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Energy efficient glass for windows - the smarter choiceBy Smitha Jose
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Windows of a building not only virtually connect us to the outer world but hold within them immense capacity to add to the aesthetic appeal of the building. Of late, we, with our inquisitive mind, have adorned them with yet another quality- of being energy efficient.
Since we are trying to mend our ways and trying to live more energy efficiently ( and sustainably), here are some facts you might be interested to know about this supercool variant of glass to bring about that efficient change.
So, what are energy efficient glass?
Windows are essentially the doors for the light and heat to come in- the two forms of energy that are crucial for our existence, when received in limits. But, when these energies are transmitted across the windows against our will, we resort to artificial sources (like a heater in the cold winter and an air conditioner in the summer) to bring them to the level comfortable for us. Energy efficient windows are used to reduce the dependence on such energy guzzlers and live more efficiently.
These glasses, commonly known as low e- glasses are coated with invisibly thin metal or metallic oxides that reduce their emissivity (hence increasing their insulating performance). These low e- glasses are manufactured in a way that controls the passage of heat across the window keeping in mind, the climate of the place and the light requirement of the house.
These low e-glasses are generally used in an insulated glass unit (IGU) or double/ triple glazing setting where in two or three glasses form the window with vacuum or dry air filling the gaps between them.
How to choose the correct low e glass for your window ?
Before choosing the low e- glass for your window, you should be familiar with the terms given below, which form the basis for energy performance rating credited on them.
U factor- this represents the heat conduction capacity of the glass i.e, how much heat loss it allows. The lower the U factor, the more energy efficient the glass is in retaining the heat within the room.
Solar heat gain coefficient (SHGC)- This is the fraction of heat radiation that is allowed through the window, both directly and indirectly which is eventually released as heat in the room. A low e-glass with high SHGC is more effective in collecting and admitting the solar radiation, keeping the room warm in winter. Likewise, a product with low SHGC is better for homes in hotter regions as it transmits low solar heat, keeping the room cooler.
Visible Light Transmittance (VLT)- As the name suggests, it’s the fraction of visible light that is allowed in by the glazed window/glass. It is expressed in the range of 0 to 1. The VLT needed for the glass depends on the daylight requirement of the house. Higher the VLT or VT, greater is the amount of light entering your rooms.
Light -to-Solar-Gain (LSG)- This rating tells about the efficiency of the glazed/coated glass in transmitting the visible light while blocking the excessive heat gain/loss. Simply put, LSG is the ratio between the VLT and SHGC of a glass. The higher the number, the higher is the window’s capacity to let in visible light blocking excessive heat radiation.
The chart here will make it clearer.
Types of Low e glasses
Depending on the manufacturing process, low e glasses are mainly classified into two categories.
Hard coating or passive low e- coating- The process involved is called pyrolytic process in which the thin layer of coating is done on the glass while it is still being made on the float line. The coat gets fastened or fused to the hot glass and makes a durable and strong hard coat.
These are preferred for houses in cold region where the heat gain and retention is required.
Soft coating or solar control low e-coating
Soft coating, unlike the hard one is done on a pre -cut glass with a process called MSVD. This type of low e-glasses with low emissivity and superior solar control is preferred to the hard coat ones for houses in hot regions where excessive heat and light gain is to be blocked.
With Glasxperts, the job of choosing the right energy efficient glasses is easier. The product cum design consultant inspects the building and its location to decide on the right amount of light and heat required and gets you the most suitable glass that will surprise you with its aesthetic look too.
Hope these tiny bits were of some help to you if you are planning to make that transformation from normal windows to energy efficient ones. Pride yourself that you are doing something substantial for both your house and the nature.
Looking for a Energy efficiency glass solution provider? Glasxperts are the best in India – Click here to Request a call back from Glasxperts
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