Thermodynamic Modeling of Heat Engines Including Heat Transfer and Compression-Expansion Irreversibilities

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

Research output: Contribution to journalArticlepeer-review

4 Scopus Citations


In this work, a thermodynamic model based on an endoreversible engine approach is developed to analyze the performance of heat engines operating under different thermodynamic cycles. The model considers finite heat transfer rate, variable heat source and sink temperatures, and irreversibilities associated with the expansion and compression. Expressions for the maximum power and efficiency at maximum power output are obtained as a function of hot and cold reservoir temperatures, the equivalent isentropic efficiency of compression and expansion components, and the effective conductance ratio between heat exchangers. In all cases, the Curzon-Ahlborn efficiency is retrieved at constant reservoir temperatures and neglected compression-expansion irreversibilities. The proposed model allows assessing the effect of isentropic efficiencies and heat exchanger design and operation characteristics for different thermodynamic cycles.

Original languageAmerican English
Article numberArticle No. 011001
Number of pages10
JournalJournal of Thermal Science and Engineering Applications
Issue number1
StatePublished - 1 Jan 2022

Bibliographical note

Publisher Copyright:
© 2021 Georg Thieme Verlag. All rights reserved.

NREL Publication Number

  • NREL/JA-5700-78998


  • compression-expansion irreversibilities
  • efficiency at maximum power
  • heat engine
  • maximum power


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