COMPOSITION FOR HEAT CYCLE SYSTEM, AND HEAT CYCLE SYSTEM

摘要

A composition for a heat cycle system which has excellent lubrication properties and which contains a heat cycle working medium usable as a substitute for R410A and having a low global warming potential, and a heat cycle system using said composition are provided. This composition for a heat cycle system contains a heat cycle working medium that contains an unsaturated fluorinated hydrocarbon compound of a specific structure, and a refrigerator oil which has an insulation breakdown voltage of 25kV or greater, a hydroxyl value of 0.1mgKOH/g or less, a kinetic viscosity at 40°C of 5-200mm2/s and a kinetic viscosity at 100°C of 2-30mm2/s; this heat cycle system uses this composition for a heat cycle system.