| 摘要 |
PROBLEM TO BE SOLVED: To enable realization of a novel refrigeration cycle by changing at least one of a refrigerant or refrigeration machine oil of a conventional refrigeration cycle. SOLUTION: In a refrigeration cycle constituted of at least a compressor 40, a condenser 41, an expansion system 42 and an evaporator 43, at least part of a refrigerant of the refrigeration cycle using as the refrigerant a fluorocarbon containing chlorine is replaced with a fluorocarbon not containing chlorine. Preferably, a refrigeration machine oil having a critical temperature of at least 40 deg.C and viscosities of 2-70 cSt at 40 deg.C and 1-9 cSt at 100 deg.C and comprising ester oil of a fatty acid, as a base oil, having at least two ester bonds (-O-CO-) in a molecule is used as the refrigeration machine oil. |
