| abstract |
A composition for use in a heat cycle system which contains a heat cycle working medium which can be used as a substitute for HFC-134a and HFC-245fa, has a low global warming coefficient and is highly stable, and a heat cycle system using said composition are provided. This composition for use in a heat cycle system contains a heat cycle working medium containing 1-chloro-2,3,3,3-tetrafluoropropene, and contains a stabilizer for suppressing deterioration of said heat cycle working medium, such as an oxidation resistance improving agent, a heat resistance improving agent, or a metal deactivator; this heat cycle system uses said heat cycle system composition. |