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Gaining Energy Savings Through Your Windows
  Window film has been used for decades to control solar heat gain through windows. By helping to reduce a building’s cooling load, window film decreases the amount of time that cooling equipment runs to maintain comfortable indoor temperatures. As a result, facility managers typically experience a level of energy savings somewhere between 5 and 20 percent, depending on the building’s glass type, window-to-wall ratio and cooling equipment, as well as the climate and type of window film used.
Conventional solar-control window films of the past, while providing valuable savings during cooling season, often have one big drawback: they reduce solar gain through windows all year long, even when heat gain might be desired in winter months.
Today’s high-performance, low-emissivity (low-e) window films improve upon the performance, appearance and durability of solar-control window film to offer something that conventional film can’t: improved savings and energy use year-round. Low-e window film typically offers better overall annual savings when compared to conventional film.
By improving window insulating power, the loss of free solar heat is offset during the winter months; as a result, this type of film usually provides commercial and institutional buildings with both cooling and heating savings. Low-e technology helps reduce the flow of radiant heat from the warmer side of a window to the cooler side. In summer, low-e window film reduces solar heat gain; in the winter months, it reduces heat loss. Year-round savings is one of the factors that sets this type of window film apart from conventional films of the past.
How low-e works
Because objects within a building are typically warmer than surrounding outdoor temperatures, the objects in a space radiate heat toward cooler temperatures. If heat attempts to radiate to the outdoors when a low-e film is applied to the interior side of a window, the low-e film reflects much of it back into the room instead of absorbing the radiant heat & subsequently radiating this heat outdoors.
The percentage of heat reflected back into the room (and how much radiant heat is absorbed and lost to the outdoors) determines the window film’s emissivity rating. The lower the emissivity of the window film, the more improved the heat-flow reduction is through a window during winter and summer.
High-performance, low-e window film helps transform existing windows into energy-efficient windows by improving insulating power. After installation, single-pane windows can offer the same annual insulating performance as double-pane windows; double-pane windows can offer the annual insulating performance of triple-pane.
Newer low-e films are also designed to be spectrally selective. They reduce solar near-infrared heat while still allowing visible light to pass through, allowing more exposure to daylight for occupants.
By: Steve DeBusk, Eastman Chemical Company/Vista Window Films | Jan 16, 2015
Article Source:http://www.ifma.org/publications/blog-fmj/article/blog-fmj/2015/01/16/gaining-energy-savings-through-your-windows
On reaching the age of 35, we start losing approximately 7,000 brain cells each day — cells that will never be replaced.
The brain is about 2% of the total body weight, but uses 20% of the body’s oxygen and calories.
People who ride on roller coasters have a higher chance of getting a blood clot in the brain.
The brain changes shape during puberty.
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