Cite as:
Grigiante M, Scalabrin G, Benedetto G, Gavioso R, Spagnolo R, 2001, "A direct reduction procedure for gas density determination of R143a from acoustic measurements" High Temperatures - High Pressures 33(4) 447 – 454
A direct reduction procedure for gas density determination of R143a from acoustic measurements
Maurizio Grigiante, Giancarlo Scalabrin, Giuliana Benedetto, Roberto Gavioso, Renato Spagnolo
Received 09 February 2000
Abstract. Measurements of the speed of sound in the vapour phase of 1,1,1-trifluoroethane (HFC-143a) are presented. The measurements were performed in a stainless-steel spherical resonator of ~900 cm3 at temperatures (T) between 270 K and 350 K and at pressures (p) up to 500 kPa. The experimental apparatus is described. Ideal-gas heat capacities and acoustic virial coefficients are directly deduced from the data. The results of these measurements are utilised to develop a virial equation of state with high accuracy, which represents the (p, r, T) surface of the vapour phase in the same temperature and pressure ranges, with density r.
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