A half-factorial, two-level experimental design is used to determine the effects of changes in collector area, storage tank volume, collector flow rate, recirculation flow rate, and storage tank design on thermal rating of a solar drain-back water heating system. Experimental ratings are determined in accordance with the Solar Rating and Certification Corporation guidelines. Storage tank design is varied by using a stratification manifold in place of the standard drop tube. Variations in other component sizes and operating factors are based on current industry standards. Statistical analyses indicate that a change in collector area accounts for nearly 90 percent of the variation in heat output. Doubling collector area from 2.78 m2 to 5.56 m2 increases delivered solar energy by 31 percent. Use of a stratification manifold increases the delivery of solar energy by six percent. Doubling collector flow rate from 0.057 to 0.114 1/s increases solar output by approximately three percent; however, the increase in pumping energy outweighs the benefits of increasing collector flow rate. The effects of recirculation flow rate and tank volume are obscured by experimental error.
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November 1992
Research Papers
Impact of Component Selection and Operation on Thermal Ratings of Drain-Back Solar Water Heaters
J. H. Davidson,
J. H. Davidson
Solar Energy Applications Laboratory, Colorado State University, Fort Collins, CO 80523
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W. T. Carlson,
W. T. Carlson
Solar Energy Applications Laboratory, Colorado State University, Fort Collins, CO 80523
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W. S. Duff
W. S. Duff
Solar Energy Applications Laboratory, Colorado State University, Fort Collins, CO 80523
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J. H. Davidson
Solar Energy Applications Laboratory, Colorado State University, Fort Collins, CO 80523
W. T. Carlson
Solar Energy Applications Laboratory, Colorado State University, Fort Collins, CO 80523
W. S. Duff
Solar Energy Applications Laboratory, Colorado State University, Fort Collins, CO 80523
J. Sol. Energy Eng. Nov 1992, 114(4): 219-226 (8 pages)
Published Online: November 1, 1992
Article history
Received:
November 1, 1991
Revised:
May 1, 1992
Online:
June 6, 2008
Citation
Davidson, J. H., Carlson, W. T., and Duff, W. S. (November 1, 1992). "Impact of Component Selection and Operation on Thermal Ratings of Drain-Back Solar Water Heaters." ASME. J. Sol. Energy Eng. November 1992; 114(4): 219–226. https://doi.org/10.1115/1.2930009
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