Title: The influence of ejector component efficiencies on performance of Ejector Expander Refrigeration Cycle and exergy analysis

Authors: H. Kursad Ersoy, Nagihan Bilir

Addresses: Department of Mechanical Engineering, Alaeddin Keykubad Campus 42250, Konya, Turkey. ' Department of Mechanical Engineering, Alaeddin Keykubad Campus 42250, Konya, Turkey

Abstract: In order to identify the amounts and locations of irreversibility within the components of the cycle, exergy analysis is employed. A two-phase constant area ejector flow model was used. As the ejector component efficiencies increase, coefficient of performance and exergy efficiency increase. As a result, when the efficiencies of motive nozzle and diffuser are 100%, the efficiency of ejector suction nozzle increases from 20% to 100%, whereas the improvement ratio in cooling coefficient of performance and that of exergy efficiency increase at approximately 4.3 times. It was also found that as ejector component efficiencies fall, optimum ejector area ratio increases.

Keywords: ejector components; component efficiency; expansion valve; COP; coefficient of performance; exergy analysis; flow modelling; irreversibilities.

DOI: 10.1504/IJEX.2010.033412

International Journal of Exergy, 2010 Vol.7 No.4, pp.425 - 438

Received: 23 Jan 2009
Accepted: 16 May 2009
Published online: 02 Jun 2010 *

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