A Procedure for Calculating the Heating Temperatures of Flat Transparent Screens for Solar Power Plants

A nonstationary numerical procedure and program for determining the heating temperature through flat “transparent screens” (TSs) of solar power plants have been developed. The developed procedure makes possible to consider volume absorption of incident and self-radiation of TSs. The program is verified according to mean equilibrium heating temperatures for the glass under a stationary mode of operation. We obtained that under a TS thickness up to 10 mm, the difference between mean equilibrium temperatures is lower than 0.1%. We reveal that a temperature drop in TSs of solar power plants even for glass with a thickness up to 5 mm and if the receiver is heated up to 60°С is not higher than 0.5–0.7°С. We obtain the same gradients in the numerical models for TSs with surface absorptance and heat spectrum emission, but the difference between absolute temperatures can run up to 6°C. The procedure and the program with volume absorption and emission in TSs can be used in nonstationary heat models for solar collectors and energy efficient windows and under heating 1D semi-transparent bodies by solar or laser radiation.

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