A full 34 factorial experimental design for efficiency optimization of an unglazed transpired solar collector prototype

Solar Energy, Volume 86, Issue 9, September 2012, Pages 2802-2810
Messaoud Badache, Stephane Halle, Daniel Rousse

Technologies of Energy and Energy Efficiency Industrial Research Chair (t3e), Ecole de Technologie Superieure, Universite du Quebec, 1100 Notre-Dame St. West, Montreal, Canada H3C 1K3



The goal of this study was to model and optimize the thermal performance of an unglazed transpired solar collector (UTC) prototype using a full factorial experiment with four factors (hole diameter, absorber coating, irradiation and mass flow rate) at three levels. A quadratic polynomial model for efficiency was shown to explain 95.47% of the variance of thermal output. Residuals analysis and analysis of variance were used to validate the best-fit model. Finally, the model was optimized using response surface representations. An optimal combination of levels of the four parameters was obtained to provide a collector efficiency of 70–80%. The chosen experimental methodology provided accurate characterization of the parameters that have the greatest impact on UTC performance.

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