Title: Techno-environmental analysis of a parabolic dish assisted recompression with and without reheat s-CO₂ Brayton cycle

Authors: Muhammad Abid; Muhammad Sajid Khan; Tahir A.H. Ratlamwala

Addresses: Department of Energy Systems Engineering, Faculty of Engineering, Cyprus International University, Northern Cyprus, Turkey ' Department of Mechanical Engineering, Mirpur University of Science and Technology (MUST), Mirpur, 10250 (AJK), Pakistan ' Department of Engineering Sciences, National University of Science and Technology, Karachi, Pakistan

Abstract: This comparative research concentrates on the parabolic dish system with two types of supercritical CO₂ Brayton cycles, (a recompression with reheat and without reheat) solar assisted Brayton cycles. The performance of both systems has been numerically analysed by comparing their net power output, overall energetic and exergetic efficiencies, exergo-environmental analysis and individual components exergy destruction rates by varying several input parameters. Super critical CO₂ has been circulated into the Brayton cycle loop, whereas, fresh water is used as a heat transfer fluid in solar collector. The simulations has been performed for Pakistan (Southern Punjab, latitude for the location is 29° 25/5.0448 N while longitude is 71° 40/14.4660 E), where, DNI is higher and almost equal to 1,000 W/m². The simulation results show that the overall energy and exergy efficiencies of recompression with reheat system are considerably higher (almost 11.50%) than the recompression without reheat system.

Keywords: parabolic dish system; s-CO₂; Brayton cycle; exergy; net power output; exergo-environmental.

DOI: 10.1504/IJEX.2018.096014

International Journal of Exergy, 2018 Vol.27 No.4, pp.527 - 552

Received: 22 Dec 2017
Accepted: 11 Aug 2018
Published online: 06 Nov 2018 *

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