance same as that for an operation using R134a as a conventional refrigerant.
  • the refrigerant flow rate has to be increased by increasing the rotational speed of compressor 2, however, it may cause an increase of the power consumption of compressor 2, and consequently refrigeration coefficient of performance may be reduced, so that the operating condition becomes undesirable on efficiency.
  • an object of the present invention is to provide a refrigeration cycle which can be operated with a high efficiency even if the refrigerant has been replaced with R1234yf as new-type refrigerant.
  • a refrigeration cycle according to the present invention is a refrigeration cycle comprising a compressor for compressing refrigerant, a condenser for condensing compressed refrigerant, a pressure reduction and expansion means for reducing in pressure and expanding condensed refrigerant, and an evaporator for evaporating pressure-reduced and expanded refrigerant, characterized in that R1234yf is used as refrigerant for the refrigeration cycle, and the refrigeration cycle is operated so that the refrigerant at an exit side of the evaporator is controlled in a superheated condition, and the superheated condition is controlled in a range of 5 to 16 degrees of superheat.
  • the refrigeration cycle according to the present invention may be operated at 5 -16 superheat degrees of refrigerant at the exit side of the evaporator, and more preferably, is operated at in a range of 10 - 16 superheat degrees thereof as keeping the superheat degree as high as possible, in order to achieve the deterioration prevention of the refrigerant oil by suppressing the discharged refrigerant temperature rise. Namely, if attention is focused on the discharged refrigerant temperature shown in Fig.
  • the above-described operating condition of 10 superheat degrees is comparable with the operating condition around 5 superheat degrees under low load in R134a case
  • the above-described operating condition of 16 superheat degrees is comparable with the operating condition around 5 superheat degrees under high load in R134a case. Therefore, the operating condition of 10 - 16 superheat degrees keeps the discharged refrigerant temperature at the same level to any load condition in R134a case, so that the lower limit for operating condition of superheat degree can be kept as high as possible.
  • the operating condition range of superheat degree with lower limit of 10 degrees does not overlap the conventional condition range around 5 superheat degrees in R134a case at all.
  • the refrigeration cycle according to the present invention whose basic configuration is shown in Fig. 1 , preferably has means for elevating the degree of superheat of the refrigerant at the exit side of the evaporator, as compared with a case where R134a is used as refrigerant.
  • the means for elevating the superheat degree may be provided in order to meet the operating condition of superheat degree higher than around 5 superheat degrees for the R134a case.
  • conventionally known means and mechanisms can be applied for such a means for elevating the degree of superheat.
  • a liquid/gas heat exchanger such as an internal heat exchanger which exchange heat between high-pressure side of the condenser outlet and low-pressure side of the evaporator outlet
  • the evaporation tube inside the evaporator may be extended, a so-called sensible heat exchanger may be provided, or the set value of the pressure-reduction/expansion means such as expansion valve may be altered.
  • Such a refrigeration cycle according to the present invention is basically applicable to any refrigeration cycle which aims to use the new-type refrigerant R1234yf, and is specifically suitable to a refrigeration cycle used in an automotive air conditioning system which is required to achieve efficient operation and to be highly durable for a long term by preventing the refrigerant oil from deterioration.
  • the refrigeration cycle according to the present invention makes it possible that when the refrigerant is replaced to the new-type refrigerant R1234yf, the improvement of coefficient of performance (COP) can be greatly achieved and the discharged refrigerant temperature can be properly kept from rising as preventing from the deterioration of the refrigerant oil in refrigerant, so that refrigeration cycle can be operated efficiently as a whole.
  • COP coefficient of performance
  • FIG. 1 The basic configuration of equipments provided in a refrigeration cycle of the present invention can be the one as shown in Fig. 1 .
  • refrigeration cycle 1 has compressor 2 for compressing refrigerant, condenser 3 for condensing compressed refrigerant, expansion valve 4 as a pressure-reduction/expansion means for reducing in pressure and expanding condensed refrigerant, and evaporator 5 for evaporating refrigerant which is pressure-reduced and expanded, which is operated as keeping refrigerant superheated at the exit side of evaporator 5 in refrigeration cycle 1 so as to improve refrigeration performance.
  • the Mollier diagram in Fig. 2 shows a basic cycle where the refrigerant changes in state as the superheat degree is given.
  • Fig. 3 shows that the COP increase rate rises in both R134a case and R1234yf case when increasing the superheat degree of refrigerant at the exit side of the evaporator, and that the increase rate of the R1234yf case is relatively higher. Therefore in the R1234yf case, the more superior coefficient of performance (COP) can be obtained by keeping high superheat degree of refrigerant at the exit side of the evaporator.
  • COP coefficient of performance
  • the conventional set value of superheat degree in the R134a case has been around 5 deg regardless of loads, as described above. As shown in Fig.
  • a desirable range in the R1234yf case can be defined by the superheat degree of refrigerant at the exit side of the evaporator in the intersection where the line of discharged refrigerant temperature value in the R134a case of each condition intersects the characteristic line of the R1234yf, in order to keep the discharged refrigerant temperature at the same level between the R1234yf case and the R134a case, as suppressing the discharged refrigerant temperature increase.
  • the refrigeration cycle according to the present invention is applicable to any refrigeration cycle, and specifically, is suitable as a refrigeration cycle used in an automotive air conditioning system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Lubricants (AREA)
EP09742690.2A 2008-05-08 2009-04-27 Gefrierzyklus Active EP2309206B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008122301A JP2009270775A (ja) 2008-05-08 2008-05-08 冷凍サイクル
PCT/JP2009/058292 WO2009136566A1 (ja) 2008-05-08 2009-04-27 冷凍サイクル

