Optimization of a Parabolic Reflector for Use in a Two-Stage Solar Concentrator

Abstract

A background of concentrated solar power, and finite element analysis are provided, along with further technical details on the physics of parabolic light concentration and classical plate theory. The concept of optical efficiency is outlined, including the 5 contributing factors: the cosine effect, mirror reflectivity, blocking and shadowing, atmospheric attenuation, and surface irregularities. Surface irregularities are identified as the least predictable factor of optical efficiency, making them the subject of the experimental section. Physical and computational experimentation is conducted to determine a desirable selection for material of reflector substrate, thickness of reflector substrate, holding method of reflector, and aspect ratio of reflector. Physical and computational results are compared with one another to add validity to both sets of results. Recommendations are made for each design criteria selection, however it is found that in many cases the selection of reflector properties falls to an economic decision.