Abstract
A computer model is discussed for estimating the annual energy performance of a daylighted building. The model is designed for inclusion into larger building energy simulation programs such as DOE-2, BLAST, and NBSLD, where it will provide means of evaluating the impact of daylighting as it relates to the building's total energy requirements. Algorithms have been developed for determining hourly sky conditions, hourly interior daylight, and hourly adjusted electric lighting load. Comparisons with field measurements show a correlation in most cases within 30 percent of real conditions.
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