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Research Papers

Design Considerations of Unglazed Transpired Collectors: Energetic and Exergetic Studies

[+] Author and Article Information
M. Gholampour

Department of Mechanical Engineering,
Faculty of Engineering,
Shahid Bahonar University,
Kerman, Iran
Energy and Environmental Engineering
Research Center,
Shahid Bahonar University,
Kerman, Iran

M. Ameri

Department of Mechanical Engineering,
Faculty of Engineering,
Shahid Bahonar University,
Kerman, Iran
Energy and Environmental Engineering
Research Center,
Shahid Bahonar University,
Kerman, Iran
e-mail: ameri_mm@mail.uk.ac.ir

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received August 6, 2013; final manuscript received November 29, 2013; published online January 10, 2014. Editor: Gilles Flamant.

J. Sol. Energy Eng 136(3), 031004 (Jan 10, 2014) (10 pages) Paper No: SOL-13-1219; doi: 10.1115/1.4026251 History: Received August 06, 2013; Revised November 29, 2013

Unglazed transpired collector (UTC) is a kind of solar air heater is used for different applications such as air ventilation, preheating, and crop drying. Passing air through the perforated plate, which acts as an absorber, is the main mechanism of heat transfer and air preheating in UTCs. In order to design UTCs and determine the effective parameters, energy and exergy analyses are performed. A mathematical model which is solved using an iterative method by a computer code has been developed. In order to validate the present model, this solution is compared with numerical and experimental results available in the literature, where a good agreement is obtained. After verifying the model, the code has been used to study the influence of the effective parameters on the performance of the system. The results show that the exergetic analysis is very important to design.

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References

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Summers, D. N., 1995, “Thermal Simulation and Economic Assessment of Unglazed Transpired Collector Systems,” Master thesis, University of Wisconsin, Madison, WI.
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McAdams, W. H., 1954, Heat Transmission, McGraw-Hill, New York.

Figures

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Fig. 1

Unglazed transpired collector mounted on the wall

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Fig. 2

Energy-flow diagram of entire system

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Fig. 3

Air temperature rise versus solar radiation at different suction velocities

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Fig. 4

(Fan power, η, ηII) versus hole diameter at different suction velocity and hole pitch

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Fig. 5

(Fan power, η, ηII) versus hole pitch at different suction velocity and hole diameter

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Fig. 6

(Fan power, η, ηII) versus suction velocity at different hole pitch and hole diameter

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Fig. 7

η and ηII versus plenum depth at different suction velocity and solar radiation

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Fig. 8

η and ηII versus amplitude corrugation at different suction velocity and wavelength corrugation

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Fig. 9

η and ηII versus wind velocity at different suction velocity and plate

Tables

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