Authors: Mohammad Hossein Ahmadi; Mehdi Mehrpooya; S. Mohsen Pourkiaei; Michel Feidt; Mohammad Sameti
Addresses: Renewable Energies and Environmental Department, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran ' Renewable Energies and Environmental Department, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran ' Department of Energy, Material and Energy Research Center, Karaj, Meshkin Dasht, Imam Khomeini Boulevard, Iran ' Laboratoire d'Energétique et de Mécanique Théorique et Appliquée, ENSEM, 2, Avenue de la Forêtde Haye 60604, 54518, Vandoeuvre, France ' Renewable Energies and Environmental Department, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran
Abstract: This paper presents an investigation on irreversible refrigerator cycle based on external and internal irreversibilities considering finite heat capacities of external reservoirs. Finite temperature difference of the working fluid and external fluids causes the external irreversibility. The internal irreversibilities are caused by regenerative heat loss. Two objective functions including the coefficient of performance (COP) and has been considered simultaneously for maximisation and the normalised entropy generation rate of the refrigerator is minimised at the same time. Multi-objective evolutionary algorithms (MOEAs) based on NSGA-II algorithm has been employed while the Internal irreversibility parameter (I) and the temperatures of the fluid exchanging heat with the reservoir at the temperatures TH(Th) are considered as decision variables. Pareto optimal frontier has been performed and a final optimal solution has been chosen using various decision-making methods as well as the fuzzy Bellman-Zadeh, LINMAP and TOPSIS methods.
Keywords: refrigeration cycles; optimum performance; decision making; evolutionary algorithms; multi-objective optimisation; thermodynamics; irreversible refrigerators; NSGA-II; genetic algorithms; irreversibilities; finite heat capacity; external reservoirs; finite temperature difference; regenerative heat loss; coefficient of performance; COP; entropy generation; fuzzy Bellman-Zadeh; LINMAP; TOPSIS.
International Journal of Renewable Energy Technology, 2015 Vol.6 No.3, pp.261 - 275
Received: 31 Oct 2013
Accepted: 18 Jun 2014
Published online: 19 May 2015 *