Differential Cone Optics with Application to Multiple Reflection Solar Concentrators with Random Surface Normal Errors
The development of a differential cone optics approach to determine flux distributions which result from arbitrary multiple reflection solar concentrators with random surface normal errors provides more accurate evaluation than is possible with Monte Carlo ray tracing methods. Traditional methods do not adequately account for random mirror surface normal errors. Flux distributions are obtained for ideal and non-ideal Cassegrainian concentrators, as well as an exact analytical expression for the flux distribution peak for ideal reflectors. The differential cone optics method employs integrals over solid angles to express concentration at an arbitrary target point. Random mirror surface normal errors are represented by translationally invariant probability distribution functions. Procedures are developed to reduce machine computation time for evaluation of the integrals, and the computer code developed may be used for Cassegrainian concentrators of any eccentricity and rim angle.
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