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

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 (..omega..), 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.

Authors:
 [1];  [2];  [3]; ORCiD logo [4];  [4]
  1. Ingeniería Termica Ltda., Medellín ( Colombia); Fundacion Ergon, Medellín (Colombia)
  2. Florida A & M University, Tallahassee, FL (United States)
  3. Florida State Univ., Tallahassee, FL (United States)
  4. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1592085
Report Number(s):
NREL/JA-5500-75160
Journal ID: ISSN 0888-5885; MainId:14990;UUID:429fc48e-97eb-e911-9c29-ac162d87dfe5;MainAdminID:3468
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
Industrial and Engineering Chemistry Research
Additional Journal Information:
Journal Volume: 59; Journal Issue: 2; Journal ID: ISSN 0888-5885
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; temperature-entropy saturation curve; corresponding states; Lee-Kesler modeling; wet, dry, and isentropic fluids; working fluid selection.

Citation Formats

Rivera-Alvarez, Alejandro, Abakporo, Obie I., Ordonez, Juan C, Osorio Ramirez, Julian, and Hovsapian, Rob. Predicting the Slope of the Temperature–Entropy Vapor Saturation Curve for Working Fluid Selection Based on Lee–Kesler Modeling. United States: N. p., 2019. Web. https://doi.org/10.1021/acs.iecr.9b05736.
Rivera-Alvarez, Alejandro, Abakporo, Obie I., Ordonez, Juan C, Osorio Ramirez, Julian, & Hovsapian, Rob. Predicting the Slope of the Temperature–Entropy Vapor Saturation Curve for Working Fluid Selection Based on Lee–Kesler Modeling. United States. https://doi.org/10.1021/acs.iecr.9b05736
Rivera-Alvarez, Alejandro, Abakporo, Obie I., Ordonez, Juan C, Osorio Ramirez, Julian, and Hovsapian, Rob. Wed . "Predicting the Slope of the Temperature–Entropy Vapor Saturation Curve for Working Fluid Selection Based on Lee–Kesler Modeling". United States. https://doi.org/10.1021/acs.iecr.9b05736. https://www.osti.gov/servlets/purl/1592085.
@article{osti_1592085,
title = {Predicting the Slope of the Temperature–Entropy Vapor Saturation Curve for Working Fluid Selection Based on Lee–Kesler Modeling},
author = {Rivera-Alvarez, Alejandro and Abakporo, Obie I. and Ordonez, Juan C and Osorio Ramirez, Julian and Hovsapian, Rob},
abstractNote = {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 (..omega..), 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.},
doi = {10.1021/acs.iecr.9b05736},
journal = {Industrial and Engineering Chemistry Research},
number = 2,
volume = 59,
place = {United States},
year = {2019},
month = {12}
}

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