Speed of sound in the gaseous refrigerant R-409A
Tóm tắt
Speed of sound in the gaseous refrigerant R-409A has been measured by ultrasonic interferometer in the temperature range from 293 to 373 K and at pressures from 0.05 to 0.58 MPa. The experimental uncertainties of the temperature, pressure, and speed of sound measurements were estimated to be within 20 mK, 4 kPa, and 0.1–0.2 %, respectively. On the basis of the obtained data, the isobaric molar heat capacity was calculated for the ideal-gas state. A comparison of the obtained results with the calculated speed of sound on the basis of REFPROP program was carried out.
Tài liệu tham khảo
V.A. Gruzdev, R.A. Khairulin, S.G. Komarov, and S.V. Stankus, Thermodynamic properties of HFC-227ea, Int. J. Thermophys., 2002, Vol. 23, No. 3, P. 809–824.
S.G. Komarov and S.V. Stankus, Experimental study of speed of sound in gaseous refrigerant R-507a, High Temperature, 2011, Vol. 49, No. 1, P. 150–154.
E.W. Lemmon, M.O. McLinden, and M.L. Huber, NIST Standard reference database 23: reference fluid thermodynamic and transport properties-REFPROP, Version 8.0, National Institute of Standards and Technology, Standard Reference Data Program. Gaithersburg, Maryland, 2002.
M.G. He, Z.G. Liu, and J.M. Yin, Measurements of speed of sound with a spherical resonator: HCFC-22, HFC-152a, HFC-143a and propane, Int. J. Thermophys., 2002, Vol. 23, No. 6, P. 1599–1615.
W. Bekermann and F. Kohler, Acoustic determination of ideal-gas heat capacity and second virial coefficients of some refrigerants between 250 and 420 K, Int. J. Thermophys., 1995, Vol. 16, No. 2, P. 455–464.
K.A. Gillis, Thermodynamic properties of seven gaseous halogenated hydrocarbons from acoustic measurements: CHClFCF3, CHF2CF3, CF3CH3, CHF2CH3, CF3CHFCHF2, CF3CH2CF3 and CHF2CF2CH2F, Int. J. Thermophys., 1997, Vol. 18, No. 1, P. 73–135.