Publications (3)

Publication Number Publication Date
EP2309206A1 true EP2309206A1 (de) 2011-04-13
EP2309206A4 EP2309206A4 (de) 2011-10-12
EP2309206B1 EP2309206B1 (de) 2013-08-14

Family

ID=41264621

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09742690.2A Active EP2309206B1 (de) 2008-05-08 2009-04-27 Gefrierzyklus

Country Status (5)

Country Link
US (1) US20110056236A1 (de)
EP (1) EP2309206B1 (de)
JP (1) JP2009270775A (de)
CN (1) CN102016448A (de)
WO (1) WO2009136566A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011247482A (ja) * 2010-05-27 2011-12-08 Panasonic Corp 冷凍装置および冷暖房装置
US20200333056A1 (en) * 2018-03-09 2020-10-22 Mitsubishi Electric Corporation Refrigeration cycle apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5392612A (en) * 1984-08-08 1995-02-28 Richard H. Alsenz Refrigeration system having a self adjusting control range
FR2905633A1 (fr) * 2006-09-08 2008-03-14 Valeo Systemes Thermiques Boucle de climatisation d'un vehicule automobile dont le fluide refrigerant est a base de 1,1,1,2-tetrafluoroproprene et de trifluoroiodomethane

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3360530B2 (ja) * 1996-06-28 2002-12-24 ダイキン工業株式会社 空気調和機の制御装置
JP4078812B2 (ja) * 2000-04-26 2008-04-23 株式会社デンソー 冷凍サイクル装置
US6293108B1 (en) * 2000-06-30 2001-09-25 Vortex Aircon Regenerative refrigeration system with mixed refrigerants
EP1489367B1 (de) * 2002-03-28 2011-08-24 Panasonic Corporation Kühlkreislaufvorrichtung
DE10247262A1 (de) * 2002-10-10 2004-04-22 Behr Gmbh & Co. Verfahren zur Verdampfungstemperaturregelung bei einer Klimaanlage
JP2006177632A (ja) * 2004-12-24 2006-07-06 Denso Corp 冷凍サイクル
JP2007315663A (ja) * 2006-05-25 2007-12-06 Sanden Corp 冷凍装置
DE102007015185B4 (de) * 2007-03-29 2022-12-29 Valeo Klimasysteme Gmbh Klimaanlage für ein Kraftfahrzeug
JP2008281326A (ja) * 2007-04-11 2008-11-20 Calsonic Kansei Corp 冷凍装置及び該冷凍装置に用いる熱交換器
JP5318099B2 (ja) * 2008-06-13 2013-10-16 三菱電機株式会社 冷凍サイクル装置、並びにその制御方法
CN102066852B (zh) * 2008-06-16 2014-03-05 三菱电机株式会社 非共沸混合制冷剂及冷冻循环装置
US20100313582A1 (en) * 2009-06-10 2010-12-16 Oh Jongsik High efficiency r744 refrigeration system and cycle

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5392612A (en) * 1984-08-08 1995-02-28 Richard H. Alsenz Refrigeration system having a self adjusting control range
FR2905633A1 (fr) * 2006-09-08 2008-03-14 Valeo Systemes Thermiques Boucle de climatisation d'un vehicule automobile dont le fluide refrigerant est a base de 1,1,1,2-tetrafluoroproprene et de trifluoroiodomethane

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2009136566A1 *

Also Published As

Publication number Publication date
JP2009270775A (ja) 2009-11-19
EP2309206B1 (de) 2013-08-14
EP2309206A4 (de) 2011-10-12
US20110056236A1 (en) 2011-03-10
WO2009136566A1 (ja) 2009-11-12
CN102016448A (zh) 2011-04-13

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