Thermodynamic analysis and optimization of novel ejector-expansion TRCC (transcritical CO2) cascade refrigeration cycles (Novel transcritical CO2 cycle)

Mortaza Yari and S.M.S. Mahmoudi

Energy, 2011, vol. 36, issue 12, 6839-6850

Abstract: In this paper, two new CO2 cascade refrigeration cycles are proposed and analyzed. In both these cycles the top cycle is an ejector-expansion transcritical cycle and the bottom cycle is a sub-critical CO2 cycle. In one of these proposed cycles the waste heat from the gas cooler is utilized to drive a supercritical CO2 power cycle making the plant a combination of three cycles. Using the first and second laws of thermodynamics, theoretical analyses on the performance characteristics of the cycles are carried out. Also a parametric study is conducted to optimize the performance of each cycle under various operating conditions. The proposed cycles exhibit a reasonable value of COP (coefficient of performance) with a much less value of compressor discharge temperature, compared to the conventional cycles.

Keywords: Ejector; Transcritical cycle; Exergy; COP; Efficiency; CO2 (search for similar items in EconPapers)
Date: 2011
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Citations: View citations in EconPapers (19)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:36:y:2011:i:12:p:6839-6850

DOI: 10.1016/j.energy.2011.10.012

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