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Scott Davis

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Reply with quote  #11 
Hi Jeff,

Neat design!  I like the combination of backpass and screen combination.  It seems there is an extra opportunity to pick up heat on the way down!

It would be nice to be able to test how your W pattern would compare to the standard, straight, two layers of screen.  I tested something similar here.  It was a quick test and double checking is required for certainty, but the performance appeared about the same, but with a higher pressure drop for the W pattern.

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solardan1959

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Reply with quote  #12 
Jeff,
   It was not for sale, it was a large commercial unit in the entranceway/shopping cart storage area.  I'll take a photo next time I'm in there.  I was wondering how it might work on a smaller scale.  I really want to get into water but I am leary about putting something in the house that might make it harder to sell in a couple of years, primarily a huge homemade water tank.  I did find some interesting components at this site:http://www.nlsolarheating.com/  I really like the heat exchanger for a forced air system at about 200 dollars, (attached).  I also think an evacuated tube system might work in my climate better.
Sorry getting of track here but the heater reminded me of your water collecter.  I'l move any more of this conversation to the water section and cc you when I put it there.
Dan

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jpeg 1248903896Air-to-Water-Heat-Exchanger-for-Solar-Hot-Water-Systems_T.jpg (47.61 KB, 720 views)

netttech

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Reply with quote  #13 
My storage tank is made of wood, with metal frame to support it. It can be taken apart/removed if new owners wouldn't want it.

My son helped me install the parabolic panel tonight. After a clean-up of my work space I'll start building the new panel. I'm on vacation for the next two days & may a good start by tuesday.

Jeff
Central IL.
Buffalobillpatrick

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Reply with quote  #14 
Very interesting design ideas! Thanks a bunch. I'm in planning stage. I have room for 200ft2 of TAP on new house.
I have bought a commercial grade Cincinnati fan that will move 510 CFM against .25" water column back pressure.
Do these backpass TAP work without backdraft dampers, due to thermal trap of cold nightime air?

BBP
solardan1959

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Reply with quote  #15 
Buffalo Bill,
   Yes, The cold air pools at the bottom so you do not get reverse flow like a normal TAP with the vent at the top and bottom.
Dan
Buffalobillpatrick

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Reply with quote  #16 
Thanks Dan, great info here.
I'm a retired computer engineer, hardware/microcode, but barely able to use my home computers. Lucky my son is a Mac geek who owns 2 repair shops.
I have always wanted to make use of solar.

Edit: adding a question:
Material for back seperator that the air goes down behind before going up the front of collector.
Does it need to be a thin insulator like 1/2" polyiso foam or can it be something cheaper that don't insulate?

see:
http://davidmdelaney.com/larkin/larkin-tap-1.html
Scott Davis

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Reply with quote  #17 
Hi Buffalo Bill,

Actually, I think in that design it is better if it doesn't insulate so that there is additional surface area for the air to pick up heat.  The only place you want insulation is on the back wall (and that is unnecessary if you build to attach to the side of your home).

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Buffalobillpatrick

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Reply with quote  #18 
Thanks Scott, really appreciate your info & videos.
solardan1959

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Reply with quote  #19 
I've made my own drawing of a couple of screen collectors as it seems like it is not that clear to some people lately.  I've just had several people lately where it seemed like they were unclear about the roles of the screen  so I am putting these drawings out.  In one case the person ended up with a backpass behind his fabric.  The good thing is he is getting good heat and is happy but by following this design it may have worked better.  In Scott's earlier screen drawing I think he is depicting the vent going through the screen but it is not clear.  Some people may not actually go through the screen but, in my opinion, I feel it's best.  No offense is meant, it is your collector, but sometime we may not have explained ourselves enough or make too many assumptions on what others know.  Enough rambling, here is my drawing.
Dan

Scott Davis

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Reply with quote  #20 
Thanks for the drawings Dan!  You might want to clarify for folks that the sun is to the left (on the side of the blue arrows).
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