Composition for heat cycle system, and heat cycle system

Abstract

To provide a composition for a heat cycle system, which comprises a working fluid for heat cycle which has a low global warming potential and high stability, and which can replace R410A, and a heat cycle system employing the composition. A composition for a heat cycle system, which comprises a working fluid for heat cycle containing trifluoroethylene, and a stabilizer for preventing deterioration of the working fluid for heat cycle, such as an oxidation resistance-improving agent, a heat resistance-improving agent or a metal deactivator, and a heat cycle system employing the composition for a heat cycle system.

1 . A composition for a heat cycle system, comprising:
 a working fluid for heat cycle comprising trifluoroethylene and a hydrofluoroolefin other than trifluoroethylene; and   a stabilizer for preventing deterioration of the working fluid for heat cycle.   
     
     
         2 . The composition for a heat cycle system according to  claim 1 , wherein the stabilizer is at least one stabilizer selected from an oxidation resistance-improving agent, a heat resistance-improving agent and a metal deactivator. 
     
     
         3 . The composition for a heat cycle system according to  claim 2 , wherein the stabilizer is at least one compound selected from the group consisting of a phenol compound, an unsaturated hydrocarbon group-containing aromatic compound, an aromatic amine compound, an aromatic thiazine compound, a terpene compound, a quinone compound, a nitro compound, an epoxy compound, a lactone compound, an orthoester compound, a mono- or di-alkali metal salt compound of phthalic acid, and a thiodiphenyl ether hydroxide compound. 
     
     
         4 . The composition for a heat cycle system according to  claim 1 , wherein a content of the stabilizer in the composition is at least 1 mass ppm. 
     
     
         5 . The composition for a heat cycle system according to  claim 1 , further comprising a refrigerant oil. 
     
     
         6 . The composition for a heat cycle system according to  claim 5 , wherein the refrigerant oil is at least one member selected from an ester refrigerant oil, an ether refrigerant oil, a polyglycol oil and a hydrocarbon refrigerant oil. 
     
     
         7 . The composition for a heat cycle system according to  claim 1 , wherein the working fluid for heat cycle further comprises at least one member selected from a saturated hydrofluorocarbon. 
     
     
         8 . The composition for a heat cycle system according to  claim 7 , wherein the saturated hydrofluorocarbon is at least one member selected from difluoromethane, 1,1-difluoroethane, 1,1,1,2-tetrafluoroethane and pentafluoroethane. 
     
     
         9 . (canceled) 
     
     
         10 . The composition for a heat cycle system according to  claim 1 , wherein the hydrofluoroolefin other than trifluoroethylene is at least one member selected from 1,3,3,3-tetrafluoropropene and 2,3,3,3-tetrafluoropropene. 
     
     
         11 . The composition for a heat cycle system according to  claim 1 , wherein a proportion of trifluoroethylene is at least 10 mass % based on the working fluid for heat cycle. 
     
     
         12 . The composition for a heat cycle system according to  claim 11 , wherein the proportion of trifluoroethylene is from 20 to 80 mass % based on the working fluid for heat cycle. 
     
     
         13 . The composition for a heat cycle system according to  claim 11 , wherein the working fluid for heat cycle further comprises difluoromethane, and a proportion of difluoromethane is at least 20 mass % based on the working fluid for heat cycle. 
     
     
         14 . A heat cycle system, which employs the composition for a heat cycle system as defined in  claim 1 . 
     
     
         15 . The heat cycle system according to  claim 14 , which is a refrigerating apparatus, an air-conditioning apparatus, a power generation system, a heat transport apparatus or a secondary cooling machine. 
     
     
         16 . The composition for a heat cycle system according to  claim 1 , wherein the working fluid for heat cycle further comprises difluoromethane, and a proportion of difluoromethane is from 35 to 80 mass % based on the working fluid for heat cycle. 
     
     
         17 . The composition for a heat cycle system according to  claim 1 , wherein the working fluid for heat cycle further comprises at least one hydrofluorocarbon selected from the group consisting of difluoromethane, 1,1-difluoroethane, and 1,1,1,2-tetrafluoroethane, and a proportion of the at least one hydrofluorocarbon is 50 mass % or more based on the working fluid for heat cycle.