Magee, J.
(1999),
Isochoric Heat Capacity Measurements for Binary Refrigerant Mixtures Containing Difluoromethane (R32), Pentafluoroethane (R125), 1,1,1,2-Tetrafluoroethane (R134a), and Trifluoroethane (R143a) From 200 to 345 K at Pressures ato 35 Mpa, International Journal of Thermophysics
(Accessed April 19, 2024)
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Isochoric Heat Capacity Measurements for Binary Refrigerant Mixtures Containing Difluoromethane (R32), Pentafluoroethane (R125), 1,1,1,2-Tetrafluoroethane (R134a), and Trifluoroethane (R143a) From 200 to 345 K at Pressures ato 35 Mpa
Published
Author(s)
Abstract
Molar heat capacities at constant volume Cv were measured for binary refrigerant mixtures with an adiabatic colorimeter with gravimetric determinations of the amount of substance. Temperatures ranged from 200 to 345 K, while pressures extended up to 35 Mpa. Measurements were conducted on liquid samples with equimolar compositions for the following binary systems: R32/R134a, R32/R125, R125/R134a, and R125/R143a. The uncertainty is 0.002 K for the temperature rise and is 0.2% for the change-of-volume work, which is the principal source of uncertainty. The expanded relative uncertainty (with a coverage factor k=2 and thus a two-standard deviation estimate) for Cv is estimated to be 0.7%.Citation
International Journal of Thermophysics
Volume
21
Issue
No. 1
Pub Type
Journals
Keywords
1, 1, 1, 2-tetrafluoroethane, binary mixtures, difluoromethane, heat capacity, pentafluoroethane, R125, R134a, R143a, R32
Citation
Created June 1, 1999, Updated February 17, 2017