To provide a refrigeration air conditioner which prevents oil unevenness and enlargement of the unit size and achieves high efficiency with a compact structure even when being formed by a refrigeration cycle using three or more compressors.
A refrigeration air conditioner includes: a first refrigeration cycle having a first compressor and a first decompressor; a second refrigeration cycle having a second compressor and a second decompressor; a third refrigeration cycle having a third compressor and a third decompressor; a fourth refrigeration cycle having a fourth compressor and a fourth decompressor; a first heat exchanger for conducting heat exchange between a heat medium and refrigerants of the first refrigeration cycle and the second refrigeration cycle; and a second heat exchanger for conducting heat exchange between the heat medium which has been subject to the heat exchange in the first heat exchanger and refrigerants of the third refrigeration cycle and the fourth refrigeration cycle.
SUMIDA YOSHIHIRO
OKAZAKI TAKASHI
SAITO MAKOTO
KATO HISAHIRA
FUKUI TAKASHI
JP2008175476A | 2008-07-31 | |||
JP2004340533A | 2004-12-02 | |||
JPS54110844U | 1979-08-04 | |||
JPH04350468A | 1992-12-04 | |||
JP2004239539A | 2004-08-26 | |||
JP2005283037A | 2005-10-13 | |||
JP2003106712A | 2003-04-09 | |||
JP2002250540A | 2002-09-06 | |||
JP2005147480A | 2005-06-09 | |||
JPH109693A | 1998-01-16 | |||
JPS55134254A | 1980-10-18 | |||
JP2007198693A | 2007-08-09 | |||
JP2007187353A | 2007-07-26 | |||
JPS5075754U | 1975-07-02 |
US20020092318A1 | 2002-07-18 |