Title: Exergy and exergoeconimic analysis and multi-criteria optimisation of 1 MW installed CCHP system (a case study in Kashan University)

Authors: Saber Khanmohammadi; Shoaib Khanmohammadi; Hossein Khorasanizadeh; Masoud Afrand

Addresses: Faculty of Mechanical Engineering, University of Kashan, Kashan, Iran ' Department of Mechanical Engineering, Kermanshah University of Technology, Kermanshah, Iran ' Faculty of Mechanical Engineering, University of Kashan, Kashan, Iran ' Laboratory of Magnetism and Magnetic Materials, Advanced Institute of Materials Science, and Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam

Abstract: The present study deals with exergy and exergo-economic evaluation of a 1 MW combined cooling, heat and power (CCHP) system, composed of a natural gas prime mover internal combustion engine located in the main campus of the University of Kashan, Kashan, Iran. Using appropriate linking between engineering equation solver (EES) and MATLAB software, thermal and economic modelling and multi-criteria optimisation (MCO) have been performed. The optimisation results showed that the minimum total exergy destruction rate occurs for the exhaust gas extraction factor of 0.68, which causes $33.52/h total cost rate. For this case, among all of the system components the highest exergy destruction rate of 1,700 kW belongs to the engine. In addition, the results of the genetic algorithm-based multi-objective optimisation represented that the optimisation causes $2.68/h decrease in total cost rate and reduction of 4,512 kW in exergy destruction rate.

Keywords: combined cooling; heat and power; exergy analysis; thermoeconomic; multi-criteria optimisation; MCO.

DOI: 10.1504/IJEX.2020.107743

International Journal of Exergy, 2020 Vol.32 No.1, pp.45 - 61

Received: 29 Jun 2019
Accepted: 04 Nov 2019

Published online: 12 Jun 2020 *

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