[Greenbuilding] Glass overhead doors for passive solar application?

[Keith Winston]

Nope. I've had long conversations with Thermotech. The best glass they 
have available is the Superglass I spoke of.

But it's good that I'm not life-committed, since with Superglass I 
remember a quote for their windows that was OUT OF THIS WORLD expensive: 
they were something like $3000 for a single window, if I recall. They 
quoted a 10x increased glass price for Superglass (this didn't reflect 
what other manufacturers were adding, and it pi$$ed me off).

I liked the Cockney accent.

Actually, when I  look at Thermotech's website, the best pure glass 
numbers they have are about R-8, and the best full-window performance is 
U=.17, nearly an R-6. That's VERY VERY good performance for a window. It 
is not, however, an R-17.

Keith


Rob Tom wrote:
> On Mon, 04 Dec 2006 23:36:20 -0500, Keith Winston 
> <keith at earthsunenergy.com> wrote:
>
>> Uh, an R-17 window? I don't think you'll find that.
>>
>> The very best glass I know of is Superglass 88 or whatever it's called,
>> which has a center-of-glass value of about R-10.
> [snip]
>>
>> If you find an R-17 window, I'll use it in every single
>> project from now on, I promise you!
>
>
> Keith;
>
> Uh oh.
>
> I think that you may have just committed yourself to buying Thermotech 
> windows
>                http://www.thermotechwindows.com
> for the rest of your life, assuming that you are a man who honours his 
> promises.
>
> Years ago, rumour had it that those wascawy wabbits at Thermotech, 
> just for the fun of it, made a window that outperformed an R-20 stud 
> wall. (Yes, with glass in it and through which one could see through.)
>
> So, I hope that you are located in the Northeast portion of the USA 
> rather than some bizarre place like California (so as to keep shipping 
> costs & transportation energy at a minimum).
>
> But I agree.
> Overhead sectional glass doors as a window wall ?
> Nifty maybe, but energy-efficient ?
> [acquiring a Cockney accent a la Monty Python gang]  Nought blowdy 
> loikly !
>
> ===* ===
> Rob Tom
> Kanata, Ontario, Canada
> <archilogic at chaffyahoo dot ca>
> winnow the chaff from my edress in your reply
>
>
>
>

-- 
Keith Winston
Earth Sun Energy Systems
3927 Madison St.
Hyattsville, MD 20781
301-980-6325
keith at earthsunenergy.com
www.EarthSunEnergy.com