Vapor Pressure, Speed of Sound, and PVT-Properties of R-404a in the Vapor Phase |
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Authors: | V A Gruzdev S G Komarov S V Stankus |
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Affiliation: | (1) Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, Lavrentyev Ave., 1, Novosibirsk, 630090, Russia |
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Abstract: | The density (300–363 K, up to 3.5 MPa) and speed of sound (293–373 K, 7.5–480 kPa) in gaseous R-404a have been studied by
an isochoric piezometer method and an ultrasonic interferometer, respectively. The pressures of the saturated vapor along
the dew line were measured from 298 to 330 K. The experimental uncertainties of the temperature, pressure, density, and speed-of-sound
measurements were estimated to be within ±20 mK, ±1.5 kPa, ±0.15%, and ±(0.1–0.2)%, respectively. On the basis of the obtained
data, the isobaric molar heat capacity of R-404a was calculated for the ideal-gas state. An eight-coefficient Benedict–Webb–Rubin
equation of state has been developed for the gaseous phase of R-404a. |
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Keywords: | Density Ideal-gas heat capacity Isochoric piezometer Pressure R-404a Speed of sound Ultrasonic interferometer Vapor |
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