The Importance Of Daylight In Architecture

Daylight is a source which can save the energy use and it is able to create a pleasant environment and a sound visual comfort for building occupants. A good day-lighting strategy is necessary in order to decrease energy consumption of artificial lighting. To provide effective internal illumination, the placing of the right openings in the right positions with suitable type of window and glazing is important. The type of glazing and window has major significance on the performance of daylight and thermal performance in buildings. By having a good day-lighting approach, one can have a visually sound and productive environment for building occupants.
Li et. al. (2006) believes that the performance of daylight entering into the area depends
on

Fenestration and its variable components
(a) Size, position and orientation of windows affect sun penetration i.e. solar heat gain, but also affect ventilation, especially where cross ventilation is desirable.
(b) Glass: single, double, multiple and glass quality: special glasses (heat absorbing or heat reflecting glasses) may be used to improve an otherwise bad situation, by reducing the solar heat gain.
(c) Closing mechanism: fixed glass, louvers, opening sashes, type of sashes used (Fig.1)
(d) Internal blinds and curtains can slightly reduce the solar heat gain, by reducing the beam
(direct) radiation, but they become heated and will re-emit that heat, thus causing convective gains. (e) External shading devices are the most positive way of controlling solar heat gain. The effect of such devices on wind (thus ventilation) and on day-lighting and views must be kept in mind.
(f) Insect screens (part of fenestration) may be a necessity in hot and humid climates (with their large insect population), but their effect on air flow and on day-lighting must be recognised. Air flow may be reduced by 30% even by the best, smooth nylon screen and