Title: Energy and exergy analysis of a combined transcritical CO₂ compression refrigeration and single effect H₂O-LiBr vapour absorption system

Authors: Akhilesh Arora; Nikhil Kumar Singh; Saksham Monga; Omesh Kumar

Addresses: Department of Mechanical Engineering, Delhi Technological University (formerly Delhi College of Engineering), Bawana Road, Delhi 110042, India. ' Department of Mechanical Engineering, Delhi Technological University (formerly Delhi College of Engineering), Bawana Road, Delhi 110042, India. ' Department of Mechanical Engineering, Delhi Technological University (formerly Delhi College of Engineering), Bawana Road, Delhi 110042, India. ' Department of Mechanical Engineering, Delhi Technological University (formerly Delhi College of Engineering), Bawana Road, Delhi 110042, India

Abstract: A refrigeration system is conceived and analysed wherein high grade waste heat from the gas cooler of a TCRS is utilised to operate a single effect H₂O-LiBr VARS. A simulation program is developed for computation of optimum gas cooler pressure of TCRS. The COP and ? _ex for individual TCRS and VARS as well as for the combined system have been evaluated. For different values of evaporator temperature and T₄ in TCRS, the increase in refrigerating capacity for the combined system ranges from 3.52–49.80%, while the COP and ? _ex increase by 3.72–48.96% and 1.40–10.18% respectively over TCRS.

Keywords: energy analysis; exergy analysis; carbon dioxide; transcritical CO2 compression refrigeration; vapour absorption; waste heat; vapour absorption; optimum gas cooler pressure; simulation; evaporator temperature; refrigerating capacity.

DOI: 10.1504/IJEX.2011.043916

International Journal of Exergy, 2011 Vol.9 No.4, pp.453 - 471

Received: 22 Feb 2011
Accepted: 14 May 2011
Published online: 01 Dec 2011 *

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