TY - JOUR
T1 - Precise Measurements of the Vapor-Liquid Equilibria (VLE) of HFC-32/134a Mixtures Using a New Apparatus
AU - Shimawaki, S.
AU - Fujii, K.
AU - Higashi, Y.
N1 - Funding Information:
This study was carried out with the support of the NEDO (New Energy and Industrial Technology Development Organization) in Japan. We are grateful to Dr. Masato Fukushima of the Chemicals General Division of Asahi Glass Co. Ltd. for supplying us with the samples.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2002/5
Y1 - 2002/5
N2 - 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. 6.0.1) with a relative pressure difference of about 2%.
AB - 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. 6.0.1) with a relative pressure difference of about 2%.
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U2 - 10.1023/A:1015407205188
DO - 10.1023/A:1015407205188
M3 - Article
AN - SCOPUS:0345820786
SN - 0195-928X
VL - 23
SP - 801
EP - 808
JO - International Journal of Thermophysics
JF - International Journal of Thermophysics
IS - 3
ER -