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gbwillson

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Reply with quote  #11 
Mocars-

That's exactly what it is. The hinges are the self-closing type normally used on heavier, or fire doors and cost about $10-12 a pair. These have adjustable tension too. Even the weakest setting is enough to put a sting on a finger if you aren't careful. The screen would be attached to the framing at the end away from the tensioners. The other end of the screen would have a fold or loop. This is similar to roll down window shades. A stiff rod or metal bar would be inserted into the fold attached to the tensioners so the screen is pulled tight. Craig ended up putting the idea on hold for now due to the fact that the tensioners(spring hinges) needed be able to raise and lower with any changes with the screen gap. Once we figure the optimal screen gap, then the tensioner hinges will be used. This method works very well, and we  both like it better than using frames to hold the screens. The "pin" I think you are talking about is simply a bolt to prevent the hinge from snapping fingers or smashing into the glazing. Ouch!

Greg in MN


mocars2

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Reply with quote  #12 
Greg - interesting concept he's come up with..
So he didn't use your frameless idea - did you ever post that yet?
gbwillson

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Reply with quote  #13 
Mocars-

Actually, my idea for the frameless screens was to use a row of small springs to pull a bar or rod that adds tension to the screens. But when I told him about my idea, he thought of the using torsion springs. But he couldn't find any springs long or skinny enough. But a couple of days later, he had a pair of the adjustable tension spring hinges which happen to be torsion springs inside. Brilliant! So while the original concept might be mine, I like his solution much better. 

No, never set up the frameless idea. I planned to use them on the ZPDP but I ran into a couple of problems. I ran out of room to mount them next to my 2-screen. Where they would have been mounted there isn't a time of day that both collectors would be in full sun and that was very late in the day. And being that the box I built out of polyiso has no frame, I don't really have a good place to mount any springs or hinges without tearing the collector apart. Hopefully this spring, just after I take all collectors down for the season I can set everything up one day to compare the ZPDP against the 2-screen. 


Greg in MN
gbwillson

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Reply with quote  #14 
Latest photo from the new ZP. He's almost done...


Greg posting for Craig in MN

ZP painted and almost ready.jpg 



mranum

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Reply with quote  #15 
Looks awesome!
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gbwillson

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Reply with quote  #16 
The top is done. The top frame is made from welded aluminum angles for the outside, and some cross pieces for both stability and to help hold down the glazing. The twin wall glazing was both attached and sealed to the aluminum frame with 3M industrial foam tape. The tape is about ½mm thick and is designed to hold objects that weigh 30 pounds. It is extremely sticky! There are polycarbonate H-pieces between 4' sections. The weatherstripping is attached to the underside of the cover and the cover will be held down by bolts passing through the cover, through the frame and into the stand. Essentially, this is now a ONE PIECE "cover"! Below is the underside of the cover before turning it over and attaching it to the collector.

Greg posting for Krautman Craig in MN

IMG_0935.jpg 





KevinH

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Reply with quote  #17 
RE "the cover will be held down by bolts passing through the cover, through the frame and into the stand."  Does that mean the bolts are going all the way through the 6" thickness of the collector plus the thickness of the stand?

Kevin H
MN
gbwillson

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Reply with quote  #18 
Kevin-

Yes, but only half the bolts will be long enough to attach the collector to the stand. The bolts will pass through the cover, the hollow collector frame, and out the back side of the collector.

Greg
gbwillson

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Reply with quote  #19 
Mocars-

Sorry I missed your question.

The screen tensioner will not be used at this point. It works, but having the tensioner function with the adjustable screen gaps was making things too complicated. It uses adjustable spring hinges. The spring hinges would be attached to a bar or rod attached to the end of the screen. Even on the weakest setting, the hinge is quite difficult to pull open, so a stop was put in to keep the hinge from smashing into the glazing. 

Greg in MN
gbwillson

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Reply with quote  #20 
Update:

Krautman's new ZP is now mounted on the testing stand so only a few items remain before testing can begin. He's still working on the spacers. Temporary clamps will be used to hold the cover in place and allow for easy removal during testing and adjustment. Today he began working on the fan that will be used. It uses pulleys, so in order to slow things down a bit from the current flow of 1500CFM, the fan pulley will be increased in diameter. He wants the fan to put out about 1000CFM before it is attached to the collector! Just a note, the stand is on wheels, so with 1000CFM you can use your imagination if things went awry...[wink]


Greg in MN
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