Re: energy-efficient windows

[Bernard Cleyet <anngeorg@PACBELL.NET>]

In Sweden I watched my host clean the windows.  She unlatched and
separated the panes mounted in WOOD.  Of course, everything in Sweden is
made of wood, but I suspect the improvement using wood over Al is more
than a third pane.

bc

Brian Whatcott wrote:

> A popular history with some slight relevance:
>
> Once incandescent lamps were vacuum filled.
> Then a nitrogen back fill increased life by reducing filament sputter.
> But more energy was convected / conducted to the envelope.
> Coiled coils helped conserve heating effect.
>
> Then an argon, or better, a krypton fill was introduced,
> to reduce heating of the envelope.
>
> If envelope temperatures were not so high, it's possible that a plastic
> jacket would conserve more energy inside. This might be the basis of
> the e-coatings, possibly?
>
> Musings on triple-glaze.
> If double glazing reduced aperture loss by 50%, then another double glaze
> would arguably reduce it another 50%, an aggregate of 75% reduction.
> But if the break even period were 7 years for double, then for two double
> glazes, it's conceivable the payback period would be  21 years.
> That's too long.
>
> Brian W

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