Abstract
The speed of sound of the gaseous mixture of R-134a and R-227ea (30.73 / 69.27 mass.%) was investigated by an ultrasonic interferometer over the temperature range of 293–373 K and at pressures from 0.12 MPa up to 1.3 MPa. The measurement errors for the temperature, pressure, and speed of sound were estimated at 20 mK, 4 kPa, and 0.1–0.3%, respectively. The approximation dependences for the speed of sound in the vapor were obtained and their errors were estimated. The obtained data were compared with the results of calculations by the REFPROP software.
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