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ChrisJ

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Posts: 95
Reply with quote  #1 
I have 4- 36" door panels that are narrow line from Anderson and want to use them for a 12'w X 7'h collector.

I have read comments that it may not work so good because of the low-e coating.

I thought that temperature affected how much "heat" gets through. My south facing double hung windows allow heat through to warm the rooms in the winter.

ChrisJ 


Thor

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Reply with quote  #2 
They will work fine... just not as efficient as "non low-e"... plus the cost is right.
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stmbtwle

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Reply with quote  #3 
Go for it!  It would take a lot of heat to pay for Low-E glass.  There is more than one way to look at "efficiency".



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solardan1959

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Reply with quote  #4 
Not to mention they look great and will stand up to the weather better, and does not need any additional support to keep from flexing.  I have used several old patio doors and large double pane windows and get great heat out of them.
On the down side they are very heavy so you won't want to be hanging them very high on a wall.
Dan
ChrisJ

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Reply with quote  #5 
I'm planning to build a shed, like a greenhouse. South facing, 60 degree angle roof, 12ft wide by 7ft high, with a knee wall like Solardan's greenhouse.

It's going right next to the house where my mechanical room is. Will be a drainback. Most likely copper pipe but I am considering a CPVC.

ChrisJ
solardan1959

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Reply with quote  #6 
Chris,
  I wish I would have had the glass for a project like that.  For one you can see out which the twin wall I used is basically opaque.  The other thing I did wrong was not build a solid enough wall.  While your only doing 12 feet and it will be easier to keep it solid, my 24 foot length using a 2X4 frame was not rigid enough.  What I plan to do is remove the glazing and rafters and  put a 2x6 or 8 plate on top of it to stiffen up the wall.  The main problem for me was I did not fix the top of the rafters directly to the wall but rather had a short rafter coming out then the angle rafter going down.  This lack of rigidity in the rafters, allowed some minor sagging with a snow load and a slight bowing out of the wall in the middle.
  If somebody had a higher wall to add the greenhouse to, Tied it right into the rafters which would have been the best way for me, or built a fixed rafter rather than what I did, it would have been more rigid and the wall may have been okay.  I would still build a stiffer top plate on the wall.
  Another thing I am thinking about is a vent all the way across the top, maybe a smaller frame that I can open along the top above the glazing to let the heat out in the summer.
  Still, it has been great in the cooler weather.
Dan
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