Title: Energy and exergy analysis of a novel ejector-absorption combined refrigeration cycle using natural refrigerants

Authors: Abhishek Verma; S.C. Kaushik; S.K. Tyagi

Addresses: Department of Energy Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India ' Department of Energy Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India ' Department of Energy Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India

Abstract: This article presents the theoretical analysis of a unique ejector-absorption combined refrigeration system for producing low-temperature refrigeration at -25°C and additional cooling at a temperature of 7°C by utilising the waste heat. The additional cooling is achieved by combining a trans-critical CO₂ ejector refrigeration cycle with an absorption system using LiBr-H₂O as the working fluid pair and is powered by waste heat from the gas cooler of the ejector cycle. The energy and exergy analyses have been carried out for a typical set of operating conditions to maximise the performance of the combined system. The performance of the combined system was compared to that of the basic trans-critical CO₂ ejector refrigeration cycle. The study shows a significant improvement in the performance of the system, the increment in COP and exergy efficiency was found to be 16.36% and 4.134%, respectively.

Keywords: transcritical CO₂; ejector; waste heat; absorption refrigeration; exergy.

DOI: 10.1504/IJEX.2022.125521

International Journal of Exergy, 2022 Vol.39 No.2, pp.142 - 159

Received: 28 Oct 2021
Accepted: 31 Dec 2021
Published online: 13 Sep 2022 *

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