Friday, June 20, 2008

Low-E Coatings

Low-E Coatings

Low-emittance (Low-E) coating are microscopically thin, virtually invisible, metal or metallic oxide layers deposited on a window or skylight glazing surface primarily to reduce the U-factor by suppressing radiative heat flow. The principal mechanism of heat transfer in multilayer glazing is thermal radiation from a warm pane of glass to a cooler pane. Coating a glass surface with a low-emittance material and facing that coating into the gap between the glass layers blocks a significant amount of this radiant heat transfer, thus lowering the total heat flow through the window. Low-E coatings are transparent to visible light. Different types of Low-E coatings have been designed to allow for high solar gain, moderate solar gain, or low solar gain.

Ref.: Window Technologies

2 comments:

Jean Vincent said...

Is it possible to apply low-E coatings on existing glass?

It would be very useful to improve existing glass thermal performance at a lower cost than replacing windows, especially large and thick storefront windows.

Ideally it would come in spray or paint.

Who are the manufacturers of these low-E coatings?

Thanks in advance.

Cwallpinoy said...

No, it can not be applied on existing glass surface either inside or outside as it can easyly be scratched. Low-E is applied to the surface no. 2 of IGU or laminated glass during manufacturing. There are a lot of manufacturers that can be found in the search option of this website.