| abstract |
(57) [Problem] To use a hydrofluorocarbon-based refrigerant which can be used in place of chlorofluorocarbon, which is a problem due to environmental pollution, has good compatibility with the refrigerant and has excellent lubricating performance. To provide a refrigerating device using oil. The refrigeration cycle includes at least a compressor, a condenser, an expansion mechanism, and an evaporator, and includes a hydrofluorocarbon, a fluorocarbon, a hydrocarbon, an ether, a carbon dioxide, or an ammonia, preferably a hydrocycle. A kinematic viscosity at a temperature of 40 ° C. containing a fluorocarbon-based refrigerant and a polyvinyl ether-based compound as main components is 2 to 200 mm 2. Refrigeration apparatus having a lubricating oil of 1 / sec. |