Title: Enhanced exergy analysis of a waste heat powered ejector refrigeration system for different working fluids

Authors: Abid Ustaoglu; Mustafa Alptekin; Mehmet Emin Akay; Reşat Selbaş

Addresses: Department of Mechanical Engineering, Bartin University, Bartin, 74100, Turkey ' Institute of Science and Technology, Süleyman Demirel University, Isparta, 32260, Turkey ' Mechanical Engineering Department, Karabuk University, Karabuk, 78050, Turkey ' Technology Faculty, Department of Energy Systems Engineering, Süleyman Demirel University, Isparta, 32260, Turkey

Abstract: Conventional and enhanced exergy analyses of a waste heat powered ejector refrigeration system using exhausted gas from rotary kiln were carried out. Isentropic (R290, R141b and R142b), wet (R134a and R152a) and dry fluids (R600a) were considered in the cycle in terms of avoidable-unavoidable parts of the exergy destruction to decide improvement potentials of the overall system. The results indicate a significant issue; the importance of component can change regarding refrigerant. The ejector comes into view as an important component to improve the overall cycle performance for R134a while the generator shows the best improvement potential for R600a.

Keywords: enhanced exergy analysis; advanced exergy analysis; conventional exergy analysis; waste heat; rotary kiln; ejector refrigeration; isentropic fluid; wet fluids; dry fluid.

DOI: 10.1504/IJEX.2017.087698

International Journal of Exergy, 2017 Vol.24 No.2/3/4, pp.301 - 324

Received: 08 Dec 2016
Accepted: 28 Jul 2017

Published online: 21 Oct 2017 *

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