[GBlist] dual pane glass for 450f?

["Y & L" <ylimahl@hotmail.com>]

Does anyone have an idea...

By how much would the spacing between 2 panes have to be adjusted for 
temperatures between 300f and 450f

if  a) air
and b) argon  between sheets?


Dear listmembers
>
>A few years ago there was an discussion regarding glazing
>
>"Each gas has an "optimal" cavity spacing,
>(approx. air 12.7mm, argon  9.52mm and for krypton  6.35mm)
>beyond which the primary heat
>transfer mechanism switches from conduction to convection. However,  the
>TOTAL R-value remains constant beyond the "optimal" spacing, as the
>increased heat losses from convection are offset by decreased heat losses
>from conduction. "
>
>I presume the above was for double glazing only?
>What is the situation with extra clear (low iron) glass and/or low
>emmissitivite coated glass?
>
>What is the situation with triple glazing ? For example some data from
>manufacturers where the spacing increases :
>
>Triple glazed krypton gas filled, low e coat on suface 2 et 5 calculated
>DIN 52619 (German standard)
>4/8/4/8/4 mm      0.7 W/m2K u value
>4/10/4/10/4 mm   0.6 W/m2K u value
>4/12/4/12/4 mm   0.5 W/m2K u value
>
>Are there any detailed technical papers on this subject available via the
>internet?
>





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