Title: Thermoeconomic assessment of a waste heat recovery system driven by a marine diesel engine for power and freshwater production

Authors: Yadaleh Aghdoudchaboki; Ahmad Khoshgard; Gholam Reza Salehi; Farivar Fazelpour

Addresses: Department of Mechanical Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran ' Department of Energy Systems Engineering, Faculty of Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran ' Department of Mechanical Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran ' Department of Mechanical Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran

Abstract: To develop eco-friendly ships, an integrated system with power and fresh water production capabilities is introduced so as to recover waste heat of a marine engine. A thermoeconomic analysis is conducted on the system which consists a marine engine, a multi-effect desalination unit and an organic Rankine cycle. The modelling results for the base case showed that the suggested cycle is capable of 387.95 kW power and 7.04 m3/hr fresh water. In addition, the effects of major design parameters on the system performance is assessed and illustrated. The ORC contributed to the total exergy destruction by 67% while that was 33% for MED unit. Moreover, a two-objective optimisation with total cost rate and exergy efficiency as objective functions is performed to obtain the optimum values of five design parameters. An optimal condition with the exergy efficiency of 35.96% and total cost rate of 2.54 $/hr is introduced as the best trade-off solution.

Keywords: thermoeconomic; waste heat recovery; WHR; marine engine; organic Rankine cycle; ORC; multi-effect desalination; MED.

DOI: 10.1504/IJEX.2020.110841

International Journal of Exergy, 2020 Vol.33 No.3, pp.231 - 253

Received: 24 May 2019
Accepted: 18 Oct 2019

Published online: 12 Oct 2020 *

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