This paper aims to assess how occupants perceived their visual environments of diverse luminous ambiences created by daylight in apartment buildings. Daylighting can have a large influence on environmental condition to improve ambience, visual comfort, well-being and health of occupants. Thus, it is essential to understand what visual adaptive actions for the satisfaction of occupants and how they respond to given visual environments. A purpose-built living room with balcony extension was situated at Kyung Hee University in Korea (latitude 37.17N, longitude 127.01E) to monitor data throughout a 1-month period in winter. Thirty-two subjects participated and each subject spent a day in the test room. All subjects were given the opportunity to have artificial lighting and blinds control over the lighting ambience appropriate for their activity. Physical measurements such as illuminance levels of vertical and floor-planes, window luminance were monitored simultaneously which were cross-linked to the subjective assessment of blinds control. Experimental results revealed the factors affecting the occupant use of shading systems; visual comfort, seating orientation and blinds types could have an effect. The results of this study should provide useful information on daylighting as a function of photometrical and behavioural factors for future application in building design.
The use of natural lighting has the potential for improving both the energy efficiency and indoor environmental quality in buildings. A light-pipe system can bring natural light to spaces that would otherwise not be able to benefit from the advantages of daylight penetration. This paper presents the monitoring results of a light-pipe system that was installed in a window-less space of a building located in Korea. Indoor illuminance distributions and concurrent outdoor illuminance were monitored at a 1 s interval over a period from April 2009 to May 2009. The results demonstrated the effects caused by the amount of clouds, solar altitudes and external total illuminances; on both the daylighting performance of the light-pipe system and the indoor illuminance distributions of the space. The findings of this study indicated that the light-pipe system could be an effective tool particularly for introducing daylight indoors, even under overcast sky conditions in Korea.
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