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Working Fluid Selection for Simple and Recuperative Organic Rankine Cycle Operating Under Varying Conditions: A Comparative Analysis
Dodeye Igbong 1  
,   Oku Ekpenyong Nyong 1  
,   James Enyia 1  
,   Ambrose Agba 2  
 
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1
Department of Mechanical Engineering, Faculty of Engineering, Cross River University of Technology, Calabar, Nigeria
2
Department of Mechanical Engineering, Faculty of Engineering, University of Calabar, Nigeria
CORRESPONDING AUTHOR
Dodeye Igbong   

Department of Mechanical Engineering, Faculty of Engineering, Cross River University of Technology, Calabar, Nigeria
Publication date: 2021-12-01
 
Adv. Sci. Technol. Res. J. 2021; 15(4):202–221
 
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ABSTRACT
The selection of suitable working fluid for simple and recuperative organic Rankine cycle (ORC) operating under subcritical, superheated and supercritical conditions are investigated. 11 fluids with critical temperature above 1500C are considered as potential candidates. Performance screening parameters such as net power output, thermal efficiency, turbine sizing parameter (SP) and volumetric flow ratio (VFR), exegetic parameters like irreversibility rate, fuel depletion ratio, and improvement potential rate of exergy destruction were also evaluated. Results indicate that R600a, R236fa and R1233dz(E) demonstrated the best performance for subcritical, superheated and supercritical simple ORC, respectively. R236fa and R1233dz(E) proved more suitable for subcritical/superheated and supercritical recuperative cycles, respectively. The system exegetic efficiency is reveal to be significantly higher in subcritical/superheated (61-65%) cycles compared to the supercritical (35-45%) cycle, the evaporator seen as the main source of exergy destruction, accounting for 17-37% of inlet exergy destroyed and about 8-24% in the turbine