Interactions between louvers and ceiling geometry for maximum daylighting performance

Abstract

a b s t r a c tThe impact of ceiling geometries on the performance of louvers was investigated using physical model experiments and Radiance simulations. Two performance indicators, the illuminance level and its distribution uniformity, were used to assess daylighting performance in a room located in a subtropical climate region. It was found that the performance of the louvers can be improved by changing the ceiling geometry. The illuminance level increased in the rear of the room, and decreased in the frontdnear the windowdcompared to rooms having horizontal ceilings. Radiance results were found to be in good agreement with physical model data obtained under a clear sky and high solar radiation. Louvers' daylighting performance was reduced by tilting the louvers downward. The best ceiling shape was found to be one that is chamfered in the front and rear of the room.

Dynamic internal light shelf for tropical daylighting in high-rise office buildings

“…Therefore, physical scaled models were used to validate the results of the IES-Radiance simulation. Physical scaled model is able to replicate the behavior of light in a full-scale building [1,2,36,37] as previous research has also shown the performance and accuracy of the model in portraying daylight performance under actual sky conditions [31,32,38,39].…”

Developing daylight devices matrix with special integration with building design process

“…Variables affecting louvre daylight performance include width, distance between louvres, orientation and ceiling height. Freewan, Shao, and Riffat (2009) studied the effect of ceiling shape on louvers' performance in hot climate regions.…”

Effect of external shading and window glazing on energy consumption of buildings in Bangladesh

“…Overhangs are currently widely used, providing solar protection for glazed spaces and reducing loads during the cooling season. Some studies on the effect of louvres on a building's thermal performance and day-lighting performance (Freewan, Shao, & Riffat, 2009) have been carried out. Tzempelikos (2008) have given an overview of past and current approaches for computing the optical properties of shading devices.…”