COMPOSITION FOR HEAT CYCLE SYSTEM, AND HEAT CYCLE SYSTEM

摘要

To provide a composition for a heat cycle system having favorable lubricating properties and comprising a working fluid for heat cycle which has a low global warming potential and which can replace R410A, and a heat cycle system employing the composition. A composition for a heat cycle system comprising a working fluid for heat cycle containing an unsaturated fluorinated hydrocarbon compound having a specific structure, and a refrigerant oil having a breakdown voltage of at least 25 kV, having a hydroxy value of at most 0.1 mgKOH/g, and having a minimum temperature on the high temperature side of the phase separation temperature from the working fluid for heat cycle of at least 35°C and a maximum temperature on the low temperature side of at most -60°C, and a heat cycle system employing the composition for a heat cycle system.