glass used in passive design
Last Post 22 Jan 2015 05:15 PM by Oberon. 5 Replies.
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gosolarUser is Offline
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21 Jan 2015 08:17 AM
I have project in central FL where a screened in lanai is going to be converted to an enclosed room with 3 glass walls opening into home like added room, the current opening having a 9' slider into the space will be removed.

it is 12 x 20 by 90" tall     the 20' wall is facing south.

It appears that the easiest window size to get is about 48" wide, so if I used a fixed glass above an awning window of 24" in height I can make up the window walls, I have wood on top and sides to screw into and concrete on the floor, was thinking of using a pressure treated 2 by on the concrete as an attachment base.

I read that glazing can be for example Low-e 366 all around,
then I read the east and west sides should have glass with a lower heat gain.

since this is Fl I'll be using double glazing.






Dana1User is Offline
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21 Jan 2015 01:49 PM
In a central FL location try to eliminate east & west facing glass altogether, since the summertime gains are gia-normous! With that much south facing glass even reflected solar gains are going to be significant, even if you have sufficient roof overhang to avoid direct mid-day gain.

If no glass (or minimal glass) on the east & west sides are not an option, plan on installing operable exterior heat rejecting shades (Coolaroo, et al). It may be worth treating at least some of the south facing glass that way too. Even in winter the direct gains of that much glass are going to turn it into a sauna on sunny days, but that might feel pretty good on the few days when it's actually cold.

Air sealing the room will also be critical to keeping the latent loads in the house down, and insulating the roof to R38 would also be important for reducing gains/losses from this now-conditioned space.
gosolarUser is Offline
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21 Jan 2015 02:34 PM
You know I forgot about the attic space above!

good point
JellyUser is Offline
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21 Jan 2015 02:39 PM
agree with Dana - all that east/west glass would make it a good place to install a rotisserie and start roasting chickens.
gosolarUser is Offline
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21 Jan 2015 03:13 PM
Well the two 12' e/w sides must be glass, so the question remains what type other than low=e 366
OberonUser is Offline
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22 Jan 2015 05:15 PM
LoE³-366 is made by Cardinal Glass. Cardinal supplies well over half of all residential coated glass used in North America.

They have a new product that they have recently introduced called LoE³-340 and while 366 is actually a pretty good solar heat control LowE coating, 340 is better.

By comparison 366 has a SHGC of .27 wile 340 has an SHGC of .18. You probably arent going to find glass anywhere with a lower SHGC, at least nothing that you can actually see thru.

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