Title: Exergetic performance evaluation of ejector cooling system

Authors: Syed A. Tirmizi, P. Gandhidasan, Syed M. Zubair

Addresses: Mechanical Engineering Department, King Fahd University of Petroleum & Minerals, KFUPM Box # 1474, Dhahran 31261, Saudi Arabia. ' Mechanical Engineering Department, King Fahd University of Petroleum & Minerals, KFUPM Box # 1474, Dhahran 31261, Saudi Arabia. ' Mechanical Engineering Department, King Fahd University of Petroleum & Minerals, KFUPM Box # 1474, Dhahran 31261, Saudi Arabia

Abstract: Ejector-cooling model is developed to calculate the entrainment ratio and the area ratio representing throat to nozzle area. The developed model is validated with available experimental data in the literature. Parametric studies using the refrigerant R134a as the working fluid show that the Coefficient of Performance (COP) of the system is increased by increasing the generator and evaporator temperatures while decreasing the condenser temperature. Furthermore, for the same set of operating temperatures and for various refrigerants considered, the highest COP is obtained using the refrigerant R717 and the lowest by using R114 as the working fluid. The second-law analysis shows that the major sources of irreversibility are the ejector followed by the generator.

Keywords: exergy; air conditioning; performance evaluation; ejector cooling; COP; coefficient of performance; refrigerants; modelling; generator temperature; evaporator temperature; condenser temperature; second law analysis; irreversibility.

DOI: 10.1504/IJEX.2011.041431

International Journal of Exergy, 2011 Vol.9 No.1, pp.80 - 98

Received: 10 Jun 2010
Accepted: 30 Dec 2010
Published online: 22 Jul 2011 *

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