NOVELTY - A heat transfer composition (C1) comprises 1,2,3,3,3-pentafluoropropene (R-1225ye) and refrigerant selected from carbon dioxide (R-744), fluoromethane (R-41), difluoromethane (R-32), fluoroethane (R-161), 1,1,1-trifluoroethane (R-143a), 1,1,1,2-tetrafluoroethane (R-134a), 1,1,2,2-tetrafluoroethane (R-134), dimethyl ether, heptafluoroproane (R-227ea), propane (R-290), propene (R-1270), isobutane (R-600a), n-butane (R-600), 2,3,3,3-tetrafluoropropene (R-1234yf), 1,1-difluorocyclopropane, 1,1,2-trifluorocyclopropane, 1,1,2,2-tetrafluorocyclopropane, pentafluorocyclopropane or ammonia.    USE - As a refrigerant composition in a heat transfer device containing a compressor such as refrigeration device e.g. automotive air conditioning systems, residential air conditioning systems, commercial air conditioning systems, residential refrigerator systems, residential freezer systems, commercial refrigerator systems, commercial freezer systems, chiller air conditioning systems, chiller refrigeration systems, and heat pump systems or as sprayable composition; in blowing agent, foam; for cooling/heating article, extracting a substance from biomass, cleaning article, extracting a material from an aqueous solution/particulate solid matrix and retrofitting a refrigeration device; in mechanical power generation device, which is adapted to use a Rankine cycle or its modification to generate work from heat (claimed).    ADVANTAGE - The composition is non-azeotropic, has a global warming potential (GWP) of less than or equal to150 (preferably 100), is non-flammable, provides improved capacity and coefficient of performance within 10% of the fluid it is intended to replace e.g. R-134a. The composition is suitable for use in existing designs of equipment, and is compatible with all classes of lubricant currently used with established hydrofluorocarbon refrigerants.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) foamable composition comprising at least one component capable of forming foam and (C1);    (2) sprayable composition comprising a material to be sprayed and a propellant comprising (C1);    (3) heating/cooling an article involving condensing and evaporating (C1) in the vicinity of the article to be heated/cooled;    (4) extracting a substance from biomass involving contacting the biomass with a solvent comprising (C1) and separating the substance from the solvent;    (5) cleaning an article involving contacting the article with a solvent comprising (C1);    (6) extracting a material from an aqueous solution/particulate solid matrix involving contacting the aqueous solution/particulate solid matrix with a solvent comprising (C1) and separating the substance from the solvent; and    (7) retrofitting a refrigeration device involving removing an existing heat transfer fluid, and introducing (C1).