制冷剂R22临界参数及其汽液共存曲线的测定

THE MEASUREMENTS OF THE CRITICAL PARAMETERS AND THE VAPOR-LIQUID COEXISTENCE CURVE FOR R22

用观察法测定了R22临界区内38点实验数据,并确定其临界参数为:T_c=369.33±0.01K,ρ_c=521±10kg/m^3和p_c=4.990±0.0072MPa,最后还分析讨论了R22的汽液共存曲线。 一、实验原理和设备 临界参数用下列方法确定。1.用直接观察汽液相界面消失和临界乳光现象来确定临界温度T_c和临界密度ρ_c。实验证明,对于汽液平衡系统可以通过调节温度使汽液相界面出现或消失。当流体试样密度ρ<ρ_c时,随着温度上升汽液相界面向下移动。

38 data in the critical region for R22 have been measured by the visual observation with the critical parameters determined as: Tc = 369.33±0.01 K, ρc = 521±10kg/m2 and Pc =4.990±0.0072 MPa. The vapor-liquid coexistence curve are also reported.