泡露点直接观察法及其在R22/R142b混合工质中的应用

A DIRECTLY OBSERVED METHOD OF THE DEW AND BOILING POINT AND ITS APPLICATION TO THE MIXTURER22/R142b

一、前言 R22/R142b作为CFC_s的替代工质和有节能潜力的工质而受到重视,但已发表的PVI_x试验数据尚少。为了补充在低温区R22/R142b的实验数据,拓宽原有PVT_x试验台的应用范围,本文采用了透明试料容器和高精度恒温槽,用直接观察法测得了温度在282.61K～302.38K范围内,摩尔成分为0.6/0.4的R22/R142b四组不同比容的泡、露点及其附近的PVT_x数据。

The dew and boiling point of R22/R142b are directly observed by use of a constant volume method apparatus with a transparent sample cell inside a thermostated bath, and the fluctuation of the temperature measuring ≤± 1mK/24h. 36 PVTx data along 4 isochores in the range of temperature from 282.61 K to 302.38 K were measured.