matlocc
1420920295
Posted 1510859597
Reply with quote #1
I have been reading about the trouble with air contacting the glazing. Could you put your screen inside and then stretch a screen across the top and staple it tight and then place your glazing on with say a 1/4 inch gap between it and the top screen. Actually you would have 3 layers of screen. It would be glazing, 1/4 inch down screen, then the inside of the box with your two layer screen and frame.
gbwillson
1352981942
Posted 1510869856
Reply with quote #2
I'm not sure what you mean about trouble with air contacting glazing. I've never heard of this.
SolarInterested
1352940256
Posted 1510875243
Reply with quote #3
Greg I believe it's about heat loss through the glazing when hot air is allowed to flow along the glazing.
matlocc
1420920295
Posted 1510921477
Reply with quote #4
It is about heat loss through the glazing. I was thinking more about this and instead of screen the window plastic may be a better idea. It is like making the glazing a double pane window. Glazing, airspace then the clear plastic. then the interior of the box. I will try to draw something and post a pic. I am not sure how to do the drawing stuff!!!!
SolarInterested
1352940256
Posted 1510923068
Reply with quote #5
Quote:
Originally Posted by matlocc
gbwillson
1352981942
Posted 1510931215
Reply with quote #6
Sounds like you want to replace the top-most screen layer with clear plastic. I would think screen would do a far better job of transferring heat to the air.
matlocc
1420920295
Posted 1510935564
Reply with quote #7
let's see if this works
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SolarInterested
1352940256
Posted 1510938369
Reply with quote #8
As far as the screens go it looks like the original double screen collector. The window plastic would add an extra 'pane' to the glazing and even if it bulged and partially touched the outer glazing it should still provide some benefit.
http://www.builditsolar.com/Experimental/AirColTesting/ScreenCollector/Building.htm
stmbtwle
1388591029
Posted 1511004868
Reply with quote #9
The window plastic should do a better job of keeping the air off the glazing, but it would add another reflective surface, too. Whether it would be a net gain or loss is a matter for testing.
gbwillson
1352981942
Posted 1511017977
Reply with quote #10
A single layer of glazing is fine in all but the coldest climates. Designs such as the downspout, backpass, and ZP, keep the air passing through a collector away from the glazing better than others.
