Air-conditioner having a dual-refrigerant cycle

Details Air-conditioner having a dual-refrigerant cycle Air-conditioner having a dual-refrigerant cycle

2005-10-04

2008-12-16

Tapolcai, William E (Department: 3744)

Refrigeration

Reversible, i.e., heat pump

With flow control or compressor details

C062S335000

Reexamination Certificate

active

07464563

ABSTRACT:
An air-conditioner having a dual-refrigerant cycle includes a primary refrigerant circuit heat-exchanged with outdoor air; a secondary refrigerant circuit heat-exchanged with indoor air to perform either a cooling operation or a heating operation; and a heat exchange unit disposed between the primary refrigerant circuit and the secondary refrigerant circuit to perform heat exchange therebetween, wherein the secondary refrigerant circuit includes a compressor for compressing a refrigerant circulating in the secondary refrigerant circuit. A condensing pressure of the primary refrigerant circuit is lowered during the hating operation and an evaporation pressure of the primary refrigerant circuit is increased to thereby enhance efficiency of the air-conditioner.

REFERENCES:
patent: 4104890 (1978-08-01), Iwasaki
patent: 4149389 (1979-04-01), Hayes et al.
patent: 4157649 (1979-06-01), Bussjager et al.
patent: 4949547 (1990-08-01), Shimizu
patent: 0675331 (1995-10-01), None
patent: 0747643 (1996-12-01), None
patent: 0887599 (1998-12-01), None
patent: 1103770 (2001-05-01), None
patent: 1134515 (2001-09-01), None
patent: 1701112 (2006-09-01), None
patent: 2001-91074 (2001-04-01), None

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