Bio-fuels - Introduction
View more presentations from Ritu Kesarwani.
Saturday, November 14, 2009
Friday, September 11, 2009
Quick TIPS on energy saving: Daylight
What is Day Lighting?
Day lighting is the controlled admission of natural light into a space through windows to reduce or eliminate the need for electric lighting. Today’s highly energy-efficient windows, as well as advances in lighting design and technology, allow efficient use of windows to reduce the need for artificial lighting during daylight hours without causing heating or cooling problems.
Why Use Day Lighting?
Day lighting has been shown to save from $0.05 to $0.20 per square foot annually. The energy savings from reduced electric lighting through the use of day lighting strategies can directly reduce building cooling energy usage an additional 10 to 20 percent. buildings can lead to annual savings of 35-60% on lighting energy.
The U.S. Department of Energy estimates that electronically tintable window systems are capable of providing up to:
40% savings on energy bills
20% savings on operating costs
24% reduction in peak demand
25% decrease in the size of HVAC systems
Who Uses Day Lighting?
Hotels and resorts, offices, residential apartments, hospital and nursing home, art galleries, museum, libraries, religious facilities, aviation facilities, high-tech or image buildings, atriums and overhead daylight openings.
In the summer, day lighting keeps your house cooler as the heat is kept outside. In winter, the heat from objects that are heated by either sunlight or inside heat sources is bounced back into the home, a process which keeps the entire home warmer.
Where and When to Use Day Lighting?
Solar powered smart window, because of their low DC voltage and power consumption, and the obvious complementary relationship between the amount of sunlight available and the level of tinting required to modulate it.
Pluses: Energy saving, increased user productivity, reduced emission, reduction in cooling up to 32 % annually and heating loads up to 39%, reduced fading due to UV rays, reduce escaped or wasted energy, block glare.
Minuses: The cost of electrochromic windows can be from 2 to 3 times that of a standard window. These costs are expected to decrease significantly when manufacturing techniques have improved and quantities have increased. Liquid crystal glazing adds about $90 per square foot to the glazing. Electrochromic films require an electrical hookup that is not required for other types of solar-control window films and therefore requires unconventional wiring at windows and may require coordination of electrical and carpentry trades.
References
Whole Building Design Guide
New York Real Estate Journal
Sage Electrochromics, Inc.
Efficient Windows Collaborative
Day lighting is the controlled admission of natural light into a space through windows to reduce or eliminate the need for electric lighting. Today’s highly energy-efficient windows, as well as advances in lighting design and technology, allow efficient use of windows to reduce the need for artificial lighting during daylight hours without causing heating or cooling problems.
Why Use Day Lighting?
Day lighting has been shown to save from $0.05 to $0.20 per square foot annually. The energy savings from reduced electric lighting through the use of day lighting strategies can directly reduce building cooling energy usage an additional 10 to 20 percent. buildings can lead to annual savings of 35-60% on lighting energy.
The U.S. Department of Energy estimates that electronically tintable window systems are capable of providing up to:
40% savings on energy bills
20% savings on operating costs
24% reduction in peak demand
25% decrease in the size of HVAC systems
Who Uses Day Lighting?
Hotels and resorts, offices, residential apartments, hospital and nursing home, art galleries, museum, libraries, religious facilities, aviation facilities, high-tech or image buildings, atriums and overhead daylight openings.
In the summer, day lighting keeps your house cooler as the heat is kept outside. In winter, the heat from objects that are heated by either sunlight or inside heat sources is bounced back into the home, a process which keeps the entire home warmer.
Where and When to Use Day Lighting?
Solar powered smart window, because of their low DC voltage and power consumption, and the obvious complementary relationship between the amount of sunlight available and the level of tinting required to modulate it.
Pluses: Energy saving, increased user productivity, reduced emission, reduction in cooling up to 32 % annually and heating loads up to 39%, reduced fading due to UV rays, reduce escaped or wasted energy, block glare.
Minuses: The cost of electrochromic windows can be from 2 to 3 times that of a standard window. These costs are expected to decrease significantly when manufacturing techniques have improved and quantities have increased. Liquid crystal glazing adds about $90 per square foot to the glazing. Electrochromic films require an electrical hookup that is not required for other types of solar-control window films and therefore requires unconventional wiring at windows and may require coordination of electrical and carpentry trades.
References
Whole Building Design Guide
New York Real Estate Journal
Sage Electrochromics, Inc.
Efficient Windows Collaborative
Let's know what Skylight can do in energy saving.
What is Skylighting?
Skylights is another method often used for day lighting by placing horizontal windows, tube or domes at the roof of buildings. Typically an opening required for skylights to illuminate an area is very less its just 5% of total area. Skylights illuminate more space as compares to vertical windows and distribute the light more evenly in the space.
Why use Skylighting
Skylights and roof windows admit 30% to 50% more light than vertical windows in dormers. A skylight can add daylight and warmth to a room in winter and fresh air in summer. An energy-efficient, properly designed skylight admits enough light for the room and save energy cost by reducing heating and cooling loads. Heat loss in winter and gain in summer due to skylights are negligible as area used for sky lighting is very small.
