| 摘要 |
PROBLEM TO BE SOLVED: To provide a refrigerant-circulating system without causing disruption of ozonosphere, capable of realizing excellent reliability and energy efficiency and useful for refrigeration and cold storage, air-conditioning and dehumidification, or the like by using a specific aromatic polyether oil as a refrigerating machine oil. SOLUTION: This refrigerant-circulating system obtained by forming a refrigerator circuit comprising a refrigerant compressor, a condenser, an expanding structure and an evaporator, and comprising a refrigeration cycle using a refrigerant without containing chlorine uses (A) an aromatic polyether oil having a benzene ring having an ether bond in a base oil structure e.g. a compound of the formula [a six-membered ring is benzene ring; R- to R2 are each H or a 1-7C alkyl with the proviso that one to three R0 's can be added to the ring; (n) is a polymerization degree and is 1-48]}. Preferably, the system has the component A or the refrigerating machine oil which is a mixed oil thereof, regulated so that a viscosity at 40 deg.C and a vaporizing temperature may be 5-50 cSt and (-45)-0 deg.C, respectively in the case of refrigeration and cold storage, and the viscosity at 40 deg.C and the vaporizing temperature may be 20-80 cSt and (-20)-(+20) deg.C, respectively in the case of air-conditioning and dehumidification. |
