| abstract |
The present invention provides a composition for a thermal cycle system that enables HCFO and CFO to achieve more stable lubrication, and a thermal cycle system using the composition. The composition for thermal cycle system comprises a working medium for thermal cycle containing at least one compound selected from a predetermined HCFO and CFO, and a mixed refrigeration oil obtained by mixing other predetermined refrigeration oil with a naphthenic mineral oil, and a mixed refrigeration The kinematic viscosity of the oil at 40°C is 300 mm 2 /s or less, and the viscosity at 60°C of the mixed composition 1 of the working medium for heat cycle with a working medium concentration of 10 mass % and the mixed refrigerating machine oil is 10 mPa· s or more, the two-phase separation temperature of the mixed composition 2 of the working medium for a thermal cycle system and the mixed refrigerating machine oil having a concentration of 5 mass % of the mixed refrigerating machine oil is 0° C. or lower. The thermal cycling system used the above-mentioned composition for thermal cycling systems. |