Abstract
Automated shading systems have the potential to exploit daylight in buildings to save energy of artificial lighting and cooling loads and improve occupants’f visual comfort. This paper investigates the daylighting performance of automated Venetian blinds based on sky luminance monitoring and lighting computation in winter. ‘fIn-situ’f experiments were carried out in a daylighting test module when the solar elevation angle was 21.7. at noon. Experimental results showed the automated shading was able to maintain work-plane illuminance within [500, 2000] lux range for 88% of the working time under a clear sky and for 83% of the working time under a partly cloudy sky, while mitigating discomfort glare for occupants.
Highlights
Daylight is a free source of energy and has a significant potential to save artificial lighting and heating loads in buildings
This paper investigates the daylighting performance of automated Venetian blinds based on sky luminance monitoring and lighting computation in winter. ’In-situ’ experiments were carried out in a daylighting test module when the solar elevation angle was 21.7◦ at noon
The work-plane illuminance (WPI) without shading protection surged above 10,000 lux between 10:00 and 15:00 for five hours, the automated external Venetian blinds (EVB) maintained the WPI within the [500, 2000] lux range for 88% of the whole working time
Summary
Daylight is a free source of energy and has a significant potential to save artificial lighting and heating loads in buildings. Various automated shading systems have been proposed and investigated by researchers and practitioners. A peak cooling load reduction of 28% was reported by Lee et al [4] compared with static blinds with horizontal slats during summer in Oakland, CA, those shading systems cannot prevent discomfort glare for occupants, which was a major rejection factor of users. With the proliferation of researches on visual comfort, cameras have been investigated recently in multiple studies for shading control to monitor and mitigate discomfort glare. Goovaerts et al [5] used a calibrated camera pointing at Venetian blinds to monitor and calculate the Daylight Glare Probability (DGP) [6] for assessing the level of discomfort glare for occupants.
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