A Computational Model for the Optical Efficiency of the Heliostat
The heliostat field serves to reflect sunlight onto the absorber collector positioned within the mirror field,facilitating energy conversion.Various parameters within the heliostat field play a pivotal role in influencing its optical efficiency.In this study,we formulate a model for calculating the optical efficiency of the heliostat field through the implementation of ray tracing methodology and coordinate transformation.To begin with,our approach involves the establishment of a geodetic coordinate system,mirror coordinate system,and light cone coordinate system.We further develop the mathematical model for incident and reflected light within these systems.Subsequently,we establish coordinate transformations among the mirror,earth,and light cone coordinate systems.Through the utilization of coordinate transformation matrices and equations,we assess and compute shading efficiency,cosine loss,and efficiency of truncation.Finally,the optical efficiency of each mirror within the heliostat field is determined based on mirror reflectivity and atmospheric transmittance.
heliostat fieldoptical efficiencyefficiency of truncationshading efficiency
万方数据
维普
