Journal
ENERGY
Volume 256, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2022.124633
Keywords
Solar power tower; Flux density distribution; Sunshape; Optical errors
Categories
Funding
- National Natural Science Foundation of China [52090064, 51821004]
- Interdisciplinary Innovation Program of North China Electric Power University
- Project of State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources [LAPS2020-01, LAPS2020-11]
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Calculating and evaluating the spillover of flux reflected by heliostats on the heat shields is crucial for the construction, operation, and optimization of solar thermal power tower plants. The authors established a concentrated flux distribution model based on the real sunshape and considered various factors to calculate the flux density distribution on the receiver and heat shields under different conditions. The results indicate that the radiation energy on heat shields accounts for 1%-8% of the total received energy of the system under typical conditions.
It is important to calculate and evaluate the spillover of flux reflected by heliostats on the heat shields for the construction, operation and optimization of solar thermal power tower plant. By establishing a concentrated flux distribution model of power tower plant based on the real sunshape and taking haze, optical error, shadowing and blocking effect into consideration, the authors calculated the flux density distribution on the receiver and heat shields under various conditions. The results show that the radiation energy on heat shields can reach about 15-45 MW under typical conditions, accounting for 1%-8% of the total received energy of the system. The flux density on heat shields is between 30 and 70 kW/m2, which is equivalent to the flux level of trough solar concentrator system. The calculations and fitting results show that the energy proportion on heat shields is positively correlated with circumsolar ratio(CSR) and optical error. The effect of CSR on the energy proportion of heat shields is linearly increasing, while the effect of optical error is nonlinear. This indicates that the spillover flux on heat shields can compensate for the loss of the receiver caused by haze, optical errors of heliostats. (c) 2022 Elsevier Ltd. All rights reserved.
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