Solar Collector Parameter Identification From Unsteady Data by a Discrete-Gradient Algorithm

[+] Author and Article Information
G. B. Hotchkiss

Texas Instruments Incorporated, Dallas, Texas

L. C. Burmeister

Mechanical Engineering Department, The University of Kansas, Lawrence, Kansas 66045

K. A. Bishop

Chemical and Petroleum Engineering Department, The University of Kansas, Lawrence, Kansas 66045

J. Sol. Energy Eng 107(1), 70-77 (Feb 01, 1985) (8 pages) doi:10.1115/1.3267658 History: Received March 01, 1982; Online November 11, 2009


A discrete-gradient algorithm is used to identify the parameters in a one-node and a two-node capacitance model of a flat-plate collector. Collector parameters are first obtained by a linear-least-squares fit to steady state data. These parameters, together with the collector heat capacitances, are then separately determined from unsteady data by use of the discrete-gradient algorithm with less than 10 percent deviation from the steady-state determination. All data were obtained in the indoor solar simulator at the NASA Lewis Research Center.

Copyright © 1985 by ASME
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