Predicting the Slope of the Temperature-Entropy Vapor Saturation Curve for Working Fluid Selection Based on Lee-Kesler Modeling

Julian Osorio Ramirez, ZohRob Hovsapian, Alejandro Rivera-Alvarez, Obie Abakporo, Juan Ordonez

Research output: Contribution to journalArticlepeer-review

6 Scopus Citations

Abstract

This paper presents a general, novel, and accurate method to determine the shape of the temperature-entropy (T-S) vapor saturation curve for fluids, based on Lee-Kesler's version of the corresponding states principle. The slope of the T-S vapor saturation curve and the location of isentropic points are successfully predicted for any fluid as a function of only three input variables: Acentric factor (ω), ideal-gas ratio of specific heats at the critical temperature (kc), and the exponent of the heat capacity ratio vs temperature power relationship (m). The proposed method is then applied to a set of 120 commercially available fluids, and the results are validated with experimental data. As the method effectively distinguishes among dry, wet, and isentropic fluids, a simple semiempirical equation establishing the frontier between wet and dry fluid regions is discovered. The developed method can be used as an effective tool for working fluid selection for organic Rankine cycles (ORCs), refrigeration cycles, and heat pumps. It also has the potential to aid the development of new fluids with a proper set of characteristics for specific applications.

Original languageAmerican English
Pages (from-to)956-969
Number of pages14
JournalIndustrial and Engineering Chemistry Research
Volume59
Issue number2
DOIs
StatePublished - 15 Jan 2020

Bibliographical note

Publisher Copyright:
Copyright © 2019 American Chemical Society.

NREL Publication Number

  • NREL/JA-5500-75160

Keywords

  • corresponding states
  • Lee-Kesler modeling
  • temperature-entropy saturation curve
  • wet, dry, and isentropic fluids
  • working fluid selection.

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