Some comparison data:
One square meter of horizontal roofing using a polycarbonate panel (transmittance 0.5) provides during the 70% brightest hour per year more light that 7 T8 (36 W Fluorescent tubes in luminaries) in Northern Europe and 15 in Southern Europe.
One square meter of horizontal roofing using a polycarbonate panel (transmittance 0.5) provides during the 70% brightest hour per year more light that 6 T8 (36 W Fluorescent tubes in luminaries) in Northern Europe and 13 in Southern Europe.
Who Uses Skylighting?
Hotels resorts, offices, residential apartments, schools, gymnasium, art galleries, museum, libraries, religious facilities, airport, production buildings e.g. warehouses or garages.
Where and When to Use Skylighting?
Window skylights are suitable for lighting the space where big area roof is available for installation of window. Tubular skylights are useful where space available for opening are too small for a traditional skylight or places windows can not be placed such as bathrooms, dressing rooms, corridors, staircases, attic or basements. The light tunnel may also be used at night, after installing a light kit.
Pluses: Enhanced user’s comfort and electricity savings, less likely to cause UV damage to carpets or furniture. Lesser suffering from Seasonal Affective Disorder (SAD) when there is plentiful daylight, . Tubular skylights reduce absolute heat loss and heat gain because of their small cross-sectional area.
Minuses: Poorly constructed or installed skylights may have leak problems and single-paned ones may weep with condensation. Heat loss in winter and heat gain in summer.
References
Velux Canada Inc
Hometips.com
Solatube International
Skylight
Skylights is another method often used for day lighting by placing horizontal windows, tube or domes at the roof of buildings. Typically an opening required for skylights to illuminate an area is very less its just 5% of total area. Skylights illuminate more space as compares to vertical windows and distribute the light more evenly in the space.
Why use Skylighting
Skylights and roof windows admit 30% to 50% more light than vertical windows in dormers. A skylight can add daylight and warmth to a room in winter and fresh air in summer. An energy-efficient, properly designed skylight admits enough light for the room and save energy cost by reducing heating and cooling loads. Heat loss in winter and gain in summer due to skylights are negligible as area used for sky lighting is very small.
Some comparison data:
One square meter of horizontal roofing using a polycarbonate panel (transmittance 0.5) provides during the 70% brightest hour per year more light that 7 T8 (36 W Fluorescent tubes in luminaries) in Northern Europe and 15 in Southern Europe.
One square meter of horizontal roofing using a polycarbonate panel (transmittance 0.5) provides during the 70% brightest hour per year more light that 6 T8 (36 W Fluorescent tubes in luminaries) in Northern Europe and 13 in Southern Europe.
Who Uses Skylighting?
Hotels resorts, offices, residential apartments, schools, gymnasium, art galleries, museum, libraries, religious facilities, airport, production buildings e.g. warehouses or garages.
Where and When to Use Skylighting?
Window skylights are suitable for lighting the space where big area roof is available for installation of window. Tubular skylights are useful where space available for opening are too small for a traditional skylight or places windows can not be placed such as bathrooms, dressing rooms, corridors, staircases, attic or basements. The light tunnel may also be used at night, after installing a light kit.
Pluses: Enhanced user’s comfort and electricity savings, less likely to cause UV damage to carpets or furniture. Lesser suffering from Seasonal Affective Disorder (SAD) when there is plentiful daylight, . Tubular skylights reduce absolute heat loss and heat gain because of their small cross-sectional area.
Minuses: Poorly constructed or installed skylights may have leak problems and single-paned ones may weep with condensation. Heat loss in winter and heat gain in summer.
References
Velux Canada Inc
Hometips.com
Solatube International
Skylight
Magic Of White-Roofs
Everybody is aware with the fact that darker materials absorb more heat from sun than white/light colors, but an interesting data I want to share that black surface in the sun can be 40°C (70°F) hotter than the reflective white surface. This phenomenon occurs in the case of roofs also and heated roof then transfer their heat to surrounded air and contribute to heat island effect, while reflective metallic/ ceramic roof can reflect 65-75 %solar light. According to California energy commissioner “White roofs can cut a building’s energy use by 20% and save consumers money,” and “The potential energy savings in the U.S. is in excess of $1 billion annually.”
White roofs need not necessarily can be achieved by huge investments on metallic roof or ceramic tiles, the flavour of white roof can be realized by inexpensive methods like painting roof with white acrylic paint, titanium dioxide coating or even with limestone talc (In India commly known as choona), and one can have flexibilty by having roof covered with tarpauline sheet in summer or on demand.
White roofs need not necessarily can be achieved by huge investments on metallic roof or ceramic tiles, the flavour of white roof can be realized by inexpensive methods like painting roof with white acrylic paint, titanium dioxide coating or even with limestone talc (In India commly known as choona), and one can have flexibilty by having roof covered with tarpauline sheet in summer or on demand.
Subscribe to:
Posts (Atom)
