Extract

Anidolic Daylighting System (ADS) is a light guide system that can distribute daylight into a
room, using a horizontal duct or pipe. In designing such a system, computational modelling and
simulation are a powerful tool to predict its performance. In that case, it is important to ensure that all relevant simulation parameters have been defined appropriately so that the results can be held reliable. This study, therefore, aims to investigate the impact of ambient parameters on the performance of ADS, using modelling and simulation. In this study, an isolated room with no windows is modelled and
rectangular ADS is modelled in the room. The inlet of the ADS is set with 60° angle, placed in the east
facade. The whole model is simulated in DAYSIM and Radiance, under the CIE overcast and Perez sky
model with climate data of Bandung, Indonesia. The Radiance simulation parameter of ambient bounce
(ab) is varied from 2 until 8. Daylight metric which is Daylight Factor (DF) is observed to determine the
sensitivity of ab parameter. The results suggest that ab parameter of 5 yields the best performance
regarding DF.

Keywords: Anidolic Daylighting System; Daylight; Radiance; DAYSIM.

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