References(16) This paper presents the energy saving effects in a building having automatically controlled lighting utilizing daylight inside perimeter zone. We have developed a computer program that enables to calculate capital and energy cost of a building in order to estimate the energy saving effects, and calculated many cases under various conditions, such as four types of window ratio to wall (20%, 35%, 50%, 65%), three operation types of venetian blind, etc. Finally we estimated these energy saving effiects by using a two-dimensional vector on a graph, on which the abscissa shows capital cost required and ordinate energy cost. By means of this vector on the graph, building owners can easily understand the energy saving effects of an automatically controlled lighting system utilizing daylight.
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