Comparison of Experimental and Simulated Thermal Ratings of Drain-Back Solar Water Heaters

[+] Author and Article Information
J. H. Davidson, W. T. Carlson, W. S. Duff

Solar Energy Applications Laboratory, Colorado State University, Fort Collins, Colorado 80523

P. J. Schaefer, W. A. Beckman, S. A. Klein

Solar Energy Laboratory, University of Wisconsin, Madison, WI

J. Sol. Energy Eng 115(2), 101-105 (May 01, 1993) (5 pages) doi:10.1115/1.2930026 History: Received August 01, 1992; Revised December 01, 1992; Online June 06, 2008


Short-term experimental tests of drain-back solar water heaters are compared to ratings obtained using TRNSYS to determine if computer simulations can effectively replace laboratory thermal ratings of solar domestic hot water heating systems. The effectiveness of TRNSYS in predicting changes in rating due to limited changes in collector area, collector flow rate, recirculation flow rate, storage tank volume, and storage tank design is validated to within ±10 percent. 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.

Copyright © 1993 by The American Society of Mechanical Engineers
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