抄録
Some of thermodynamic properties, i.e., vapor pressures and PVT properties for the new alternative refrigerant have been need as soon and correctly as possible for aiming to use them industrially. In this study a new apparatus using the solid piston variable volume method was developed for the measuring the thermodynamic properties of alternative refrigerants. The measurable ranges of this experimental apparatus are from 278 K to 333 K in temperature, and from 1.0 to 4.0 MPa in pressure. The uncertainties of this study were estimated within ± 18 mK is temperature, ±3.0 kPa in pressure, and ±0.45 % in density. The variable volume vessel was determined between 14.0〜16.0 cm^3 by measuring saturated liquid density of Rl34a.
