Brief- In architecture day-lighting plays an important role in designing - and how we can do it. about- ways- aspects- conclusion

1. RESENTATION
ON
DAYLIGHTING

2. INDEX:-
1.INTRODUCTION
1.1 WHAT IS DAYLIGHTING?
1.1.1 SOURCES OF DAYLIGHTING
1.2 METHODS OF DAYLIGHTING
1.3 WHY DAYLIGHTING?
1.4 ADVANTAGES AND DISADVANTAGES
2.MASSING FOR DAYLIGHTING
3.BASIC PRINCIPLES OF DAYLIGHTING
3.1 BUILDING ORIENTATION
3.2 FORM OF BUILDING
3.3 GLAZING RATIO
3.4 GLAZING SPECIFICATION
4.5 OVERHEAD DAYLIGHTING
3.5.1 SKYLIGTHS
3.5.2 CLERSTORIES
5.6 REDIRECTING LIGHT
4.COMPONENTS
5.IMPORTANCE IN SUSTAINABLE BUILDING
6.WAYS TO MAKE SUSTAINABLE DESIGN
7.TYPES OF TECHNOLOGY
8.ASSOCIATIONS AND ORGANIZATIONS
9.CONCLUSION

3. DAYLIGHTING IS THE PRACTICE OF PLACING WINDOWS, SKYLIGHTS, OTHER OPENINGS, AND
REFLECTIVE SURFACES SO THAT SUNLIGHT(DIRECT OR INDIRECT) CAN PROVIDE EFFECTIVE
INTERNAL LIGHTING. PARTICULAR ATTENTION IS GIVEN TO DAYLIGHTING WHILE DESIGNING A
BUILDING WHEN THE AIM IS TO MAXIMIZE VISUAL COMFORT OR TO REDUCE ENERGY USE.
ENERGY SAVINGS CAN BE ACHIEVED FROM THE REDUCED USE OF ARTIFICIAL (ELECTRIC)
LIGHTING OR FROM PASSIVE SOLAR HEATING.
SOURCES OF DAYLIGHTING:
• The primary source of light for daylighting is the sun.
• The light received by the earth from the sun consists of two parts:
• Direct solar illumination
• Design Methods
WHY DAYLIGHING?
1.Improved aesthetics
2.Good daylighting design is beneficial to health.
3.Daylighting to humans is important in that it is necessary for visual comfort and providing
psychological needs
4.Using natural light from the sun costs nothing to the environment but pays big dividends to
building occupants.
5.Reduce lighting costs. The overall objective of daylighting is to minimize the amount of
artificial light and reduce electricity costs.

4. Colour rendition
Occupant Satisfaction
Colour Temperature
Reduced electrical load
Time Orientation
Increased heat gains
Glare!
Functional interference
Increased cooling loads
ADVANTAGES-
DISADVANTAGE

5. MASSING FOR
DAYLIGHTING
• Massive for visual comfort.
• It can be very difficult to get
consistent daylight and control glare
from east and west windows.
• However, the side of the building
facing the sun's path (the equator-
facing side) can generally be easily
shaded with overhangs, light shelves,
or louvers, the side of the building
away from the sun's gets little or no
glare.
• Therefore, generally buildings that are
longer on their east-west axis are
better for daylighting and visual
comfort.
USEFUL DAYLIGHT (STRAIGHT
ARROWS) AND
UNWANTED GLARE (JAGGED
ARROWS) ON
DIFFERENT FACES OF A BUILDING.

6. • The orientation of buildings is important, if the length of
the
building is oriented in an east-west axis, it will allow
penetration of passive heating or cooling within the
building
on a seasonal basis).
• A north-south facade is better as it allows penetrating a
good daylight by avoiding glare and overheating.
• Designers could define which rooms need direct or
indirect
sunlight and require the quantity of heat or heat loss.
BUILDING ORIENTATION
BASIC PRINCIPLES OF
EFFECTIVE DAYLIGHT
DESIGN-

7. • Orient the majority of the glazing north-south, with a
maximum exposure to more easily controllable daylight.
• •South, is desirable because direct solar radiation
received by the south facade is easier to control to prevent
excess solar gain. Daylight is relatively uniform.
• •North light is the best for daylighting because it is not
direct and constant diffuse skylight. It is facade is
advantageous for uniform and soft daylighting.
• •Toward the east and west the sun is very low—almost
horizontal—so it is hard to control.
Orientation 1 is worst for
daylighting, 3 is good, and 2
is best.
BUILDING ORIENTATION
FORM OF BUILDING-
 Identifies the quality of daylight.
 Different shapes, thin linear, L shape, U-shape and doughnut need enough natural light through the
courtyard and thin building
 Courtyard and thin building, increase the natural light and heat distribution to the sides of building.

