 |
Daylighting
 |
Natural light is the preferred light source for the human beings. This perceptions, has now also been scientifically proven: People prefer daylight, be in the offices or in shop, as our children learn more and better in daylit school. Furthermore, daylight is a free sources, which is available throughout the normal office hour.
The challenge in daylight design of buildings is to design windows and shading which lets daylight in, prevent sunlight to enter the building, and reduces glare problems from the windows. In the MECM building, these criteria are achieved through a combination of exterior shading and a glazing, which allows 65% of the light through, and allows only 51% of the heat trough. |
The atrium allows daylight access to deeper parts of the building, thereby improving energy savings and user comfort.
In order to fully utilised daylight to offset artificial lighting,
the artificial has to be controlled so that it is automatically
shut off when daylight is sufficient to satisfy the lighting
need, which is an illumination level 300 – 400 lx. In
the LEO building, a daylight responsive control system on lighting
system is combined with a motion detector, which automatically
shuts off lighting and reduce cooling once an office is unoccupied.
In the future, advances glazing will become available. Glazing
that filters the sunlight such that visible light has preference
and the solar heat is avoided. These spectrally selective glazings
reflect the invisible infrared and ultraviolet and heat away
from the building. Such spectrally reflected glazings, which
normally will be combined with sealed double windows will significantly
improve energy efficiency of buildings, and more architectural
freedom with respect to façade design will be possible.
Glazing Properties of the Windows
|
|
 |
|
