Thermoeconomic optimization and comparison of plate-fin heat exchangers using louver, offset strip, triangular and rectangular fins applied in 200 kW microturbines

[+] Author and Article Information
Peyman Maghsoudi

School of Mechanical Engineering, College of Engineering, University of Tehran (UT), Tehran, Iran

Sadegh Sadeghi

School of Mechanical Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, Iran

Pedram Hanafizadeh

School of Mechanical Engineering, College of Engineering, University of Tehran (UT), Tehran, Iran

1Corresponding author.

ASME doi:10.1115/1.4036618 History: Received November 14, 2016; Revised April 25, 2017


In this paper, four types of plate-fin heat exchangers applied in 200 kW microturbines are investigated. Multi-objective optimization algorithm, NSGA-II (Non-dominated Sorting Genetic Algorithm), is employed to maximize the efficiency of the recuperator and minimize its total cost, simultaneously. Feasible ranges of pressure drop, Reynolds number and recuperator efficiency are obtained according to a penalty function. The optimizations are conducted for rectangular fin, triangular fin, louver fin and offset strip fin recuperators with cross and counter flow arrangements. The results of each optimization problem are presented as a set of designs, called ‘Pareto-optimal solutions’. Afterwards, for the designs, cycle efficiency and NPV (Net Present Value) are compared based on technical and economic criteria, respectively. Maximum cycle efficiency occurring in a recuperator with louver fin and counter flow arrangement is found to be 38.17 %. Finally, the optimum designs are compared based on non-dominated sorting concept leading to the optimal solutions.

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