Working medium for heat cycle, method for storing working medium for heat cycle, method for manufacturing working medium for heat cycle,composition for heat cycle system, and storage container for working medium for heat cycle

A method of storing a working medium for a heat cycle, wherein

• the method comprises storing a working medium for a heat cycle, the working medium comprising trifluoroethylene, a low boiling point compound having a lower boiling point than a boiling point of the trifluoroethylene, and high boiling point compounds having higher boiling points than the boiling point of the trifluoroethylene,
• the low boiling point compound is at least one selected from a group consisting of carbon dioxide, hexafluoroethane, and fluoromethane, and
• the high boiling point compounds are at least two selected from a group consisting of difluoromethane, 2,3,3,3-tetrafluoropropene, (E)-1,3,3,3-tetrafluoropropene, 3,3,3-trifluoropropene, tetrafluoromethane, 1,1,2,2-tetrafluoroethane, 1,1,1-trifluoroethane, 1,1,1,2,3,3,3-heptafluoropropane, cyclopropane, isobutene, isobutane, dimethyl ether, and ammonia.

A method of producing a working medium for a heat cycle, wherein

• the method comprises mixing trifluoroethylene, a low boiling point compound having a lower boiling point than a boiling point of the trifluoroethylene, and high boiling point compounds having higher boiling points than the boiling point of the trifluoroethylene,
• the low boiling point compound is at least one selected from a group consisting of carbon dioxide, hexafluoroethane, and fluoromethane, and
• the high boiling point compounds are at least two selected from a group consisting of difluoromethane, 2,3,3,3-tetrafluoropropene, (E)-1,3,3,3-tetrafluoropropene, 3,3,3-trifluoropropene, tetrafluoromethane, 1,1,2,2-tetrafluoroethane, 1,1,1-trifluoroethane, 1,1,1,2,3,3,3-heptafluoropropane, cyclopropane, isobutene, isobutane, dimethyl ether, and ammonia.

A storage container for a working medium for a heat cycle, wherein

• the storage container is an airtight storage container in which a working medium for a heat cycle, comprising trifluoroethylene, a low boiling point compound having a lower boiling point than a boiling point of the trifluoroethylene, and high boiling point compounds having higher boiling points than the boiling point of the trifluoroethylene, is stored in a state in which a gas phase and a liquid phase coexist,
• the low boiling point compound is at least one selected from a group consisting of carbon dioxide, hexafluoroethane, and fluoromethane, and
• the high boiling point compounds are at least two selected from a group consisting of difluoromethane, 2,3,3,3-tetrafluoropropene, (E)-1,3,3,3-tetrafluoropropene, 3,3,3-trifluoropropene, tetrafluoromethane, 1,1,2,2-tetrafluoroethane, 1,1,1-trifluoroethane, 1,1,1,2,3,3,3-heptafluoropropane, cyclopropane, isobutene, isobutane, dimethyl ether, and ammonia.