What are External Movable Shading Systems
External Movable Shading Systems are installed on the windows and glass facade of buildings which dynamically control the solar heat ingress and the visual light transmission. Controlling the solar heat ingress has a significant impact on the cooling/HVAC load of the buildings. Sophesticated systems also provide natural day-light control.
Why External Shading instead of Internal Shading
The Solar Heat Gain Coeffiecient (SHGC) of internal blinds is more than 40% while that of a external shading system is less than 12%. The diagrams below demonstrate the reason for this low SHGC and the significance of external shading systems.
|Internal Blinds||External Blinds|
|As the shading system is behind the glass pane, the heat enters the building and the Solar Heat Gain Coefficient (SHGC) is more than 40%||As the shading prevents a significant proportion of heat from entering the building, the SHGC can be reduced to less than 12%|
Types of External Movable Shading Systems
Disclaimer: The motive of provide examples of movable shadings systems is to give the participant an idea about existing systems. This is not an exhaustive but instead an indicative list. The participant is recommended to use this only as a reference. The design competition promotes innovative, indigenous, India-specific designs.
1) Simple Systems which provide only Shading
1.1) Wooden Shutters
1.2) Roller Blinds
1.4) Fabric Blinds
2) Systems with Shading and Day-light control
2.1) Horizontal Lamela Blinds
2.2) Vertical Lamela Blinds
3) Example of Buildings in India with External Movable Shading Systems