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Bert

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Reply with quote  #11 
Greg

Have you started on your ZPDP yet?

I was wondering if a ZPDP would work for the 11 x 8 collector I'm planning to build. The reason it is appealing is that the intake and outtake will most likely be at the bottom.
The odd size of this makes me wonder about the airflow though.
What do you think?



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Bert K.
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gbwillson

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Reply with quote  #12 
Bert-

The ZPDP is partially built. Of should I say I have the polyiso box built. I have been kinda struggling with the intake and exhaust vents being so close together. The vents are 2.25" x 14" so even with them stacked upon each other it'a very tight fit. And with the collector being made of polyiso, I need some sort of reinforcement on that end of the panel. I don't want to use wood, and flashing is too wimpy so I've been looking for something better...

Greg in MN
Bert

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Reply with quote  #13 
What about the metal they make ductwork from. Would that work? Very sharp stuff though
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Bert K.
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mocars2

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Reply with quote  #14 
Greg-did you ever get past just building the polyiso box? Any luck finding a backing?
.
Bert

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Reply with quote  #15 
I was wondering about the backing as well. If I can't find anything better I might go with this;
https://www.menards.com/main/building-materials/panel-products/specialty-panels/hardwood-panels/1-4-c-3-white-birch-plywood-wood-veneer-core/p-1444441908486-c-13334.htm?tid=3347040374951506807

It's lighter than most of the stuff I've researched. It is wood though.

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Bert K.
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gbwillson

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Reply with quote  #16 
Mocars/Bert-

I haven't gone any farther on the ZPDP build for a few of reasons, namely that the sun at my location this time of year is really crappy so my motivation has been nil. While I could finish it up, there are so many trees in the way, I couldn't do any testing anyway. It's going to be a few weeks before the sun rises above the treeline. While it was mild in December, there was literally no sunny days. Be assured, I will have it done for some good solid testing. And since I already have a 4x8 2-screen up and running, I should be able to give some good test data for comparison.   

I have several choices for the backing material in order to keep the unit lightweight. Plywood is out as it's just too heavy and doesn't handle the elements well over time. Fiberglass paneling, which is thin, light and should handle the elements well, sheet aluminum, which I can get in either .032" or .040 thickness, and lastly leaving the back panel unprotected. I'm leaning towards unprotected at this point since this is a prototype. Once I know better what to expect performance-wise, I may build using a little beefier construction. As I have very limited space I will have to make some tough choices next year as I have pretty much run out of room for any more collectors. Although I could sell off older models and build newer ones. I've had several people ask me to build them a collector. [biggrin]

Greg in MN
mocars2

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Reply with quote  #17 
Coroplast is another back option - light, weather proof but not stiff though., but it might be with insulation behind it.
gbwillson

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Reply with quote  #18 
I thought about coroplast too, but you can't buy large sheet locally unless you buy large quantities. They are also more expensive than a sheet of twin wall polycarbonate. 

Greg
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Reply with quote  #19 
Chicago area Home depots has 48 in. x 96 in. x 0.157 in. White Corrugated coroplast  for $21.46
stmbtwle

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Reply with quote  #20 
Home depot now sells PVC sheet which would be a good substitute for plywood, but NOT any lighter nor as cheap. Might be good for framework though.

I use "Thermoply" from the home store for the backs, it's lightweight, cheap, and pretty durable, though it does need to be painted and the edges sealed.

Dont think it would beat coroplast, though.

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Willie, Tampa Bay
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