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Thermophysics and Aeromechanics

2013 year, number 1

Speed of sound in the gaseous refrigerant R-409A

S.G. Komarov and S.V. Stankus
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Keywords: speed of sound, ideal-gas heat capacity, refrigerant R-409A, vapor, method of ultrasonic interferometer
Pages: 127-129


Speed of sound in the gaseous refrigerant R-409A has been measured by ultrasonic interferometer in the tem-perature 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.