Title: Thermodynamic analysis of two-stage transcritical CO₂ cycle using flash gas by-pass

Authors: Arif Emre Özgür; Cemal Tosun

Addresses: Technology Faculty, Süleyman Demirel University, Isparta 32260, Turkey ' Erciş Vocational School, 100. Yıl University, 65400 Erciş, Van, Turkey

Abstract: In this study, the thermodynamic analysis of a two-stage transcritical CO₂ cycle using flash gas by-pass is presented. The gas cooler pressure, the inter-stage pressure and the evaporation temperature of CO₂ are selected as variable parameters. The cooling performance and exergetic efficiency variations of the cycle are graphically presented with these parameters. A comparison is presented between the flash gas by-pass two-stage transcritical cycle and the conventional two-stage transcritical cycle and the optimum operating parameters of the cycles are discussed. The importance of flash gas by-pass application is presented for energy and exergy efficiency improvement of two-stage transcritical CO₂ cycles.

Keywords: CO2; carbon dioxide; refrigeration cycle; thermodynamic analysis; transcritical cycle; two-stage cycle; flash-gas by-pass; gas cooler pressure; inter-stage pressure; evaporation temperature; cooling performance; exergy efficiency; energy efficiency.

DOI: 10.1504/IJEX.2015.068215

International Journal of Exergy, 2015 Vol.16 No.2, pp.127 - 138

Received: 11 Oct 2013
Accepted: 06 Feb 2014
Published online: 24 Mar 2015 *

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