Performance Prediction by Modelling of a Light-pipe System used under the Climate Conditions of Korea

Abstract

A light-pipe system can introduce daylight into the deeper building interiors, thus potentially displacing the requirement for electrical lighting. For the light-pipe system to be widely used in Korea, it is important to quantify its daylighting performance with due consideration regarding the effects imposed by the local climate conditions. This paper reports the development of a model to predict the daylighting performance of a light-pipe system used in Korea. This model study was based on the monitoring data obtained from a window-less space in which the light-pipe system was installed. The model can predict indoor illuminance distributions and daylight penetration factors as a function of outdoor illuminance, solar altitude and the amount of cloud present. Comparisons were made between the predicted and the monitored data obtained from the study; and also between predictions given by the developed model and other existing predictive models. The comparisons have provided validation of the newly developed model and that the predicted results were robust and reliable.