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Effect of various operating conditions on the cooling performance of transcritical organic rankine refrigeration system

Author: 
Ankit Tiwari, Mohan Gautam, Kuldeep Chauhan, Gopal Fartyal, Sunny Singh and Vivek Kumar Chahar
Subject Area: 
Physical Sciences and Engineering
Abstract: 

Organic Rankine vapour compression (ORVC) refrigeration systems using waste heat are well known in the literature. In last year’s, transcritical organic Rankine vapour compression (TORVC) systems are proposed to increase the system coefficient of performance (COP). This paper presents the parametric simulation results and the performance analysis of TORVC refrigeration system utilizing waste heat using R134a as working fluid under different operating conditions such as evaporation/condensation temperature and degree of superheating/sub-cooling. Heat-to-electrical energy conversion efficiency is also taken into account. System COP is defined using not only the heating energy required for the refrigerant but also electrical energy input to the pump. As waste heat one can consider also exhaust heat of the vehicles. Variation of system COP for different evaporation/condensation temperatures and the degree of superheating/sub-cooling are demonstrated. In the calculation refrigerant temperature and pressure at the heat source are taken as 180oC and 8 MPa.

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