Re: double glazing both sheets of glass low e2
Oct 16, 2012 11:54 am
In my 25 years of experience I've never heard of both sheets being Low-e. Hard coating Low-e shouldn't be used on the face 2 of double glazed units, except for a fridge or cellar door. Low-e only prevents hear from going out not from coming in.
Re: double glazing both sheets of glass low e3
Oct 16, 2012 1:31 pm
Has anyone heard of double glazing with both sheets of glass low-e?
Its been specified in some plans?
I'm guessing they want no heat gain through the glass?
The principle is that low-E glass is a one way solution... if you number the glass surfaces from the outside, 1, 2, 3, 4, then in a heating climate we place the active surface of Low-E on surface 3, where it keeps the heat inside the home and in a cooling climate on surface 2 where it keeps the heat outside the home. In my opinion, there is a small difference in U value for low-E between heat entering and leaving, wherever the low-E is placed, and in Europe low-E has 2 U-values for that purpose. But if we suppose that low-E stops 80% of the radiant heat, then adding an extra pane will only work on the 20% remaining radiant heat, so I think that would not be very economical. It may be that the energy rater is simply trying everything to get the rating across the line...
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Re: double glazing both sheets of glass low e4
Oct 18, 2012 8:05 pm
Some excellent info.
I checked with the architect and he confirmed that is what he specified.
It really didn't have anything to do with me and he was in little mood to chat.
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