(19)
(11) EP 1 717 528 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
03.08.2011 Bulletin 2011/31

(43) Date of publication A2:
02.11.2006 Bulletin 2006/44

(21) Application number: 06008291.4

(22) Date of filing: 21.04.2006
(51) International Patent Classification (IPC): 
F25B 9/00(2006.01)
 F25B 40/00(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK YU

(30) Priority: 25.04.2005 JP 2005126995

(71) Applicant: Panasonic Corporation
Kadoma-shi Osaka 571-8501 (JP)

(72) Inventors:
  • Nakatani, Kazuo
    Chuo-ku Osaka-shi Osaka 540-6319 (JP)
  • Okaza, Nohiro
    Chuo-ku Osaka-shi Osaka 540-6319 (JP)
  • Hirano, Hideo
    Chuo-ku Osaka-shi Osaka 540-6319 (JP)
  • Watanabe, Yasushi
    Chuo-ku Osaka-shi Osaka 540-6319 (JP)

(74) Representative: Eisenführ, Speiser & Partner 
Postfach 31 02 60
80102 München
80102 München (DE)

   


(54) Refrigeration cycle apparatus


(57) In a refrigeration cycle apparatus in which carbon dioxide is used as refrigerant and refractory oil is used as lubricating oil in a compressor, it is an object of the present invention to reduce influence of adhesion of lubricating oil to the internal heat exchanger, and to enhance the heat exchanging efficiency of the internal heat exchanger.
A refrigeration cycle apparatus in which a compressor 11, a radiator 12, an expansion valve 13 and an evaporator 14 are connected to one another through tubes, said refrigeration cycle apparatus comprises an internal heat exchanger 30 for exchanging heat between a high pressure refrgerant wich flows out from said radiator 12 and low pressure refrigerant which flows out from said evaporator 14, wherein carbon dioxide is used as the refrigerant, refractory oil is used as lubricating oil in said compressor 11, said internal heat exchanger 30 comprises a first heat exchanger tube 31 through which the high pressure refrigerant in a supercritical region flows and a second heat exchanger tube 32 through which the low pressure refrigerant flows , said first heat exchanger tube 31 is disposed in said second heat exchanger tube 32.







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