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victordaniels

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Posts: 17
Reply with quote  #1 
I got this window and am going to turn it into a solar panel. It is 58"x82".



window.jpg 


In order to reduce weight I'm only going to use one sheet of glass. The hybrid nature is that the two layers of screen extend the full length of the panel into the plenums. I'm hoping this will gather more heat, and also limit the amount of incoming air from hitting the glazing.


design.jpg 


The polyiso sheet is attached to the bottom of the window frame. 






gbwillson

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Reply with quote  #2 
Victor-

Nice find on the old window. Is this layout using metal studs? It looks a bit tight inside, especially the distance of the top screen in relation to the glass glazing. Twinwall has a better R-value than glass. Such close proximity of the air to the cold glazing would reduce output temps. And with the smaller collector box, the operating temps may require you to reduce the fan output as the air has less time to warm up. Reduced fan flow from low output temps will allow more air to move outside of the screen gap, reducing efficiency. 

I like the screen layers extending into the manifolds. I had screens in my manifolds up until I needed to get my hands inside to fix something, so I ended up tearing them out. Might want to remove the screen closest to the intake. Technically, it would no longer be a ZP, since air has to pass through screens, decreasing airflow. Consider doubling up the upper screen. This would allow free airflow, while still increasing screen transfer area. 

Greg in MN
victordaniels

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Posts: 17
Reply with quote  #3 
I was originally planning a down and back panel, but due to restrictions on where I can put the in and out vents here's the plan now:

plans.jpg 

I'm wondering about the placement of the ducts. I have them centered in their channel, but I wonder if I should put the in duct at the bottom of the box and the out at the top. Maybe that would make the air flow over more of the box. I've got two frames of screen that fill the entire box. The top is a double screen and the bottom a single. 

I also found this blade for cutting foam:

blade.jpg 

victordaniels

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Posts: 17
Reply with quote  #4 
Here it is glazing down. The dividers are polyiso covered in foil tape glued to the glazing with silicone. The screens go in next with polyiso strips as dividers between them. The bad thing about using this frame is that I have no side to slide things into. It will all have to be glued together and unassemblable.

frame.jpg 

stmbtwle

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Reply with quote  #5 
Nice setup Victor,

I've wondered if a "layer cake" design (similar to yours) would work. The bottom layer being the back and ductwork, each screen and its frame a layer, and the glazing a layer. Spacer layers could be used to adjust screen gaps. The whole thing would be held together with long screws or bolts.

One could add or remove layers at will. No I haven't built one; just a thought.

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
victordaniels

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Posts: 17
Reply with quote  #6 
This is a cake layer design. I am going to silicone the whole thing together. I don't think screws will hold in polyiso, and I need a way to make the walls in the channels airtight.
stmbtwle

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Reply with quote  #7 
It will be interesting to see how it works out.

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
gbwillson

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Reply with quote  #8 
Looking good Victor-

One small suggestion is to increase the area at each turn as these are areas of considerable drag. Consider making the turns 40-50% larger than the area of the main flow for improved airflow. So if the main flow is 12" wide, make each turn 18" wide.

Greg in MN
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