Shading devices ppt

introduction to shading devices, types of shading devices deatiled explanation, uses of shading devices, solar radiation, configuration, design process of shading devices, shadow angle, building examples.

1. CLIMATOLOGY RAR-309 SHADING DEVICES Submitted To : Submitted By : Ar. Saima Raza Aanchal Mahika Smriti Prince Amit Firoz

2. SHADING DEVICES Shading devices are equipments that are used externally and internally or in between the building spaces to protect from direct sunlight. The main objective behind using shading devices is to create comfortable internal environment. It has been proved that shading devices could improve building energy performance, prevent glare, increase useful daylight activity and create sense of security.

3. USE OF SHADING DEVICES To reduce heat gain during summer, reduce the cooling loads and therefore minimizing the costs. Improving internal environment for greater comfort. Some shading devices improve the internal and external aesthetics of building. Realizing these potential benefits, a varied of shading configuration have been invented and put into the market, such as manual, fixed, internal and external shading device. Therefore it is essential to use shading devices.

4. SOLAR RADIATION When sunlight hits a pane of a glass, it splits into three components- Reflected - no effect on heating. Absorbed- glass heats up which would transfer heat by conduction and also emits heat. Transmitted- heat up the surface behind it .

5. CONSTRAINTS : Sun path and wind direction are usually are usually different. Maintenance of air flow through the non air conditioned buildings during the cooler hours of the day. There is a need for admitting controlled levels of diffused air light. In most of the cases there will be the requirement of views out of the window.

6. TYPES OF SHADING DEVICES INTERNAL EXTERNAL

7. INTERNAL SHADING DEVICES Limit the glare resulting from solar radiation. Usually are adjustable and allow occupants to regulate the amount of direct sunlight entering their space. Internal shading can be provided using curtain, blinds, louvered shutters etc. Internal shading devices should be made or designed to be durable.

8. CURTAINS VERTICAL LOUVER BLINDS BLACKOUT BLINDS

9. EXTERNAL SHADING DEVICES External shading device is primary used to control sunlight penetration to the interior of the building. Most thermally efficient as it controls the amount of radiation entering the building externally. The three main types of external shading devices are: HORIZONTAL VERTICAL EGG-CRATE

10. Horizontal shading Vertical shading Egg-crate shading

11. HORIZONTAL SHADING DEVICE Horizontal Shading Devices are usually in the form of canopies, long verandas, movable horizontal louver blades or roof overhangs. They are best suited to southern and northern elevations and their performance is measured by the vertical shadow angle (epsilon).

12. Basic Typology of Horizontal Shading Devices for Southern Exposures

13. SHADING ISSUES FOR EAST AND WEST FACADE

14. HORIZONTAL SHADING DEVICE- OVERHANGS These are placed horizontally in front of the window. Their shape, type, depth and height all differs, depending upon the sun condition. A window overhung is usually a horizontal surface that juts out over the window to shade it from the sun. This is desirable in order to reduce glare or solar heat gain during warm season.

15. VERTICAL SHADING DEVICE Vertical Shading Devices consist of pilasters, louvre blades or projecting fins in 45" a vertical position. Their performance is measured by the horizontal shadow angle (delta ). They are commonly referred to as fins and are most effective on western and eastern elevation.

16. SHADING DEVICES FOR NON SOUTHERN EXPOSURE

17. Vertical fin strategy for on north facade

18. CONFIGURATION OF NON SOUTH FACING FACADE For reasons of both heat avoidance and economy, it is often best to “gang” the south facing shading devices. 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.

19. BASIC SHADING STRATEGY FOR SOUTH ELEVATION

20. EGG-CRATE SHADING DEVICE They are combinations of vertical and horizontal devices. They are usually in the form of grill blocks or decorative screens. Their performance is determined by both the horizontal and vertical shadow angles and ( delta and epsilon).

21. EGG-CRATE SHADING DEVICE

22. SHADING THROUGH VEGETATION Shading needs to be provided in the way of landscaping and foliage.  Deciduous trees are effective as they block the sun in the summer when it is not desired and allow sun penetration during the winter . The natural environment can be used to shade low rise buildings . Deciduous trees can effectively shade the facade when heat avoidance is desired, and permit solar penetration where passive solar gain is sought. 

23. VEGETATIVE SHADING

24. DESIGN OF SHADING DEVICE STEP ONE It is necessary to determine when shading is required, that is at what times of the year and during what hours of the day. This is usually done by defining the overheated and underheated periods. STEP TWO The position of the sun at the times when shading is required must be established. This is usually done with the aid of a sun-path diagram.

25. STEP THREE The dimensions and proportions of the shading device that will provide shading during the period earlier defined is found. This is done with the aid of a shadow a ngle protractor. STEP FOUR The choice of prefabricated devices or the design of new ones. The design of shading devices takes not only the require.d geometry into consideration but also aesthetic and structural factors.

26. VERTICAL AND HORIZONTAL SHADING DEVICES Shading devices should be selected according to the orientation of window. Vertical shading devices is most effective when sun is to one side of elevation and at low angle, such as eastern or western elevation . Horizontal shading devices is most effective when sun is opposite to the building façade considered at an high angle, such as north or south facing walls.

27. HORIZONTAL SHADOW ANGLE The Horizontal S hadow A ngle (HSA) is required for vertical shading devices. HAS=wall azimuth - solar azimuth

28. VERTICAL SHADOW ANGLE The Vertical S hadow A ngle (VSA) is required for horizontal shading devices. It is the angle between ground line and altitude of sun.

29. BUILDING EXAMPLES EGG-CRATE SHADING DEVICE VERTICAL SHADING

30. CONCEPT OF SHADING USED IN EXTERIOR FACADE

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