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Sustainable Lighting Strategies. Cathedral of Christ the Light. Specialization in Environmental Architecture 1: Green Design. Energy Use. In homes and offices from 20 to 50 percent of total energy consumed is due to lighting. Lighting accounts for 20 percent of all electrical energy usage. - PowerPoint PPT Presentation
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Sustainable Lighting Strategies
Specialization in Environmental Architecture 1: Green Design
Cathedral of Christ the Light
Energy Use• In homes and offices from 20 to 50 percent of
total energy consumed is due to lighting.• Lighting accounts for 20 percent of all electrical
energy usage.• Lighting accounts for about five to ten percent
of total energy use
Sustainable Lighting• The approach to sustainable energy use is a two
pronged:1. Energy Conservation2. Energy Efficiency
It can be described as minimizing energy consumption and carbon emissions while still maintaining suitable illumination on an economically satisfactory basis.
Daylighting
Daylighting In Architecture
• Is the practice of placing windows or other openings and reflective surfaces so that during the day natural light provides effective internal lighting.
• Most simply, daylighting is the practice of using natural light to illuminate building spaces.
Barcelona Museum of Contemporary Art (Architect: Richard Meier)
Natural Lighting Benefits
• Reduced energy consumption.• Reduction of mildew or mold
built-up.• Healthy dose of vitamin D.• Improved performance due to
change in working environment.• Increased visual appeal in
interiors.
Kimball Art Museum
The Pantheon
Daylighting Strategies• Sidelightingis a daylighting strategy that uses apertures located in the wall planes as the point of admission for ambient daylight.
• Toplightingis a daylighting strategy that uses apertures located at the roof plane as the point of admission for ambient daylight.
Strategies and Tools
3 ways to improve the amount of light available from a window.• Place window close to a light
colored wall.• Slant the sides of window
openings so the inner opening is larger than the outer opening.
• Use a large light colored window sill to project light into the room.
• Daylighting Windows / Clerestories
Strategies and Tools• Light Shelves
An effective way to enhance the lighting from windows on the equator-facing side of a structure.
The light shelf projects beyond the shadow created by the eave and reflects sunlight upward to illuminate the ceiling.
12” minimum width
Are used to more evenly distribute daylight entering a building through sidelighting apertures
Strategies and Tools
• Skylightis any horizontal window, roof lantern or oculus, placed at the roof of the building, often used for daylighting.• The optimal area of skylights varies according to
climate, latitude, and the characteristics of the skylight.
• It is usually 4-8% of floor area.• Spacing of skylights are usually equal to the ceiling
height.
Reichstag
Strategies and Tools
• Light Tube
Also called a solar tube, solar pipes, light pipes.A devices consisting of a lens that isinstalled on the roof, an adjustable mirror-lined tube (10- 20” diameter)It is placed into a roof and admits light to a focused area of the interior.
Strategies and Tools• The Thinner the Building, the Better.
Maximize ceiling and window height to gain better light distribution
Separate Daylighting and View Windows.
Bring Daylight in from above to obtain deeper penetration into space.
Strategies and Tools
• Maximize North and South Faces• Minimize East and West Faces
A southern facing orientation is optimal if a building or system is located in the northern hemisphere, and a northern facing orientation is optimal if located in the southern hemisphere.
Strategies and Tools
• Reduce the surface area of GlassToo much glass could end up with heat-gain and heat-loss problems, and glare issues.
Filter and shade daylight to avoid direct sun and sky light
Strategies and Tools
• Open up the Plan• Limit Private Rooms /
Spaces
Strategies and Tools
• Pick Light Colors with High Reflectance Coefficient
Bounce daylight off surrounding surfaces to diffuse light in more even patterns
Artificial Lighting
Assessing a Sustainable Lighting Program
1. Lighting Technology• Lamps• Fittings and Luminaires
Fluorescent TubeCompact Fluorescent Lamp LED Lamp
Assessing a Sustainable Lighting Program
2. Lighting Design• Colors of Wall and Ceiling• Lighting Layout• Lighting Control
• Avoiding incandescent lights, using CFLs or light-emitting diode.• The color of the walls, ceilings and furnishings should be kept light
so that it reflects more light to the workspace areas.• Reducing the general illumination level by employing task lighting.• Using dimming or step ballasts for energy savings when full light
level is not required.• Matching the amount and quality of light to the function to be
performed.• Switching lighting for perimeter zones to be separate from interior
zones.• Energy consumption can also be reduced through sophisticated
lighting control systems.• Specifying higher efficiency light sources to produce more light
with lower energy consumption.• Consider solar powered lighting.
Efficient Lighting Design Approaches
Assessing a Sustainable Lighting Program3. Practices: Organizational BehaviorIt is essential to engage with and educate users on the need for the change and the benefits of sustainable lighting systems.
• Educating and training of users to gain commitment to the lighting project.• Automatic shutdown of lights after 6 or 7 pm, beyond which local task lights can be
used.• Negotiating cleaning contracts for day time, so that all lights can be switched off
after office hours.• Reinvigorating any existing campaigns supporting good practices in lighting.• Integrating sustainable lighting strategies into the company’s procurement policies
and practices.• Switching to green power to meet an organization’s energy needs.• Offsetting lowered emissions through carbon credits and other alternative
arrangements.
References
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