Physics For Civil Engineering: Unit III: Acoustics and Lighting Designs
Use of Models and Artificial Skies
predict daylight penetration into any building
Model studies can be used to predict daylight penetration into any building. This is the only reliable prediction method in the case of unusual situations, complex geometries or heavily obstructed windows.
USE OF MODELS AND ARTIFICIAL SKIES
Model
studies can be used to predict daylight penetration into any building. This
is the only reliable prediction method in the case of unusual situations,
complex geometries or heavily obstructed windows.
Model studies can be carried out under
outdoor conditions, but the limitations imposed by weather variations can be
quite severe.
The artificial sky simulates the
standard overcast sky conditions, giving uniform luminance.
Forms of aritificial sky
There
are two basic forms of artificial sky:
(i)
Hemispherical artificial sky
(ii)
Rectangular artificial sky 0 23
Hemispherical (Dome shaped) artificial sky
The hemispherical artificial sky may be
a diffusely reflective opaque dome surface, illuminated from below, or a
translucent dome (hemispherical), with lighting mounted behind (Fig. 3.14).
The rectangular artificial sky has a
luminous ceiling and four strictly vertical walls lined with mirrors. The
multiple reflections between accurately vertical walls lined with mirrors give
an infinite horizon effect.
The
mirror glass absorption through multiple reflections ensures a luminance
distribution (Fig. 3.15).
Physics For Civil Engineering: Unit III: Acoustics and Lighting Designs : Tag: : predict daylight penetration into any building - Use of Models and Artificial Skies
Physics For Civil Engineering: Unit III: Acoustics and Lighting Designs
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Physics for Civil Engineering
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