8.  Glazing provides natural daylight but also allows
unwanted summer solar gains and winter heat losses.
 The larger the windows the more daylight and solar gain will
enter - but the larger the heat losses will be.
 Recommended glazing ratios are generally between 25-50%
of the external wall of the daylight space
 The optimum glazing ratio may vary due to individual
factors such as orientation, location, obstructions (View of sky)
and activity/user requirements.
GLAZING RATIO-
GLAZING SPECIFICATIONS-
• The type of glazing has a direct influence on
thermal performance and daylight levels.
• Triple glazing gives greater thermal comfort
because its internal temperature is closer to the
internal air conditions.
• Triple glazing, tinted or reflective glass can
result in reduced daylight levels.
WINDOW
SPECIFICATION
DAYLIGHT
TRANSMISSIO
N
SOLAR
TRANSMISSION
SINGLE
GLAZING
88% 83%
DOUBLE
GLAZING
77-80% 65-70%
DOUBLE
GLAZINGTINTED
29% 39%
TRIPLE GLAZING 70% 40-60%

9. OVERHEAD DAY
LIGHTING
There are several top-lighting methods:
 Skylights
 Clerestories.
SKYLIGHTS-
Skylights are domed, horizontal or slightly
sloping glazed openings in the roof.
CLERESTORIES
• Clerestory windows are usually situated at a high level (near the ceiling of
the room) - always above eye level.
• They provide an effective source of natural light and ventilation whilst
reducing glare.

10. Redirecting light is the use of building elements to
bounce sunlight into more desirable locations in the
building.
Light shelves and baffles are two strategies that can
distribute light more evenly.
A light shelf avoiding glare
and pulling daylight deeper
into the room
Baffles in a roof monitor avoid
direct glare while bringing in the
sun's full brightness
REDIRECTING LIGHT-

11. COMPONENTS OF DAYLIGHTING-
A daylighting system consists of systems, technologies, and architecture.
While not all of these components are required for every daylighting system
or design, one or more of the following are typically present:
Daylight-optimized
building footprint
Climate-responsive
window-to-wall
area ratio
Solar shading
devices
High-performance
glazing
Daylighting-
optimized
fenestration design
WHY DAYLIGHTING IS
IMPORTANT FOR
SUSTAINABLE
BUILDING SOLUTIONS?
• One of the largest sources of energy use in a commercial building is
artificial lighting.
• Better ways to save energy that still keep the quality and the productivity of
the workplace at a high level. Natural daylighting is the answer.
• It is an important sustainable building solution, because it effectively
illuminates any area with no ongoing cost.

12. WAYS DAYLIGHT CAN MAKE DESIGN MORE
SUSTAINABLE
• Optimize urban design and building orientation.
• The perfect size, form and glazing treatment for windows.
• Shading for visual comfort and cooling.
• Work with bright interior surfaces.

13. WAYS DAYLIGHT CAN MAKE DESIGN
MORE SUSTAINABLE
• Move task areas close to windows.
• Consider daylight reflector systems.
• Energize your building with solar radiation.
TYPES OF
TECHNOLOGY-
Exterior shading
and control
devices
Aperture
location
Reflectances of
room surfaces
Integration with
electric lighting
controls
Glazing
materials

14. ASSOCIATIONS AND
ORGANIZATIONS
• Daylight Dividends is a multi-year joint research program of
the DOE and a variety of state energy agencies facilitating
the widespread implementation of daylight in buildings.
• Seventhwave provides information for daylighting guidance.
• ENERGY STAR, first established in 1991 as a voluntary
labelling program, helps both businesses and consumers
reduce costs and protect the environment through energy
efficient products and practices.
• International Commission on Illumination (CIE) The United
States National Committee CIE/(USA) is a not-for-profit
organization formed in 1913 to assist the International
Commission on Illumination in achieving its objectives in the
fields of light and lighting.
• Illuminating Engineering Society (IES) is an organization
whose mission is to advance knowledge and disseminate
information for the improvement of the lighted environment
for the benefit of society.
• Lighting Research Center (LRC) School of Architecture,
Rensselaer Polytechnic Institute, is the world's largest

15. CONCLUSION-
• In architectural design, natural daylight is a crucial
component in determining sustainable building and the
quality of an indoor environment.
• Many significant factors determine the quality and quantity
of daylight; site orientation, form of building and type, size,
location of the glazing space.
• The successful design of healthy building is controlling the
natural lighting and distribute in spaces according to their
needs.
• Using appropriate glazing specification for buildings can
result in reduce daylight levels and decrease in energy
use for artificial lighting.