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Technical Brief

Efficiency Improvement of Photovoltaic Water Pumping Systems by Means of Water Flow Beneath Photovoltaic Cells Surface

[+] Author and Article Information
M. Habiballahi

Department of Mechanical Engineering,
Faculty of Engineering,
Shahid Bahonar University,
Kerman, Iran;
Energy and Environmental Engineering Research Center,
Shahid Bahonar University,
Kerman 76188-69366, Iran

M. Ameri

Department of Mechanical Engineering,
Faculty of Engineering,
Shahid Bahonar University,
Kerman 76188-69366, Iran;
Energy and Environmental Engineering Research Center,
Shahid Bahonar University,
Kerman 76188-69366, Iran
e-mail: ameri_mm@uk.ac.ir

S. H. Mansouri

Department of Mechanical Engineering,
Faculty of Engineering,
Shahid Bahonar University,
Kerman, Iran;
Energy and Environmental Engineering Research Center,
Shahid Bahonar University,
Kerman 76188-69366, Iran

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 April 1, 2014; final manuscript received February 10, 2015; published online March 17, 2015. Editor: Robert F. Boehm.

J. Sol. Energy Eng 137(4), 044501 (Aug 01, 2015) (8 pages) Paper No: SOL-14-1108; doi: 10.1115/1.4029932 History: Received April 01, 2014; Revised February 10, 2015; Online March 17, 2015

Efficiency of photovoltaic water pumping systems (PVPS) decreases remarkably as PV cells temperature rises, thus to improve the performance of such systems and their efficiency, PV cells temperature should be kept as low as possible. In this research, a PVPS with collectors installed beneath the panels was used to cool down the PV cells. Pumped water by the solar pump is divided into two parts: the first part joins the second one after passing through the collectors installed beneath the panels and flows to the outlet. The second part passing through the collectors cools down the PV panels and therefore increases the efficiency of PVPS. Effect of flow of water through these collectors on PV cells output power and efficiencies of PVPS were analyzed. Water used to cool down the panel was pump outlet flow; thus, no extra power was consumed to decrease PV cells temperature.

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References

Figures

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Fig. 1

Schematic diagram of the test rig (system)

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Fig. 2

The experimental setup consisting of collectors installed beneath the surface of the panels

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Fig. 3

Variation of irradiation intensity and ambient temperature during the test day

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Fig. 4

Flow rates variation of collectors in three cases at h = 16 m

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Fig. 5

Comparison of cells temperatures with and without cooling the cells at h = 16 m

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Fig. 6

Collectors' inlet and outlet water temperature, panels' face temperature, and daily ambient temperature for MFC = 274 L/hr at h = 16 m

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Fig. 7

Variation of cells voltages with and without cooling the cells during the test day at h = 16 m

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Fig. 8

Variation of cells currents with and without cooling the cells during the test day at h = 16 m

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Fig. 9

Comparison of cells power with and without cooling the cells at h = 16 m

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Fig. 10

Comparison of pump flow rates with and without cooling the cells at h = 16 m

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Fig. 11

Comparison of cells efficiencies with and without cooling the cells at h = 16 m

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Fig. 12

Comparison of total system efficiencies with and without cooling the cells at h = 16 m

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Fig. 13

Comparison of subsystem efficiencies with and without cooling the cells at h = 16 m

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Fig. 14

Panel mean efficiency comparison according to the mean flow passing the collector

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