| abstract |
The present invention provides a composition for a thermal cycle system and a thermal cycle system, which have little influence on the ozone layer, a small greenhouse effect coefficient, and are excellent in stability and durability. The composition is a composition for a thermal cycle system containing a working medium containing trifluoroethylene and difluoromethane and a phosphate ester, and the interaction distance (Ra) between the working medium and the phosphate ester is calculated from the value of the Hansen solubility parameter. ) below 15. |