Research Papers: Heat Exchangers

The Second Law Analysis of Thermodynamics for the Plate–Fin Surface Performance in a Cross Flow Heat Exchanger

[+] Author and Article Information
Mansour Nasiri Khalaji, Isak Kotcioglu

Mechanical Engineering Department,
Engineering Faculty,
Atatürk University,
Erzurum 25240, Turkey

Sinan Caliskan

Mechanical Engineering Department,
Engineering Faculty,
Hitit University,
Corum 19030, Turkey

Ahmet Cansiz

Electrical Engineering Department,
Electrical-Electronics Faculty,
Istanbul Technical University,
Istanbul 34469, Turkey

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received March 15, 2018; final manuscript received September 12, 2018; published online October 8, 2018. Assoc. Editor: Guihua Tang.

J. Heat Transfer 141(1), 011801 (Oct 08, 2018) Paper No: HT-18-1149; doi: 10.1115/1.4041498 History: Received March 15, 2018; Revised September 12, 2018

In this paper, a particular heat exchanger is designed and analyzed by using second law of thermodynamics. The heat exchanger operates with the cross flow forced convection having cylindrical, square, and hexagonal pin fins (tubular router) placed in the rectangular duct. The pin fins are installed periodically at the top and bottom plates of the duct perpendicular to the flow direction, structured in-line, and staggered sheet layouts. The entropy generation in the flow domain of the channels is calculated to demonstrate the rate of irreversibilities. To obtain the efficiencies, irreversibility, thermal performance factor, and entropy generation number (EGN), the heat exchanger is operated at different temperatures and flow rates by using hot and cold fluids. Optimization of the design parameters and winglet geometry associated with the performance are determined by entropy generation minimization. The variation of the EGN with Reynolds number for various tubular routers is presented. The Reynolds number is determined according to the experimental plan and the performance is analyzed with the method of effectiveness—number of transfer unit (NTU). Based on particular designs, it was determined that the increment in fluid velocity enhances the heat transfer rate, which in turn decreases the heat transfer irreversibility.

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Grahic Jump Location
Fig. 1

(a) Schematic diagram of the test section of the cross flow heat exchanger, (b) in-line, and (c) staggered sheet layout of the upper and lower plates in the heat exchanger

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Fig. 2

Various tubular routers (heat receivers): (a) cylindrical winglet, (b) square without winglet, (c) cylindrical without winglet, (d) hexagonal winglet, (e) square winglet, and (f)hexagonal without winglet

Grahic Jump Location
Fig. 3

Variation of minimum EGN as a function of dimensionless heat transfer area: (a) winglet in-line, (b) winglet staggered, (c) without winglet in-line, and (d) without winglet staggered

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Fig. 4

Variation of optimum dimensionless mass velocity as a function of dimensionless heat transfer area: (a) winglet in-line, (b) winglet staggered, (c) without winglet in-line, and (d) without winglet staggered

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Fig. 5

Variation of optimum flow path length as a function of dimensionless mass velocity: (a) winglet in-line, (b) winglet staggered, (c) without winglet in-line, and (d) without winglet staggered

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Fig. 6

Variation of minimum EGN as a function of optimum flow path: (a) winglet in-line, (b) winglet staggered, (c) without winglet in-line, and (d) without winglet staggered

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Fig. 7

Variation of minimum EGN as a function of optimum dimensionless mass velocity: (a) winglet in-line, (b) winglet staggered, (c) without winglet in-line, and (d) without winglet staggered

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Fig. 8

Entropy generation number (vertical axis) as a function of Re number (horizontal axis) for different fin array

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Fig. 9

ε-NTU variation in tubular routers for the case of staggered sheet layout (logarithmic fit)



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