Approximating the Temperature–Entropy Saturation Curve of ORC Working Fluids From the Ideal Gas Isobaric Heat Capacity

Juan A. White and Santiago Velasco
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Juan A. White: Departamento de Física Aplicada, Universidad de Salamanca, 37008 Salamanca, Spain
Santiago Velasco: Departamento de Física Aplicada, Universidad de Salamanca, 37008 Salamanca, Spain

Energies, 2019, vol. 12, issue 17, 1-14

Abstract: Recently, we proposed an approximate expression for the liquid–vapor saturation curves of pure fluids in a temperature–entropy diagram that requires the use of parameters related to the molar heat capacity along the vapor branch of the saturation curve. In the present work, we establish a connection between these parameters and the ideal-gas isobaric molar heat capacity. The resulting new approximation yields good results for most working fluids in Organic Rankine Cycles, improving the previous approximation for very dry fluids. The ideal-gas isobaric molar heat capacity can be obtained from most Thermophysical Properties databases for a very large number of substances for which the present approximation scheme can be applied.

Keywords: ORC working fluids; temperature–entropy saturation curve; saturation properties; wet and dry fluids; ideal-gas heat capacity (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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