几种CFCs代用工质的PVTx实验研究

Experimental Study on the PVTx Behavior of Alternatives to CFCs

在对实验方法进行探讨的基础上,对HFC32、RFC143a、HCFC142b和二元混合物系HCFC22/HFC152a等CFCs替代工质进行了PVTx实验研究。蒸汽压和过热区PVTx实验精度为|△T|<28mK、|△P|<1.4kPa、|△v/v|<0.1％、|△x|<0.01％;采用直接观察泡点法测量纯质饱和液体密度精度为|△T|<38mK、|△ρ/ρ|<0.05％。基于界面消失位置和临界乳光现象测定了HFC32的临界密度为ρ_c=430±4Kg/m^3、临界温度T_c=351.28±0.05K,结合本文所给蒸汽压方程得出临界压力为P_c=5.801±0.008MPa。

PVTx measurements were taken for HFC143a, HFC32, HCFC142b, and HCFC22/HFC152a, the substantial alternatives'to CFCs, with the precisionof | T|< 28mK, |P|<1.4kPa, |v/ v|<0.1% and |x|<0.01% for points in superheated region, | T|<38mKand |p/ p|<0.05% for saturated liquid densities.By observing the disappearance of meniscus and the critical opalescence, the critical parameters of HFC32 are determined as pc=430+ 4kg/ m3, Tc = 351.28 + 0.05K and Pc= 5.801 + 0.008MPa.