423 オレフィン系新規冷媒の臨界点測定(<企画>環境共生型次世代作動流体)

概要

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Critical properties (critical temperature, T_c, critical pressure, P_c, and critical density, P_c) were measured for HFO-1234yf (CF_3CF=CH_2, 2,3,3,3,-tetrafluoropropene). The measurement principle is based on the visual-observation-method of the phase boundary and critical opalescence for the sample fluid. Sample pressure is directly measured by a pressure gauge placed in a temperature-controlled-thermostat, so that T_c and P_c can be easily determined by observing appearance or disappearance of the phase boundary and behavior of the critical opalescence. Volume of the sample cell was determined by measuring CO_2 under the conditions of T_c and P_c for HFO-1234yf, and then P_c was determined. We also measured saturated vapor pressure of HFO-1234yf from 303.15 K to 367.15 K, and formulated them as the Wagner's type vapor pressure equation.
一般社団法人日本機械学会の論文
2009-07-08