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Research Papers

Thermal Performance Analysis of a Rectangular Longitudinal Finned Solar Air Heater With Semicircular Absorber Plate

[+] Author and Article Information
Satyender Singh

Department of Mechanical Engineering,
National Institute of Technology,
Hamirpur 177005,
Himachal Pradesh, India
e-mail: satyender.nith@gmail.com

Prashant Dhiman

Department of Mechanical Engineering,
National Institute of Technology,
Hamirpur 177005,
Himachal Pradesh, India
e-mail: prashant_rec@yahoo.co.in

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 March 13, 2015; final manuscript received November 5, 2015; published online December 8, 2015. Assoc. Editor: Werner Platzer.

J. Sol. Energy Eng 138(1), 011006 (Dec 08, 2015) (9 pages) Paper No: SOL-15-1066; doi: 10.1115/1.4032010 History: Received March 13, 2015; Revised November 05, 2015

Thermal performance of a single-pass single-glass cover solar air heater consisting of semicircular absorber plate finned with rectangular longitudinal fins is investigated. The analysis is carried out for different hydraulic diameters, which were obtained by varying the diameter of the duct from 0.3–0.5 m. One to five numbers of fins are considered. Reynolds number ranges from 1600–4300. Analytical solutions for energy balance equations of different elements and duct flow of the solar air heater are presented; results are compared with finite-volume methodology based numerical solutions obtained from ansys fluent commercial software, and a fairly good agreement is achieved. Moreover, analysis is extended to check the effect of double-glass cover and the recycle of the exiting air. Results revealed that the use of double-glass cover and recycle operation improves the thermal performance of solar air heater.

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Figures

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Fig. 1

Schematic diagram of the finned solar air heater with (a) single-glass single-pass, (b) double-glass single-pass, and (c) double-glass recycled air

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Fig. 3

(a) Isometric view of the meshed domain and (b) cross-sectional veiw of the meshed domain

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Fig. 2

ansys fluent employment process

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Fig. 5

Contours of the velocity distribution for different numbers of fins at various locations

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Fig. 4

Contours of the temperature for different numbers of fins at various locations

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