Shading devices

SHADING DEVICESPresentation By- Ar. Roopa Chikkalgi

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FUNCTION OF SHADING DEVICES

Solar radiation entering a room can have three effects :

• Radiation absorbed on to room surfaces will lead to an increase in airtemperature.

• Solar radiation falling directly on to an occupant will lead to an increase inthe mean radiant temperature experienced.

• High intensities of radiation from direct sun or even the diffused sky cancause discomfort glare, or disability glare where an occupant’s visualperformance will actually be impaired.

The function of shading is to eliminate these three effects.

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•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.

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USE OF SHADING DEVICESSolar controls should be considered for all glazed openings exposed to directsunlight. Solar control is particularly important on south to west-facingfacades, since the solar gains will coincide with the hottest part of the day.Solar control is also vital for lightweight buildings with large areas of glazing.

When sunlight hits a pane of glass, it splits into three components –

that which is reflected,

that which is absorbed and

that which is transmitted through.

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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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HORIZONTAL SHADING DEVICES - OVERHANGS

• These are placed horizontally in front of the window, in various ways.

• Their, shape, type, depth and height all differs, all depending on the sun conditions. A window overhang is a (usually) horizontal surface that juts out over a window to shade it from the sun. This is desirable in order to reduce glare or solar heat gain during warm seasons.

• In temperate climates, where there are warm and cool seasons due to the tilt of the earth's axis of rotation in relation to the plane of its orbit, it is often desirable to shade a window during hot summer months but to allow sunlight to shine through a window in the winter to help warm a building. Because the sun is higher in the sky in the summer than the winter, it is possible for a fixed overhang to accomplish both summer shading and winter sunlight admission.

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Types of exterior shading deviceTwo 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. Presentation By- Ar. Roopa Chikkalgi8

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Elevation of Shading DeviceSouth Facing Facades

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Internal Shading devices

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Other shading devicesBesides 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

Presentation By- Ar. Roopa Chikkalgi

SHADING FROM SURROUNDINGS

Buildings can provide useful shade on nearby structures.

A building may be designed with the best intentions but if

the buildings around are not kept in mind then, it might

become totally shaded and cold at certain times of the

day.

In the same way, trees and vegetation can be used to provide shade when it is beneficial.

Shading from buildings

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Shading from vegetation

• Vegetation is infact a powerful tool in shading, as well as in reducing solar radiation, wind and precipitation and trees planted well can save up to 30 percent of a building's total energy requirement.

• Trees and vegetation can be used to provide shade where it is seasonally beneficial. In hot places, plants and trees, planted in front of a window dos not only reduce solar radiation but the evaporation process also helps to cool the air.

• In winter, properly placed trees and shrubs shield your home from cold winds, reducing heat loss by 10 to 30 percent.

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