Critical parameters of alternative refrigerants and their mixtures

Chernyak, Y.; Zhelezny, P.; Shcherbakov, B. F.

doi:10.1068/htec253

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Vapor Density2

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2003

2008

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“…The Lee-Kesler method [8] is used for this purpose. Initial data [9,10] for these calculations are given in Table 3. Relative deviations of the R-404a vapor density calculated by the Lee-Kesler equation from the experimental data (Table 1) are presented in Fig.…”

Section: Vapor Densitymentioning

confidence: 99%

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Vapor Pressure, Speed of Sound, and PVT-Properties of R-404a in the Vapor Phase

2008

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The density (300-363 K, up to 3.5 MPa) and speed of sound 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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Section: Vapor Densitymentioning

confidence: 99%

“…4. It is shown that the calculated and measured Table 3 Critical parameters [9] and normal boiling temperatures [10] of R-125, R-143a, and R-134a values practically coincide at high temperatures. The root-mean-square deviation of 1% is a good result, if we take into account that only data for pure components were used in the calculations.…”

Section: Vapor Densitymentioning

confidence: 99%