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Research Papers: Heat Exchangers

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, Pedram Hanafizadeh

School of Mechanical Engineering,
College of Engineering,
University of Tehran (UT),
Tehran 1475857718, Iran

Sadegh Sadeghi

School of Mechanical Engineering,
Iran University of Science and
Technology (IUST),
Narmak,
Tehran 1475857718, Iran

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received November 14, 2016; final manuscript received April 25, 2017; published online May 23, 2017. Assoc. Editor: Jim A. Liburdy.

J. Heat Transfer 139(10), 101801 (May 23, 2017) (12 pages) Paper No: HT-16-1743; 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 (nondominated sorting genetic algorithm (GA)), 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.” Afterward, for the designs, cycle efficiency and net present value (NPV) 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 nondominated sorting concept leading to the optimal solutions.

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References

Figures

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Fig. 1

Definition of geometrical parameters: (a) rectangular plain fin, (b) triangular plain fin, and (c) offset strip fin [12]

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Fig. 2

(a) Definition of geometrical parameters for louver fin [16] and (b) cross section of louver fin [16]

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Fig. 3

Plate-fin heat exchanger with crossflow arrangement [12]

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Fig. 4

(a) Flowchart of recuperator thermo hydraulic design and (b) flowchart of NSGA-II

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Fig. 5

(a) Pareto-optimal front for offset strip fin with crossflow arrangement, (b) Pareto-optimal front for rectangular fin with crossflow arrangement, (c) Pareto-optimal front for triangular fin with crossflow arrangement, and (d) Pareto-optimal front for louver fin with crossflow arrangement

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Fig. 6

(a) Pareto-optimal front for offset strip fin with counterflow arrangement, (b) Pareto-optimal front for rectangular fin with counterflow arrangement, (c) Pareto-optimal front for triangular fin with counterflow arrangement, and (d) Pareto-optimal front for louver fin with counterflow arrangement

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Fig. 7

Economic comparison of optimal design points in crossflow arrangement

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Fig. 8

Technical comparison of optimal design points in crossflow arrangement

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Fig. 9

Economic comparison of optimal design points in counterflow arrangement

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Fig. 10

Technical comparison of optimal design points in counterflow arrangement

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Fig. 11

Effect of recuperator efficiency on profit and consumed costs in crossflow arrangement

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Fig. 12

Effect of recuperator efficiency on profit and consumed costs in counterflow arrangement

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Fig. 13

Final optimum designs based on nondominated sorting concept for crossflow arrangement

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Fig. 14

Final optimum designs based on nondominated sorting concept for counterflow arrangement

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