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Ideal GasHeat Capacity Derived from Speed of SoundMeasurements in the Gaseous Phase for trans-1,3,3,3-Tetrafluoropropene.

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Title: Ideal GasHeat Capacity Derived from Speed of SoundMeasurements in the Gaseous Phase for trans-1,3,3,3-Tetrafluoropropene.
Authors: Kano, Yuya1, Kayukawa, Yohei1, Fujii, Kenichi1, Sato, Haruki1
Source: Journal of Chemical & Engineering Data. Nov2013, Vol. 58 Issue 11, p2966-2969. 4p.
Subjects: Heat capacity, Speed of sound, Phase transitions, Propene, Global warming, Temperature effect, Air conditioning
Abstract: trans-1,3,3,3-Tetrafluoropropene(HFO-1234ze(E))is considered as an alternative refrigerant in automobile air conditioningapplications because of its low global warming potential. For thepurpose of evaluation of thermophysical properties of HFO-1234ze(E),the speed of sound was measured in the dilute gas region in orderto derive heat capacities in the ideal gas state. The speed of soundwas obtained from measurements of acoustic resonance frequencies ofradial modes in a spherical resonator filled with sample gas. Takingsome perturbation effects into account, the speed of sound was determinedwith a relative uncertainty of 0.01 %. The speed of sound data werefitted to the acoustic virial equation. By extrapolating the speedof sound data on each isotherm to zero pressure, the ideal gas heatcapacities at constant pressure were determined with a relative uncertaintyof 0.1 %. The isobaric ideal gas heat capacities were representedby a third-order polynomial function in temperature. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:trans-1,3,3,3-Tetrafluoropropene(HFO-1234ze(E))is considered as an alternative refrigerant in automobile air conditioningapplications because of its low global warming potential. For thepurpose of evaluation of thermophysical properties of HFO-1234ze(E),the speed of sound was measured in the dilute gas region in orderto derive heat capacities in the ideal gas state. The speed of soundwas obtained from measurements of acoustic resonance frequencies ofradial modes in a spherical resonator filled with sample gas. Takingsome perturbation effects into account, the speed of sound was determinedwith a relative uncertainty of 0.01 %. The speed of sound data werefitted to the acoustic virial equation. By extrapolating the speedof sound data on each isotherm to zero pressure, the ideal gas heatcapacities at constant pressure were determined with a relative uncertaintyof 0.1 %. The isobaric ideal gas heat capacities were representedby a third-order polynomial function in temperature. [ABSTRACT FROM AUTHOR]
ISSN:00219568
DOI:10.1021/je4004564