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Title:
REFRIGERATING AIR CONDITIONER, OPERATION CONTROL METHOD OF REFRIGERATING AIR CONDITIONER, AND REFRIGERANT QUANTITY CONTROL METHOD OF REFRIGERATING AIR CONDITIONER
Document Type and Number:
WIPO Patent Application WO/2006/057111
Kind Code:
A1
Abstract:
A refrigerating air conditioner using, as the refrigerant, CO2, or the like, used in supercritical region, in which the quantity of the refrigerant in a radiator, which quantity contributes to efficiency of the refrigerating air conditioner, is stably and quickly controlled to enhance air conditioner efficiency. In operation where heat is used, the degree of superheat at the outlet of an evaporator (5) is controlled to a predetermined value through opening control of an expansion valve (6) provided on the upstream side of the evaporator (5) and also an expansion valve (9) is controlled such that the refrigerant in the high pressure side connection piping is a supercritical state. In this state, a flow control valve (13) is controlled to vary the concentration of refrigerant stored in a refrigerant storage container (12), thereby the quantity of refrigerant present in the radiator (10) is regulated. Furthermore, a high-pressure target value and a temperature target value at the outlet of the radiator are set, and the capacity of a compressor (3) is controlled to attain these target values and simultaneously the quantity of the refrigerant present in the radiator (10) is regulated by a refrigerant quantity regulating circuit (20).

Inventors:
UNEZAKI FUMITAKE (JP)
SAIKUSA TETSUJI (JP)
OKAZAKI TAKASHI (JP)
SAITOU MAKOTO (JP)
SHIBA HIROKUNI (JP)
NOMOTO SOU (JP)
Application Number:
PCT/JP2005/018619
Publication Date:
June 01, 2006
Filing Date:
October 07, 2005
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP (JP)
UNEZAKI FUMITAKE (JP)
SAIKUSA TETSUJI (JP)
OKAZAKI TAKASHI (JP)
SAITOU MAKOTO (JP)
SHIBA HIROKUNI (JP)
NOMOTO SOU (JP)
International Classes:
F25B1/00
Foreign References:
JP2001004235A2001-01-12
JP2002130770A2002-05-09
JP2004100979A2004-04-02
JP2003247742A2003-09-05
JPH09217974A1997-08-19
JPH0735429A1995-02-07
JP2003279174A2003-10-02
JPH09273839A1997-10-21
JPH10253203A1998-09-25
JP2001141316A2001-05-25
JP2002310519A2002-10-23
JP2002106959A2002-04-10
JP2000146322A2000-05-26
JPH0718602A1995-01-20
JP2002228282A2002-08-14
JP2000266415A2000-09-29
JP2001304714A2001-10-31
JP2001004235A2001-01-12
Other References:
See also references of EP 1818627A4
Attorney, Agent or Firm:
Kobayashi, Hisao (The 6th Central Bldg. 19-10, Toranomon 1-chom, Minato-ku Tokyo 01, JP)
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