Title: Energetic and exergetic performance of NH3-H2O-based absorption refrigeration cycle: effect of operating factor

Authors: Gorakshnath Dadabhau Takalkar; Rahul R. Bhosale; Nilesh A. Mali; Sunil S. Bhagwat

Addresses: Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai, 400019, India; Department of Chemical Engineering, College of Engineering, Qatar University, P.O. Box 2713, Doha, Qatar ' Department of Chemical Engineering, College of Engineering, Qatar University, P.O. Box 2713, Doha, Qatar ' CSIR – National Chemical Laboratory, Chemical Engineering and Process Development Division, Dr. HomiBhabha Road, Pune, India ' Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai, 400019, India

Abstract: One of the major objectives while designing the vapour absorption refrigeration system (VARS) is to acquire better performance within the accessible heat source and sink temperature limit. In this paper, attempts are made to identify the temperature limit for the optimisation of a single stage ammonia refrigeration system (AAR) by performing a thermodynamic analysis. To estimate the potential of utilisation of low-grade heat energy, operating factor (R) is considered towards optimising the energetic (COP) and exergetic COP (ECOP). The simulated COP and ECOP results are expended to predict the feasibility and optimum operating region for an AAR cycle in terms of the R and various operating temperatures such as Tgen, Tabs, Tcond, Te. The operating factor R covers a wide range of applications i.e., from deep-freezing (253.15 K) to air conditioning (283.15 K) and from water-cooling (303.15 K) to air cooling (318.15 K).

Keywords: ammonia absorption refrigeration; AAR; solar energy; exergy; operating factor; cold storage.

DOI: 10.1504/IJEX.2020.107192

International Journal of Exergy, 2020 Vol.31 No.4, pp.352 - 369

Accepted: 14 Oct 2019
Published online: 30 Apr 2020 *

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