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.
Solar Collector Parameter Identification From Unsteady Data by a Discrete-Gradient Algorithm
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Hotchkiss, G. B., Burmeister, L. C., and Bishop, K. A. (February 1, 1985). "Solar Collector Parameter Identification From Unsteady Data by a Discrete-Gradient Algorithm." ASME. J. Sol. Energy Eng. February 1985; 107(1): 70–77. https://doi.org/10.1115/1.3267658
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