Abstract
The passive adjustment toroidal heliostat (PATH) concept is investigated as a means of improving solar field energy capture efficiency for a modular tower receiver developed by Solastor.3589 photos of heliostat images were captured for heliostat positions across the solar field at different seasons and times of day and calibrated to measure the capture efficiency of the receiver at eachlocation. The results were used to calibrate simulations of the solar field and then used to calculate the overall solar field capture efficiency.Results show that heliostats performed better than originally anticipated because of better mirror surface accuracy and improvements due to the passive adjustment system. With improvements to mirror reflectivity, approximately 3.35MWh per day could be captured by the Solastor receiver and a complete solar field at the Cooma site (DNI: 5.05kWh/m2/day).
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