Aiming Scheme for Flux Control on Molten Salt Receiver

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Paul Gilman
Aiming Scheme for Flux Control on Molten Salt Receiver

What is the aiming scheme in SAM for flux control on the molten salt power tower receiver?

SAM's power tower models use SolarPILOT's aiming method, which is called “Image size priority.”
The image size priority aiming method determines heliostat aim position by sequentially placing heliostats on the receiver at points of lowest flux. The order in which images are placed is determined by the size of the image as it appears on the receiver. Therefore, images with significant distortion or at long distance from the receiver are typically placed first. After each heliostat placement, SolarPILOT identifies a local minimum in the flux intensity and locates the subsequent heliostat at that position.
Heliostat aim points are placed within an allowable region that is determined by the size of image and the positioning cutoff factor. The allowable region is offset from the edges of the receiver equal to a distance that is the product of the image size standard deviation times the positioning cutoff factor. As the image size or positioning cutoff factor increases, the allowable placement region contracts.
The positioning cutoff factor multiplies the primary vertical length of the image to scale the heliostat aiming position offset from the edges of the receiver. As the positioning cutoff value increases, the offset distance between the heliostat and edges increases. The value is set to 2.5 for SAM.
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