For access to this article, please select a purchase option:
IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.
Your recommendation has been sent to your librarian.
This paper deals with the comparative study on visual comfort level as experienced by the occupants in a daylit room and is assessed by the parameter DGI (daylight glare index) - a measure of discomfort glare level due to window. Matlab programs are developed to compute DGI values corresponding to a set of occupant's position and directions of view. Four window orientations, viz. N, E, S, W and two directions of view, viz. directed to the window and 45° away from the window are considered for the assessment of visual comfort. The assessment is done on the basis of computed DGI compared with the three reference values of DGI, viz. 22, 24 and 28 representing “Acceptable”, “Just uncomfortable” and “Just intolerable” discomfort glare respectively for three different seasons, summer, winter and equinox. Here, coloured glass Oceanic Blue, manufactured by Asahi India Glass Ltd (AIS) is considered as glazing material for window.
Inspec keywords: brightness; optical glass; optical computing; optical windows; daylighting; Matlab
Subjects: Optical shutters, windows, diaphragms, deflectors, choppers, and scanners; Optical glass; Optical computing techniques; Optical materials