Building Envelope is the best tool to work-upon for generating energy and changing the Micro Climate .

1. SHADING
DEVICES
RICHA MALIK
Assistant Proffesor , B.Arch, M.Arch
ENERGY SIMULATION
AND THEIR IMPACT ON BUILDING THERMODYNAMICS
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Shading Devices
•The use of shading device is an important aspect of
many high-performance building design strategies.
• It has been proved that the use of shading device could
improve building energy performance, prevent glare,
increase useful daylight availability (between
100~2000lux) and create a sense of security.
• Realizing these potential benefits, a varied of shading
configurations have been invented and put in the market,
such as fixed, manual and automatic movable, internal
and external shading device.
•Accordingly, many simulation tools have been developed
to support shading design.

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Exterior shading device
•Exterior shading device is primary used to control sunlight penetration to the interior of buildings.
•Such shading devices are always attached on the mullion as a separate component of building
envelop, but can also be achieved by disposition of the building floors to create overhangs.
•Exterior shading device decrease direct beam penetration by projecting shadow on the
window along the sunlit direction;

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Types of exterior shading device
•Two basic types of exterior shading
device are
• Horizontal & Vertical
• Various combination of these creates
many configurations to accommodate
different envelop shapes and
orientations.
Each orientation of the building requires a different approach to the design of shading.
The north elevation (in the northern hemisphere) essentially does not require shading because
except in the summer months in the early morning and late evening, no sun penetration occurs.

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-the length of the projection is determined as a geometric function of the height of the window and the
angle of elevation of the sun at solar noon.
- Such shading devices can be designed to completely eliminate sun penetration in the summer and
allow for complete sun penetration during the winter when such is desired for passive heat gain.
Basic Shading Strategy for a South
Elevation
Horizontal shading devices are suited to southern exposures.
Roof overhangs can also easily be used to shade southern exposures on low rise buildings.
SOUTH SIDE ORIENTATION

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In order to obtain shading in the late morning and
early afternoon when the sun is not at its high
point, the shading device should be extended
either side of the window opening.
Elevation of Shading Device
Configurations for South
Facing Facades
SOUTH SIDE ORIENTATION

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The east and west elevations are both difficult to shade.
In east direction we receives early morning sun and from
west direction we receives evening sun
Its angle is also low enough to preclude shading using
overhangs.
Shading can be
provided in the
way of landscaping
and foliage
Shading Devices for Non Southern Exposures
EAST AND WEST SIDE ORIENTATION

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Other shading devices
Besides attaching shading device on exterior of building envelop,
many other ways can also prevent sun light from penetrating to
the interior of buildings.
•Interior shading device
•Building self-shading
•Shaded by trees and other obstructions

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Shading Devices in IHC
The reflectors are installed above the
building to provide shade and prevent sun
from entering into the building. The
reflectors are aligned at an angle which
reflect back 70% of the sunlight and change
their angle during winter to allow sunlight to
fall on the windows.
Sun shading devices are incorporated into
the design of the facade and the
overhanging floors of each level to provide
sufficient shade to ensure a comfortable
environment within the dining and office
spaces

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Solar shading device for high-rise buildings
The external shading system sits like a
skin on the outside of a building, moving
around on tracks to shield the sun while
still allowing daylight to penetrate.
Made from a lightweight frame incorporating
photovoltaic cells, the sunshield:
•reduces the energy required to light and cool the
building by 30%;
•produces enough energy to power the movement of
the shade and provide up to 10% of the building
remaining power needs;
•is made from a simple and cost-effective series of
modular panels, which can be removed individually
without compromising the whole system; and
•incorporates a guide rail at each floor level to provide
both structural support and access for cleaning and
maintenance.
Solar Louvers minimizes
glare & over heating

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Solar shading device for high-
rise buildings
Dan M. Russell Jr. U.S. Courthouse
To support the U.S. Governments efforts to construct
energy efficient buildings, this courthouse features C/S
Sun Controls on five stories of this buildings southern
elevation.

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