Refrigeration system

F - Mech Eng,Light,Heat,Weapons – 25 – B

Patent

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Details

F25B 1/00 (2006.01) C09K 5/04 (2006.01) C10M 131/04 (2006.01) F25B 9/00 (2006.01) F25B 41/00 (2006.01) F25B 13/00 (2006.01)

Patent

CA 2402393

A refrigerant circuit is formed by connecting, in the order given, a compressor, a four-way selector valve, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger by a gas side pipe and a liquid side pipe. The refrigerant circuit is charged with a single refrigerant of R32 or with an R32/R125 mixed refrigerant whose R32 content is not less than 75% by weight. As a refrigeration oil, a synthetic oil is used, and such a refrigeration oil has an addition of an extreme pressure additive. When cooling rated capacity is not more than 5 kW, the liquid side pipe is formed by use of a pipe whose inside diameter is less than 4.75 mm.

L'invention concerne un réfrigérateur comportant un circuit de réfrigération (10) formé par la mise en circuit, dans l'ordre, d'un compresseur (11), d'une soupape à quatre voies (12), d'un échangeur thermique extérieur (13), d'un détendeur (14) et d'un échangeur thermique intérieur (15) par des conduits côté gaz (31) et des conduits côté liquide (32). Un réfrigérant R32 ou R32/R125 mélangés contenant 75 % en pds au moins de R32 est injecté dans le circuit de réfrigération (10). Une huile synthétique est utilisée comme huile de réfrigération et un additif extrême pression est ajouté à cette huile. Lorsque la capacité de refroidissement est inférieure ou égale à 5kW, le conduit côté liquide (32) est constitué d'un conduit ayant un diamètre intérieur inférieur ou égal à 4,75 mm.

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