Research Papers: Heat and Mass Transfer

Influence of Corrugated Booster Reflectors in a Centrally Finned Twist Inserted Solar Thermal Collector on Heat Transfer and Thermal Performance Characteristics

[+] Author and Article Information
M. Murugan

Department of Mechanical Engineering,
Vivekanandha College of
Technology for Women,
Tiruchengode, Tamilnadu 637 205, India
e-mail: murukar@gmail.com

R. Vijayan

Department of Mechanical Engineering,
Government College of Engineering,
Salem, Tamilnadu 636 011, India
e-mail: vrajnan@yahoo.co.in

A. Saravanan

Department of Mechanical Engineering,
Aditya Engineering College,
East Godavari,
Surampalem, Andhra Pradesh 533 437, India
e-mail: Saran_thermal@yahoo.co.in

S. Jaisankar

Department of Mechanical Engineering,
Star Lion College of
Engineering and Technology,
Thanjavur, Tamilnadu 614 206, India
e-mail: murukar@yahoo.com

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received July 30, 2018; final manuscript received March 2, 2019; published online April 16, 2019. Assoc. Editor: Ali Khounsary.

J. Heat Transfer 141(6), 062001 (Apr 16, 2019) (9 pages) Paper No: HT-18-1487; doi: 10.1115/1.4043172 History: Received July 30, 2018; Revised March 02, 2019

In this present work, the influence of corrugated booster reflectors (CBR) in a centrally finned twist (CFT) inserted solar thermal collector (SC) on heat transfer and thermal performance characteristics has been approached experimentally. The experimental trials have been made with two different twist ratios (Y = 3 and 6) for typical twist (TT) and CFT under same working conditions. The results were compared with the plain tube SC with CBR plain and also with the plain tube SC with flat booster reflectors (FBR plain). The experimental result of the CBR plain has been verified with the standard equations and found the deviations within ±10.05% for Nusselt number and ±9.42% for friction factor. The CBR has 1.6% higher effective reflection area than the FBR. Hence, the CBR augmented the Nusselt number around 8.25% over the FBR. When compared to the CBR plain, the CFT of minimum twist ratio (Y = 3) offered 10.09% higher thermal efficiency. In addition, empirical correlations have been derived for predicting the Nusselt number and friction factor. The deviations of the predicted value from the experiment value fall within ±10.62% for Nusselt number and ±11.28% for friction factor.

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Fig. 1

Dimension and orientation of booster reflectors

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Fig. 2

(a) Layout of experimental setup and (b) top view of experimental setup

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Fig. 3

(a) Cross section of solar thermal collector (b) Geometry of CBR

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Fig. 4

Pictorial view of TT and CFT with twist ratios Y = 3 and 6

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Fig. 5

Justification of Nusselt number for plain tube CBR SC

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Fig. 6

Justification of Friction factor for plain tube CBR SC

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Fig. 7

Comparison of Nusselt number for plain tube SC with CBR and FBR

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Fig. 8

Effect of CBR solar collector with CFT and TT on Nusselt number

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Fig. 9

Effect of CBR solar collector with CFT and TT on Friction factor

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Fig. 10

Effect of CBR solar collector with CFT and TT on thermal performance

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Fig. 11

Variation of PEC with Reynolds number

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Fig. 12

Experimental versus Predicted values for Nusselt number validation

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Fig. 13

Experimental versus predicted values for Friction factor validation



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