Title: Enhanced performance of a modified tc-CO₂ refrigeration system aided with an absorption chiller - an exergetic and energetic analysis

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: The present study analyses thermodynamically a novel tc-CO₂ refrigeration system designed for low-temperature refrigeration. Subcooling is achieved through a single-effect absorption chiller, using compression-generated heat. A work recovery turbine reduces throttling losses and electricity consumption. Performance enhancements are obtained via parametric analysis and optimisation. The integrated system is compared with basic tc-CO₂ configurations with a work recovery turbine. Results show a 28.83% performance enhancement over the TCRST for an evaporator temperature of -35°C and a heat rejection temperature of 35°C. This research underscores the effectiveness of the integrated system in improving refrigeration performance under various conditions.

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

DOI: 10.1504/IJEX.2024.140183

International Journal of Exergy, 2024 Vol.44 No.3/4, pp.364 - 381

Received: 14 Jul 2023
Accepted: 09 Jun 2024
Published online: 27 Jul 2024 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article