Research on the rapid measurement of stability of a refrigerant having low global warming potential

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So far the evaluation of stability regarding refrigerants has been carried out by ANSI-ASHRAE method. A metal specimen and a refrigerant are set in glass made shield tube and these are maintained statically for about 5 ~ 10 days to obtain stability results by the method. Contrary to the conventional method, in this work, a refrigerant was circulating continuously onto high dispersed type metal specimen by using closed circulating system, and as a result, the relative stability of the refrigerant having low GWP (global warming potential) like R-1234yf (2,3,3,3-tetrafluoropropylene) and R-134a (1,1,1,2-tetrafluoroethane) was obtained within several hours. It was conjectured that decomposition of R-1234yf was enhanced on nickel and aluminum metal species but was suppressed on copper metal species. In addition, the formation of hydrogen fluoride was suggested during the decomposition of R-1234yf in the presence of metals like aluminum. Thus the short term measurement for the stability of refrigerants showing low GWP was successfully achieved.