(19)
(11) EP 2 068 099 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
15.02.2012 Bulletin 2012/07

(43) Date of publication A2:
10.06.2009 Bulletin 2009/24

(21) Application number: 08020972.9

(22) Date of filing: 03.12.2008
(51) International Patent Classification (IPC): 
F25B 1/10(2006.01)
F25B 31/00(2006.01)
F25B 5/00(2006.01)
F25B 5/02(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated Extension States:
AL BA MK RS

(30) Priority: 05.12.2007 JP 2007314484

(71) Applicants:
  • Hitachi Ltd.
    Chiyoda-ku Tokyo 100-8280 (JP)
  • Hitachi Plant Technologies, Ltd.
    Tokyo 170-8466 (JP)

(72) Inventors:
  • Shibata, Takanori
    Tokyo 100-8220 (JP)
  • Bannai, Masaaki
    Tokyo 100-8220 (JP)
  • Fukushima, Yasuo
    Tokyo 170-8466 (JP)
  • Horitsugi, Mutsumi
    Tokyo 100-8220 (JP)

(74) Representative: MERH-IP Matias Erny Reichl Hoffmann 
Paul-Heyse-Strasse 29
80336 München
80336 München (DE)

   


(54) Refrigeration cycle system, natural gas liquefaction plant, heat pump system, and method for retrofitting refrigeration cycle system


(57) A refrigeration cycle system is provided, comprising a plurality of compressors (3,4,5) for compressing a refrigerant that is used to cool a medium (10), one of the compressors being a low pressure compressor (3), another one of the compressors being a high pressure compressor (5); a condenser (6) for cooling and condensing the refrigerant compressed by the plurality of compressors (3,4,5); a reservoir (7) for receiving the refrigerant condensed by the condenser (6); an expansion mechanism (9) for expanding and cooling the refrigerant supplied from the reservoir (7); an evaporator (9) for evaporating the refrigerant cooled by the expansion mechanism (8) by means of the medium (10) to generate a refrigerant to be supplied to the plurality of compressors (3,4,5); and an intercooler (15,15A,61) that is provided between the low pressure compressor (3) and the high pressure compressor (5) and adapted to cool the refrigerant supplied from the low pressure compressor (3) by means of the refrigerant supplied from the expansion mechanism (8) so as to generate a refrigerant to be supplied to the high pressure compressor (5).







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