PVT property measurements for difluoromethane

Journal Article · Sat Oct 01 04:00:00 EDT 1994 · Journal of Chemical and Engineering Data; (United States)

DOI:https://doi.org/10.1021/je00016a048· OSTI ID:6993033

Sato, Takahiro; Sato, Haruki; Watanabe, Koichi ^[1]

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1. Keio Univ., Yokohama (Japan). Dept. of Mechanical Engineering

Experimental vapor pressure and PVT data of an important alternative refrigerant, difluoromethane (HFC-32), have been measured by means of a constant-volume method coupled with expansion procedures. Sixty-nine PVT data were measured along 10 isochores in a range of temperatures from 322 to 420 K, at pressures from 3.3 to 9.8 MPa, and at densities from 111 to 850 kg[sup 3]. Twenty-one vapor pressures were also measured at temperatures form 320 K to the critical temperature. The uncertainties of the temperature and pressure measurements are within [+-]7 mK and [+-]2 kPa, respectively, while the uncertainty of the density values is within [+-]0.1%. The purity of the sample used is 99.998 mass%. On the basis of the measurements along each isochore, six saturation densities were determined and the critical pressure was determine by correlating the vapor-pressure measurements. The second and third virial coefficients for temperatures form 340 to 420 K have also been determined.

• OSTI ID: 6993033
• Journal Information: Journal of Chemical and Engineering Data; (United States), Journal Name: Journal of Chemical and Engineering Data; (United States) Journal Issue: 4 Vol. 39:4; ISSN 0021-9568; ISSN JCEAAX
• Country of Publication: United States
• Language: English

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