Title: Using advanced exergy analysis to select an optimal working fluid pair in an absorption refrigeration cycle

Authors: Hamid-Reza Bahrami; Peyman Rafie

Addresses: Department of Mechanical Engineering, Qom University of Technology, Qom, Iran ' Department of Mechanical Engineering, Qom University of Technology, Qom, Iran

Abstract: This study has been done to compare LiNO₃-NH₃, LiBr-H₂O and LiCl-H₂O for using in absorption chillers using advanced exergy analysis (AEA) where LiCl-H₂O showed the highest COP and ECOP, and has in turn the lowest unavoidable exergy destruction. AEA results indicate that only 26% of the total exergy destruction in the cycle is preventable. The desorber has the highest exergy destruction with only 88% of it being unavoidable. The solution heat exchanger and the absorber could be improved as over 50% of their exergy destructions are avoidable. The research highlights how AEA provides insights into exergy destruction sources and potential improvements in absorption chiller systems.

Keywords: advanced exergy analysis; absorption chiller; second law of thermodynamics; coefficient of performance; exergy coefficient of performance; heat transfer.

DOI: 10.1504/IJEX.2024.140177

International Journal of Exergy, 2024 Vol.44 No.3/4, pp.261 - 278

Received: 18 Aug 2023
Accepted: 01 Apr 2024
Published online: 27 Jul 2024 *

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