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Archdemon

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Reply with quote  #31 
What about a baffle in the middle while still sticking to the 3 layers? Would be easier for me to have the inlet and outlet at the same location for flows and drilling [tongue]

[twin-solar-air-collector] 

Something like that but still sticking to the layers from the ZP design, rounded corners and extra pushfans running of the solarpanels but mainly kicking in when reaching X temp?

Archdemon

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Posts: 25
Reply with quote  #32 
Or maybe you call em fins?
gbwillson

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Reply with quote  #33 
People have made collectors, including a ZP-type design in a down and back configuration. It could also be done over/under, where there is a dividing sheet of metal flashing with the ZP portion on the top of the metal. This would make more sense with your long and narrow build. Most of the down and back collectors(sometimes called double-pass) are more square, such as 8'x8'. It would also help if you keep with the deep 200mm build. The return end of a doublepass adds a LOT of resistance. You are asking the air, often at a high velocity, to do a 180˚ turn. So the more open and free flowing, the better. The rule of thumb is to have the return end TWICE the size of the main cross section to reduce the resistance. Rounding the corners will help smooth the flow too. The dividing surface needs to be short enough to make this happen. 

Greg in MN
Archdemon

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Reply with quote  #34 

Cant picture in my head what this means:

"It could also be done over/under, where there is a dividing sheet of metal flashing with the ZP portion on the top of the metal. This would make more sense with your long and narrow build."

Or how it would be done [tongue]

gbwillson

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Reply with quote  #35 
Yeah...........that was written when I was half asleep.


I have this test unit about half built, not sure if i'll be able to get back to it anytime soon, since I'm just starting to build my newest ZP. 

Greg in MN

http://simplysolar.supporttopics.com/post/zpdp-7740121?pid=1289399842
Archdemon

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Posts: 25
Reply with quote  #36 
What are the fins made out of and how would you place em?
This looks like what i had in mind first, but not sure would you put the screen directly on the absorber instead of space it like 3.5cm?

I like the recycling potential in that design tho.
However youd end up with hotpocks at the end where the curved thing is.

Have you dont any developments or changes to this since you posted it the first time?
Archdemon

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Posts: 25
Reply with quote  #37 
Been lookin alot in this thread.
https://simplysolar.supporttopics.com/post/don-cs-new-2x16-zeropass-collector-8071547?&trail=10

Might just follow that and work around the problem and ignore the baffle entirely.
gbwillson

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Reply with quote  #38 
The "fins" are made from aluminum flashing bent to a 90˚ angle. I was planning to use pop-rivets to attach them to the bottom of the divider plate. I was thinking the bottom screen should lay directly upon the divider to better "scrub" the heat off the divider surface and break up the laminar flow a bit. I think if you were to go with three layers, the bottom layer could certainly be placed there. As far as screen layer spacing, at the time I had not done my screen spacing test. So a wider screen gap looks to perform better. I don't know if I would have three screens, spaced 3.5CM apart, but then again, I never test three layers of screen. 

http://simplysolar.supporttopics.com/post/zeropass-screen-gap-testing-8443382?&trail=10

Greg in MN
Archdemon

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Posts: 25
Reply with quote  #39 
What bout the absplate? A alumesh or a solid plate?

Its from that thread i figured that i should go with a gap of 3.1-3.5cm
gbwillson

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Reply with quote  #40 
Well, it should be metal, preferably aluminum and solid. If you use a mesh, the air will simply take the shortest path to the exit. Dan tried this using screen only and found the return got very hot from lack of airflow and that the bulk of the air never stayed between the screen layers. Now you COULD lay the alumesh on top of the divider plate instead of screen to break up the laminar flow, but it's a lot more expensive than screen.

Greg in MN
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