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solardan1959

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Reply with quote  #11 
Silverback,
   Not working at a bigger scale, 2 8X8 collectors is a lot of collector.  I current have three 4X8 with a 8 inch input and output.I think for each 4X8 you should use at least a 6" pipe for an input and another 6" for an output.  At a minimum for two 8X8 collectors you need an 8 inch input and output but I would recommend using 8" for each 8X8.  This can be overcome with a strong enough fan.

In my case the corrugated pipe is just for the input which will never exceed 75 degrees.  Not sure what you mean about pressure drops but if not overheated I can't see it collapsing very easy as it's meant to drive over with some dirt over it.  With Scott's the foam does not matter as the pipe is water tight though I guess a lot of water intrusion around the pipe may cool things down.
Dan

Scott Davis

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Reply with quote  #12 

Hi Silverback,

Hopefully pictures are worth a thousand words.  Here is how I built my underground duct: 

http://www.simplysolar.supporttopics.com/post/underground-outdoor-hot-air-duct-6527646?pid=1279548637#post1279548637

Scott

 

 


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Silverback

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Reply with quote  #13 
Solardan - From your pics I thought your collectors were 12'. Last spring I was able to run my modular 8'x8' with a 300cfm fan through 4" pipes with temps maxing out in the high 120's.  Thinking about your suggestion, increasing the ducts to 6" or 8" should allow me to run the 8x8's in series and keep the run to my basement a single i/o set like Scott's, but with the addition of a second fan (which I have). You've sold me on the corrugated tubing for input. Given that my ground can be pretty wet, I was worried about moisture cooling the buried tubes, but Scott's pics reminded me of the unused tarp in my garage. I've got a plan! 

This is starting to look like a few weekends of work. Glad I didn't take on the solar hot water this fall also.

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solardan1959

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Reply with quote  #14 
Silverback,
   In case you missed this on the other post, an easier, better alternative for about the same price.
http://simplysolar.supporttopics.com/post/show_single_post?pid=1279561691&postcount=7

Dan
Silverback

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Reply with quote  #15 
Nice find.

Imagine my surprise when I took my panels out of storage to find I had 6" and not 4" inputs/outputs on my 8'x8'.

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