Proportional Versus On/Off Control: A Detailed Comparison

[+] Author and Article Information
P. Naumann, R. Wolfson

Department of Physics, Middlebury College, Middlebury, Vt. 05753

J. Sol. Energy Eng 106(4), 423-427 (Nov 01, 1984) (5 pages) doi:10.1115/1.3267621 History: Received February 01, 1984; Online November 11, 2009


Through a series of single-day experiments, we have compared in detail the performance of on/off and proportional control strategies for solar hot water systems. The experiments encompass a variety of meteorological conditions, and include start-up with both warm and cool storage tanks. Insolation, tank temperatures, and pump energy use are monitored nearly continuosly throughout the day. Results show a consistent advantage in thermal energy gain for proportional control, especially under conditions of low or variable insolation, although proportional control requires considerably more parasitic pumping energy under these conditions.

Copyright © 1984 by ASME
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