Sound-velocity measurements for HFC-134a and HFC-152a with a spherical resonator |
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| Authors: | T. Hozumi T. Koga H. Sato K. Watanabe |
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| Affiliation: | (1) Department of Mechanical Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223, Japan;(2) Department of Printing Press Designing, Mihara Machinery Works, Mitsubishi Heavy Industries, 5007 Itozaki-cho xMihara, 729-03, Japan |
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| Abstract: | A spherical acoustic resonator was developed for measuring sound velocities in the gaseous phase and ideal-gas specific heats for new refrigerants. The radius of the spherical resonator, being about 5 cm, was determined by measuring sound velocities in gaseous argon at temperatures from 273 to 348 K and pressures up to 240 kPa. The measurements of 23 sound velocities in gaseous HFC-134a (1,1,1,2-tetrafluoroethane) at temperatures of 273 and 298 K and pressures from 10 to 250 kPa agree well with the measurements of Goodwin and Moldover. In addition, 92 sound velocities in gaseous HFC-152a (1,1-difluoroethane) with an accuracy of ±0.01% were measured at temperatures from 273 to 348 K and pressures up to 250 kPa. The ideal-gas specific heats as well as the second acoustic virial coefficients have been obtained for both these important alternative refrigerants. The second virial coefficients for HFC-152a derived from the present sound velocity measurements agree extremely well with the reported second virial coefficient values obtained with a Burnett apparatus.Paper dedicated to Professor Joseph Kestin. |
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| Keywords: | ideal-gas specific heat HFC-134a HFC-152a second acoustic virial coefficient second virial coefficient spherical resonator sound velocity |
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