Patent ID: 7296435

Claim:
A refrigerating system comprising: an evaporator for performing a cooling operation as a refrigerant is evaporated; a reciprocating compressor including: a driving unit for generating a linear reciprocal motional force, a compression unit for compressing the refrigerant upon receiving the linear reciprocal motional force of the driving unit, and a lubrication unit for supplying a lubricant to each motional portion of the driving unit and the compression unit and performing a lubricating operation; a condenser for changing the refrigerant compressed in the reciprocating compressor to a liquid refrigerant; and a capillary tube for decompressing the refrigerant discharged from the condenser and transmitting it to the evaporator, wherein the refrigerant is a hydrofluorocarbon (HFC) refrigerant, and the lubricant is an ester-based lubricant with a high moisture absorption and a saturated water amount of 1500˜2000 PPM, and wherein the refrigerant is HFC134a which has a purity of above 99.9%, a molecular formula of CF 3 CFH 2 , and a molecular weight of 102.