Bubble pressure measurements for the (1,1,1,2-tetrafluoroethane + triethylene glycol dimethyl ether) system |
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| Institution: | 1. Dipartimento di Fisica Tecnica, Università di Padova, via Venezia 1, I-35131 Padova, Italy;2. Laboratory for Thermophysical Properties LTP GmbH, Marie-Curie-Straße 10, D-26129 Oldenburg, Germany;3. Department of Industrial Chemistry, University of Oldenburg, D-26111 Oldenburg, Germany;1. University of Maribor, Faculty of Chemistry and Chemical Engineering, Smetanova 17, SI-2000 Maribor, Slovenia;2. University of Prishtina, Faculty of Mathematics and Natural Sciences, Pristina, Kosovo, Serbia;1. Laboratory of Thermal and Energy Systems Studies, Monastir University, Ibn Eljazzar Street, 5019 Monastir, Tunisia;2. Mechanical Engineering Department, College of Engineering, Umm Al-Qura University, Makkah P.O. Box 5555, Saudi Arabia;1. JSPM’s Rajarshi Shahu College of Engineering, Pune 411027 (M.S.), India;2. School of Chemical Sciences, North Maharashtra University, Jalgaon 425001 (M.S.), India |
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| Abstract: | A computer-operated static apparatus has been used for the measurement of the bubble pressures of the (1,1,1,2-tetrafluoroethane + triethylene glycol dimethyl ether) system at temperatures between (283 and 323) K in the composition range where the first component is prevailing, i.e., mainly for a mole fraction in the liquid phase greater than 0.7. The chosen ranges cover the most interesting conditions for the technical applications of such a mixture in refrigeration plants. The obtained experimental data constitute a set of 125 points distributed along five isotherms. The data have been correlated using a Wilson model for the activity coefficient, reaching satisfactory results; in fact the average absolute value of the relative deviation of the experimental bubble pressure from the model is 0.16 · 10−2. At high temperatures, the mixtures with low content of triethylene glycol dimethyl ether show positive deviations from Raoult’s law, whereas the other cases are characterized by negative deviations. |
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