Abstract
A computer model to evaluate and optimize the light gain produced by downwardly transmitting or reflecting low elevation winter sunlight is described. Verification of the model is by comparison with the experimental enhancement of winter sunlight provided by two different prismatic arrays. One, of perspex, redirects light both southerly and northerly, the other, of glass, is mounted to transmit light only. Manufacturing irregularities, such as curvature induced in nominally flat prism surfaces, are successfully encompassed within the model and can be used as additional design parameters.
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