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Research Papers

Energy and Exergy Study of Effective Parameters on Performance of Photovoltaic/Thermal Natural Air Collectors

[+] Author and Article Information
M. Gholampour

Department of Mechanical Engineering,
Faculty of Engineering,
Shahid Bahonar University,
Kerman 76169-133, Iran

M. Ameri

Department of Mechanical Engineering,
Faculty of Engineering,
Shahid Bahonar University,
Kerman 76169-133, Iran
Energy and Environmental Engineering
Research Center,
Shahid Bahonar University,
Kerman 76169-133, 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 September 27, 2012; final manuscript received October 22, 2013; published online January 10, 2014. Editor: Gilles Flamant.

J. Sol. Energy Eng 136(3), 031001 (Jan 10, 2014) (11 pages) Paper No: SOL-12-1254; doi: 10.1115/1.4026250 History: Received September 27, 2012; Revised October 22, 2013

Photovoltaic/thermal (PV/T) system is a kind of solar system that converts solar energy to electrical and thermal energy simultaneously. In this paper, the effect of some parameters, such as packing factor, fin number, and fin height as well as environmental and dimensional parameters on the performance of the PV/T system with natural air flow from the energetic and exergetic viewpoint, has been studied. For this purpose, a theoretical model is developed and validated. Induced mass flow rate and PV temperature are well-predicted, compared with existing numerical data, available in the literature. It is found that thermal efficiency of the PV/T systems decreases slightly with the increase in packing factor, while PV efficiency increases sharply. The first-law efficiency and second-law efficiency of the system increase with the increase in the fin number and fin height. Also, results show that increasing exit diameter is a favorable factor from the first-law efficiency viewpoint, while it has an unfavorable effect on the second-law efficiency.

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Figures

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Fig. 2

Schematic of the studied PV/T air system with heat-transfer coefficients

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Fig. 1

Schematic cross-sectional view of PV/T air collectors: (a) without fins and (b) with fins

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Fig. 3

Flowchart for computer program

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Fig. 4

Variation of PV temperature and induced mass flow rate with channel depth for unglazed system with and without fins (results of the present study and Tonui and Tripanagnostopoulos [12])

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Fig. 5

Effect of channel depth on mass flow rate and PV temperature at different packing factors for unglazed condition

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Fig. 6

Effect of channel depth at different packing factors for glazed and unglazed condition on the (a) thermal efficiency, (b) PV efficiency, (c) first-law efficiency, (d) second-law thermal efficiency, and (e) second-law efficiency

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Fig. 7

Effect of (a) solar radiation, (b) ambient temperature, (c) wind speed, (d) collector length, and (e) exit diameter on the first-law efficiency and the second-law efficiency for glazed and unglazed conditions

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Fig. 8

Effect of fin number for glazed and unglazed conditions on the first-law efficiency and the second-law efficiency

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Fig. 9

Effect of fin height for glazed and unglazed conditions on the first-law efficiency and the second-law efficiency

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