Empirical evaluation of solar radiation, sky luminance, and daylight prediction models

This study utilizes empirical data collected at the daylight measurement st ation at the National University of Singapore to (1) evaluate the performan ce of SOLARIS-a computational tool for the prediction of irradiance on any arbitrarily oriented surface at any geographical location; (2) assess the r eliability of five algorithms for the prediction of-sky luminance distribut ion; and (3) evaluate the effectiveness of outdoor irradiance and luminance prediction algorithms for the simulation of indoor illuminance levels in a test space.