International Research Journal of Innovations in Engineering and Technology - IRJIET International Open Access, Monthly, Peer Reviewed, Reputed Journal ISSN (online): 2581-3048

Impact Factor (2025): 6.9

DOI Prefix: 10.47001/IRJIET

Energy, Exergy, and Exergoeconomic Analysis of a Combined Recompression Supercritical Carbon Dioxide Brayton-Organic Rankine Cycle for Waste Heat Recovery

Abstract

In this study, an energy, exergy and exergoeconomic analyses of combined recompression supercritical carbon dioxide and organic Rankine cycle (SCO2/ORC) for waste heat recovery application is presented. The impact of P1, T1, m ̇co2, εLTR and εHTR on the system’s thermodynamic and exergoeconomic performance is investigated. The working fluid used for the bottoming cycle of the SCO2/ORC system is R245fa. Results obtained shows that a maximum WNet, ηth,ηex of 1088kW, 47.11%, 58.81% and minimum celect of 4.274$/GJ at different operating conditions is achievable. Also we observe that increasing the inlet pressure by 10kPa leads to the increase of about 251.3kW of net power, 1.89%pt. increase of ηth and 5.165h/GJ of Z ̇overall+C ̇D,overall, and decreases ηex and celect by 1.89%pt. and 1.618$/GJ, respectively. Similarly, increasing T1 shows an increasing influence on WNet, ηth, ηex and foverall while the reverse trend is experience for celect, C ̇D,overall and Z ̇overall + C ̇D,overall.

Country : Nigeria

1 Oku Ekpenyong Nyong

  1. Department of Mechanical Engineering, University of Cross River State, Calabar, Nigeria

IRJIET, Volume 7, Issue 7, July 2023 pp. 165-177

doi.org/10.47001/IRJIET/2023.707026

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