Multi-objective optimal design of an Organic Rankine Cycle (ORC) plate heat exchanger with phase change

Norouzi, M, Targhi, RM, Hashemian, SM, Vaziri, SA and Beg, OA ORCID: 2021, 'Multi-objective optimal design of an Organic Rankine Cycle (ORC) plate heat exchanger with phase change' , AUT Journal of Mechanical Engineering, 5 (4) , p. 8.

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Organic Rankine Cycles (ORCs) have been shown to be feasible thermodynamically for electricity generation from organic fluids as working fluids with low temperature sources. Heat exchanger performance is strongly influenced by thermodynamic cycle efficiency. Minimizing heat losses and therefore maintenance costs is critical to attaining robust heat exchanger performance. As such heat exchanger optimization has emerged as a significant branch of thermal engineering design in the 21st century. We consider a plate heat exchanger as an evaporator and R123 as the working fluid based on ORC thermodynamics. Water vapor with entrance temperature of 150 Celsius is deployed as hot fluid. In this study, a multi-objective optimization method founded on genetic algorithms is implemented to obtain optimized geometrical parameters for the heat exchanger configuration which lead to pressure drop minimization and overall heat transfer coefficient maximization. In the optimization simulations, two objective function are conflicting with each other. Both single and two-phase flow scenarios are addressed. Therefore, in the present optimization method, a Pareto solution is used which permits the derivation of a mathematical relation between the two objective functions simultaneously and yields the optimal geometrical parameters for heat exchangers subject to constraints associated with the Pareto optimal set. A detailed sensitivity analysis has been conducted for each geometrical parameter and the effects of each parameter on key design characteristics have been evaluated.

Item Type: Article
Schools: Schools > School of Computing, Science and Engineering
Journal or Publication Title: AUT Journal of Mechanical Engineering
Publisher: Amirkabir University of Technology
ISSN: 2588-2945
Related URLs:
Depositing User: OA Beg
Date Deposited: 30 Mar 2021 13:38
Last Modified: 01 Oct 2021 09:45

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