Low-E Glass(Low Emission Glass)
The amount of human activity happening indoors, in homes and offices, is very high. Maintaining optimal temperature indoors promotes both healthy living and healthy working. And, there is nothing better if this can be done in a sustainable and energy-efficient manner. This is where Low-E Glass has come to play such an important role.
How does it work?
Sunlight or solar radiation consists of visible light, longwave (or ultraviolet) and shortwave (infrared) radiation. Low-E glass reflects back or reduces both types of radiation while allowing visible light to pass through. It also works in reverse. Indoor objects like furniture and people give off varying amounts of heat; since Low-E glass reflects heat back to it’s source, this heat is preserved within the room.
Using Low-E glass
* Low-E glass comes in high, moderate and low gain panels. High solar gain panels are great for colder climates where there is a need for heat to be preserved and reflected back into the building. Low solar gain panels reflect excess heat back into space making them ideal for hot climates. Moderate gain panels are a good fit for areas with temperature fluctuations. These panels are manufactured by applying a Low-E coating to the exterior (to keep heat out) or the interior (to keep heat in).
* High gain panels are also recommended for north and east facing windows where a larger amount of heat loss is to be expected. South and west facing windows work well with low gain panels especially during summer when there is a possibility of overheating.
Benefits of Low-E glass
* Low-E glass helps conserve heat during winter and dissipates heat during summer, leading to lower energy consumption for heating or cooling. You save on energy bills too!
* Low-E glass provides better fading protection as well. Your furniture, carpets, curtains and wall furnishings preserve their colour for longer.
* The energy savings from installing Low-E glass considerably outweigh the energy consumed while manufacturing the glass, thus providing benefits for the larger environment as well.
* Hard Coating (or Pyrolytic coating): Tin oxide and other additives are deposited directly onto the glass’s surface while it is still hot resulting in a hard and durable glass.
* Soft Coating (or Sputter or Vacuum coating): This coating is applied in multiple layers of optically transparent silver sandwiched between layers of metal oxide in a vacuum chamber resulting in a high-performing glass.
* Low-E films fulfill most of the functions of Low-E glass and are cheaper but much less durable.
Since the introduction of Low-E technology in 1979, the technology has evolved to the point where Low-E has now become part of mainstream construction.