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TECHNICAL PAPERS

New Approach for Analyzing Solar Collectors Subjected to Unequal Front/Rear Ambient Temperatures: The Equivalent Ambient Temperature Concept, Part 2: Validation and Implications for Design

[+] Author and Article Information
Kam T. K. Ho, Dennis L. Loveday

Department of Civil and Building Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, United Kingdom

J. Sol. Energy Eng 124(3), 268-275 (Aug 01, 2002) (8 pages) doi:10.1115/1.1488166 History: Received August 01, 1999; Revised February 01, 2002; Online August 01, 2002
Copyright © 2002 by ASME
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References

Ho,  K. T. K., and Loveday,  D. L., 2002, “New Approach for Analyzing Solar Collectors Subjected to Unequal Front/Rear Ambient Temperatures: The Equivalent Ambient Temperature Concept, Part 1: Modeling,” ASME J. Sol. Energy Eng., 124(3), pp. 262–267.
British Steel 1992, Colorcoat in Building. A Guide to Architectural Practice, British Steel Strip Products, May.
British Standards Institution 1986, Methods of Test for Thermal Performance of Solar Collectors BS 6757:1986, BSI, London.
Krusi,  P., and Schmid,  R., 1983, “The CSI 1000W Lamp as Source for Solar Radiation Simulation,” Sol. Energy, 30(5), pp. 455–462.
ASHRAE, 1986, Methods of Testing to Determine the Thermal Performance of Solar Collectors, American Society of Heating, Refrigerating and Air conditioning Engineers, Atlanta, USA.
ASTM 1979, Standard Test Methods for Solar Energy Transmittance and Reflectance (Terrestrial) of Sheet Materials, Annual Book of ASTM Standards, Part 46.
Duffie, J. A., and Beckman, W. A. 1991, Solar Engineering of Thermal Process, John Wiley and Sons, New York.
Phillips,  W. F., 1979, “The Effect of Axial Conduction on Collector Heat Removal Factor,” Sol. Energy, 23, pp. 187–191.
Ho, K. T. K., 1999, “The Potential of Covered Profiled Steel Cladding as a Building-Integrated Solar Collector for the UK Climate,” Ph.D. thesis, Loughborough Univ., Loughborough, UK.

Figures

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Schematic drawing of the simulator arrangement
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Efficiency characteristic (based on ta,av[=(ta+ta)/2]) for ta=18°C,ta=22°C,m=0.07 kg/s,I=363.6 W/m2, vertical orientation, (τα)e=0.68
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Efficiency characteristic (based on ta,av[=(ta+ta)/2]) for ta=18°C,ta=32°C,m=0.07 kg/s,I=363.6 W/m2, vertical orientation, (τα)e=0.68
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Efficiency characteristic (based on ta,av[=(ta+ta)/2]) for ta=18°C,ta=42°C,m=0.07 kg/s,I=363.6 W/m2, vertical orientation, (τα)e=0.68
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Efficiency characteristic (based on ta,av [=(ta+ta)/2]) for ta=18°C,ta=52°C,m=0.07 kg/s,I=363.6 W/m2, vertical orientation, (τα)e=0.68
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Experimentally-measured values for UL versus (ta−ta) for three surrounding ambient temperatures (ta,av,ta and ta*)
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Additional heat flow directions from the collector test section
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Useful heat collection rate versus rear/front temperature difference for ti=18°C and k2/d2=50,000 W/m2°C
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Useful heat collection rate versus rear/front temperature difference for ti=28°C and k2/d2=50,000 W/m2°C
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Comparison between the predicted and measured useful heat collection rate
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Overall heat loss coefficient versus rear thermal conductance for ti=1°C
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Overall heat loss coefficient versus rear thermal conductance for ti=20°C

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