Isochoric p-rho-T Measurements for Binary Refrigerant Mixtures Containing Difluoromethane (R32), Pentafluoroethane (R125), 1,1,1,2-Tetrafluoroethane (R134a), and 1,1,1-Trifluoroethane (R143a) from 200 to 400 K at Pressures to 35 Mpa

Published

January 1, 2000

Author(s)

Joe W. Magee, William M. Haynes

Abstract

The p-p-T relationships were measured for binary refrigerant mixtures by an isochoric method with gravimetric determinations of the amount of substance. Temperatures ranged from 200 to 400 K, while pressures extended up to 35 MPa. Measurements were conducted on compressed gas and liquid samples with the following mole fraction compositions: 0.4997 R32 + 0.5003 R134a, 03288 R32 + 0.6712 R134a, 0.4996 R32 + 0.5001 R125 + 0.4999 R134a, and 05000 R125 + 0.5000 R143a. Most published p-p-T data are in good agreement with this study. The unceratinty is 0.03 K for temperature and is 0.01% for pressure at p>3 MPa and 0.05% at p3), with a standard uncertainty of 0.003 cm³. When all components of experimental uncertainty are considered, the expanded relative uncertainty (with a coverage factor k=2 and thus, a two-standard deviation estimate) of the density measurements is estimated to be 0.05%.

Citation

International Journal of Thermophysics

Volume

21

Issue

No. 1

Pub Type

Journals

Keywords

density, difluoromethane, mixtures, p-p-T data, pentafluoroethane, R125, R134, R143a, R32

Citation

Magee, J. and Haynes, W. (2000), Isochoric p-rho-T Measurements for Binary Refrigerant Mixtures Containing Difluoromethane (R32), Pentafluoroethane (R125), 1,1,1,2-Tetrafluoroethane (R134a), and 1,1,1-Trifluoroethane (R143a) from 200 to 400 K at Pressures to 35 Mpa, International Journal of Thermophysics (Accessed October 24, 2025)