Precise measurements of the vapor-liquid equilibria (VLE) of HFC-32/134a mixtures using a new apparatus

被引：21

作者：

Shimawaki, S

Fujii, K

Higashi, Y

机构：

[1] Natl Inst Adv Ind Sci & Technol, Natl Metrol Inst Japan, Mat Properties & Metrol Stat Div, Fluid Properties Sect, Tsukuba, Ibaraki 3058563, Japan

[2] Iwaki Meisei Univ, Dept Mech Engn, Fukushima 9708551, Japan

来源：

INTERNATIONAL JOURNAL OF THERMOPHYSICS | 2002年 / 23卷 / 03期

关键词：

circulation method; HFC-134a; HFC-32; mixture; refrigerant; vapor-liquid equilibrium;

D O I：

10.1023/A:1015407205188

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A new apparatus for precise measurements of the vapor-liquid equilibria of mixtures by the circulation method has been developed. This apparatus has two special components: a high-stability temperature control system and a helium pressurization system. The temperature in the liquid bath surrounding the sample cell is kept constant within +/-0.5 mK. The helium pressurization system increases the pressure of the sampled mixture when measuring the compositions at low temperatures by gas chromatography. With these components, the uncertainty in measuring the vapor-liquid equilibria has been reduced. Using this apparatus, the vapor-liquid equilibria of HFC-32/134a mixtures were measured in a temperature range of 263.15 to 293.15 K. These results are in good agreement with the calculated results from REFPROP (Ver. 6.01) with a relative pressure difference of about 2%.

引用

页码：801 / 808

页数：8

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