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Research Papers

Simulation of Flow and Heat Transfer in Triangular Cross-Sectional Solar-Assisted Air Heater

[+] Author and Article Information
Rajneesh Kumar

Mechanical Engineering Department,
National Institute of Technology,
Hamirpur 177005, HP, India
e-mails: rajneesh127.nith@gmail.com;
rajneesh127@nith.ac.in

Anoop Kumar

Professor
Mechanical Engineering Department,
National Institute of Technology,
Hamirpur 177005, HP, India
e-mail: anoop@nith.ac.in

Varun Goel

Mechanical Engineering Department,
National Institute of Technology,
Hamirpur 177005, HP, India
e-mail: varun7go@gmail.com

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received January 3, 2018; final manuscript received July 16, 2018; published online September 14, 2018. Assoc. Editor: Ming Qu.

J. Sol. Energy Eng 141(1), 011007 (Sep 14, 2018) (12 pages) Paper No: SOL-18-1006; doi: 10.1115/1.4041098 History: Received January 03, 2018; Revised July 16, 2018

The ribbed three-dimensional solar air heater (SAH) model is numerically investigated to estimate flow and heat transfer through it. The numerical analysis is based on finite volume approach, and the set of flow governing equations has been solved to determine the heat transfer and flow field through the SAH. For detailed analysis, rib chamfer height ratio (e′/e) and rib aspect ratio (e/w), two innovative parameters, have been created and considered along with the commonly used roughness parameter, i.e., relative roughness height, e/D. The parameters e′/e, e/w, and e/D are varied from 0.0 to 1, 0.1 to 1.5, and 0.18 to 0.043, respectively, but the value of P/e is kept constant for the entire investigation at 12. A good match is seen in Nusselt number (Nu) and friction factor (f) by comparing the predicted results with the experimental ones. With the variation of roughness parameters, distinguishable change in Nu and f is obtained. The highest value of thermohydraulic performance parameter (TPP) observed is 2.08 for P/e, e′/e, e/w, and e/D values of 12, 0.75, 1.5, and 0.043, respectively, at Re of 17,100. The developed generalized equation for Nu and f has shown acceptable percentage deviation under the studied range of parameters.

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Figures

Grahic Jump Location
Fig. 2

Pictorial view of backward facing chamfered rib element

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Fig. 1

Pictorial view of SAH

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Fig. 3

Meshed domain of the SAH

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Fig. 7

Effect of e′/e on Nuenh

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Fig. 5

Influence of e′/e on Nu

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Fig. 6

Streamline pattern in different e′/e values: (a) e′/e = 0,0, (b) e′/e = 0.25, (c) e′/e = 0.50, (d) e′/e = 0.75, and (e) e′/e = 1.0

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Fig. 4

Comparison of results with experimental results by Luo et al. [47]

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Fig. 17

Effect of e/D values on fpenalty

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Fig. 8

Effect of different values of e/w on Nu

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Fig. 9

Effect of different values of e/w on Nuenh

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Fig. 10

Effect of e/D on Nu

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Fig. 11

Effect of different values of e/D on Nuenh

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Fig. 12

Effect of e′/e on f

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Fig. 13

Effect of e′/e on fpenalty

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Fig. 14

Effect of different values of e/w on f

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Fig. 15

Effect of different values of e/w on fpenalty

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Fig. 16

Effect of different values of e/D on f

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Fig. 18

Comparison of TPP observed at different Re values in different combinations of roughness parameters

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Fig. 19

Comparison of Nu(correlation) with Nu(CFD)

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Fig. 20

Comparison of f(correlation) with f(CFD)

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