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TECHNICAL PAPERS

Experimental Study of Energy Loss in Solar Energy Collectors With Wind Fences

[+] Author and Article Information
Dalmo G. Gomes, Nide G. C. R. Fico

Instituto Tecnológico de Aeronáutica, São José dos Campos, SP, Brazil 12228-900

J. Sol. Energy Eng 126(4), 1101-1104 (Nov 18, 2004) (4 pages) doi:10.1115/1.1800534 History: Received February 13, 2004; Revised May 17, 2004; Online November 18, 2004
Copyright © 2004 by ASME
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References

New Grolier Multimedia Encyclopedia, 1993, Release 6, Version 6.03, Grolier Inc.
Duffie, J. A., and Beckman, W. A., 1980, Solar Engineering of Thermal Processes, Wiley Interscience, New York.
Agarwal,  V. K., and Larson,  D. C., 1981, “Calculation of the Top Loss Coefficient of a Flat-Plate Collector,” Sol. Energy, 27, pp. 69–71.
Hottel,  H. C., and Woertz,  B. B., 1942, “Performance of Flat-Plate Solar-Heat Collectors,” Trans. ASME, 64, p. 91.
Tabor,  H., 1958, “Radiation, Convection and Conduction Coefficients in Solar Collectors,” Bull. Res. Counc. Isr., Sect. F, 6C, p. 155.
Bliss,  R. W., 1959, “The Derivations of Several ‘Plate-Efficiency Factors’ Useful in the Design of Flat-Plate Solar Heat Collectors,” Solar Energy Laboratory, Institute of Atmospheric Physics, University of Arizona, Tucson, Sol. Energy, 3, pp. 55–64.
Malhotra,  A., Garg,  H. P., and Rani,  U., 1980, “Minimizing Convective Heat Losses in Flat Plate Solar Collectors,” Solid-State Electron., 25, pp. 521–526.
Klein,  S. A., 1975, “Calculation of Flat-Plate Collector Loss Coeficients,” Solar Energy Laboratory, University of Wisconsin, Madison, U.S.A., Solid-State Electron., 17, pp. 79–80.
McAdams, W. H., 1954, Heat Transmission, 3rd ed., McGraw-Hill, New York.
ASHRAE, Standard 93-77, 1977, “Methods of Testing to Determine the Thermal Performance of Solar Collectors,” American Society of Heating, Refrigeration and Air Conditioning Engineers, New York.

Figures

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Schematics of a typical flat plate solar collector
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Flow over the solar collector equipped with wind barrier
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Top view of experimental apparatus setup mounted inside the laboratory
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Temperature drop vs Lp for wind velocity of 5 m/s and (Tin−Ta)=30°C
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Recirculation region length vs wind barrier height for a wind velocity of 5 m/s
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Visualization of the flow over the collector’s upper surface
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Temperature drop vs Lp for wind velocity of 5 m/s and (Tin−Ta)=60°C
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Temperature drop vs Lp for various wind velocity of and (Tin−Ta)=60°C,β⁁=0

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