Title: Exergoeconomic and exergoenvironmental analysis and optimisation of the three configurations of CO₂ transcritical cogeneration cycle using genetic algorithm

Authors: Kaveh Hanifi; Kourosh Javaherdeh; Mortaza Yari

Addresses: Department of Mechanical Engineering, University of Guilan, P.O. Box 1841, Rasht, Iran ' Department of Mechanical Engineering, University of Guilan, P.O. Box 1841, Rasht, Iran ' Faculty of Mechanical Engineering, University of Tabriz, 22 Bahman Av. Tabriz, Iran

Abstract: In this paper, exergoeconomic and exergoenvironmental analysis and optimisation are performed for three configurations of cogeneration cycles, which differ in their energy sources. The energy sources are solar, biomass and combination of solar and biomass. Three systems are solar-CO₂ transcritical cogeneration system (SCTCS), biomass-CO₂ transcritical cogeneration system (BCTCS) and solar-biomass-CO₂ transcritical cogeneration system (SBCTCS). Hydrogen production rate optimal design (HPROD), refrigeration power optimal design (RPOD) and cost optimal design (COD) are considered for analysis and optimisation. As a result, cogeneration using biomass is the most economic effective system among the three alternative processes. In BCTCS, the cost of products decreased 9% when hydrogen production rate and refrigeration power are decreased from 1.817 l/s to 1.754 l/s and 6.425 kW to 6.103 kW, respectively. The results indicate that the total exergy destruction rate in the PROD case is higher than any other cases; however, the investment cost rate in the HPROD is higher than the two other cases.

Keywords: exergoeconomics; exergoenvironmental analysis; CO2 transcritical cogeneration cycles; optimisation; genetic algorithms; carbon dioxide; solar energy; solar power; biomass; hydrogen production rate; refrigeration power; cost optimal design; exergy destruction.

DOI: 10.1504/IJEX.2016.075674

International Journal of Exergy, 2016 Vol.19 No.3, pp.395 - 419

Received: 17 Nov 2014
Accepted: 02 Mar 2015
Published online: 31 Mar 2016 *

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