A considerable increase in the available energy from a double-storage solar water heater (SWH) can be achieved by an open loop control of the transfer flow rate (TFR) between the main water storage tank, which is attached to the collector, and a secondary storage tank. The optimal TFR profile, which is based on a priori-known load profile, weather, and solar radiation patterns, ensures minimal auxiliary energy requirement to meet load demands. The optimization is performed by comparing the evaluated system performance under various TFR profiles which are described by a sequence of step functions. Typical computations indicate that the utilized energy of a typical system may be increased by 10 to 30 percent while similar thermal efficiency optimization yields only a few percent improvement.
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February 1991
Research Papers
An Optimal Open-Loop Flow Control for Double-Storage Solar Water Heaters
E. Dgany,
E. Dgany
Elisra Electronic Systems, Ltd., Bene Beraq 51203, Israel
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M. Sokolov
M. Sokolov
Tel-Aviv University, Tel-Aviv 69978, Israel
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E. Dgany
Elisra Electronic Systems, Ltd., Bene Beraq 51203, Israel
M. Sokolov
Tel-Aviv University, Tel-Aviv 69978, Israel
J. Sol. Energy Eng. Feb 1991, 113(1): 19-24 (6 pages)
Published Online: February 1, 1991
Article history
Received:
September 11, 1989
Revised:
August 28, 1990
Online:
June 6, 2008
Citation
Dgany, E., and Sokolov, M. (February 1, 1991). "An Optimal Open-Loop Flow Control for Double-Storage Solar Water Heaters." ASME. J. Sol. Energy Eng. February 1991; 113(1): 19–24. https://doi.org/10.1115/1.2929945
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