Agc Inc.

Tatsuhiro Nogami

Masato Fukushima

Hidekazu Okamoto

Toshiyuki Tanaka

Satoshi Kawaguchi

Katsuya Ueno

Tetsuo Otsuka

Yoshinobu Kadowaki

Hirokazu Takagi

Daisuke Shirakawa

Hiroaki Mitsuoka

Mai Tasaka

Takeaki Arai

A working fluid for heat cycle, wherein the global warming potential is less than 300; the product of the relative coefficient of performance and the relative refrigerating capacity is at least 0.820 relative to R410A in a standard refrigerating cycle under conditions of an evaporation temperature of 0&#xb0; C., a condensing temperature of 40&#xb0; C., a supercoiling degree of 5&#xb0; C. and a degree of superheat of 5&#xb0; C.; the relative compressor discharge gas pressure is at most 1.100; the lower limit of the combustion range by method A in High Pressure Gas Safety Act is at least 5 vol %; and the pressure will not exceed 2.00 MPaG in a combustion test by method A in High Pressure Gas Safety act under 0.98 MPaG at 250&#xb0; C.

Working fluid for heat cycle, composition for heat cycle system, and heat cycle system

A working fluid for heat cycle contains trifluoroethylene and 2,3,3,3-tetrafluoropropene. The proportion of the total amount of trifluoroethylene and 2,3,3,3-tetrafluoropropene based on the entire amount of the working fluid is higher than 90 mass % and at most 100 mass %. The proportion of trifluoroethylene based on the total amount of trifluoroethylene and 2,3,3,3-tetrafluoropropene is at least 21 mass % and at most 39 mass %. The working fluid has a low global warming potential and suppressed self-decomposition property. A composition for a heat cycle system contains the working fluid and a heat cycle system employs the composition.

To provide a working fluid which has cycle performance sufficient as an alternative to R410A while the influence over global warming is sufficiently suppressed, which does not significantly increase the load to an apparatus as compared with a case where R410A is used, and which can be stably used continuously without any special measures, a composition for a heat cycle system contains the working fluid, and a heat cycle system employs the composition. A working fluid for heat cycle, wherein the global warming potential is less than 300; the product of the relative coefficient of performance and the relative refrigerating capacity is at least 0.820 relative to R410A in a standard refrigerating cycle under conditions of an evaporation temperature of 0&#xb0; C., a condensing temperature of 40&#xb0; C., a supercoiling degree of 5&#xb0; C. and a degree of superheat of 5&#xb0; C.; the relative compressor discharge gas pressure is at most 1.100; the lower limit of the combustion range by method A in High Pressure Gas Safety Act is at least 5 vol %; and the pressure will not exceed 2.00 MPaG in a combustion test by method A in High Pressure Gas Safety act under 0.98 MPaG at 250&#xb0; C.

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Chiyoda-ku, Japan

Tatsuhiro Nogami