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Scott Davis

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Suntuf is light, very easy to work with (cuts easily with tin snips and drills easily too), tolerates high heat, is strong to the elements, inexpensive (about $20 for a 8 foot X 26 inch piece), UV protected and readily available at most Home Depots.  Tuftex is carried at Lowes and is similar.  If your local Home Depot doesn't have Suntuf in stock, ask them where the closest store is that has Suntuf 8' X 26" clear roofing panel.  The SKU number they'll want is 282688.  If their answer is too far to drive, ask them to order it for you.  Most Home Depots are happy to without any additional charge.

You'll also need screws and wiggle strips.  Those you can order on line yourself from the Home Depot web site if you like.  Here are the links to everything you'll need:

The Glazing (clear, 8' X 26" panel):
http://www.homedepot.com/h_d1/N-5yc1vZ1xh7/R-100021329/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053

The Screws:
http://www.homedepot.com/h_d1/N-5yc1vZ1xmv/R-100095071/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053

And the Wiggle Strips:
http://www.homedepot.com/h_d1/N-5yc1vZ1xh7/R-100078282/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053


Other Glazing Options:

Suntuf is a great option for glazing, but it is by no means the only one.  Here is a great list with pros and cons of many glazing options:

http://www.builditsolar.com/Projects/SpaceHeating/Glazing.htm

 


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charliea1001

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To get the most efficiency out of a heater I'd like to enclose the absorber with double glazing... but not glass. Has anyone had any experience building double glazing units with plexiglas?
Plastic moves a lot with temperature changes and I'm a bit concerned this movement breaking the seal between the two panels. At the moment I'm planning on using wooden spacers between the panels and Henry 900 as the sealant. Advice and comments would certainly be appreciated.
rmonteb

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Question :  How long can we expect to last when painted black?

The Mfg. warrents pex for 60 days when exposed to UV rays.   So how long will pex last when painted black?  Does the black paint block the UV rays?

Scott have you seen any damage to your pex pipe?  Did you install it in 2008?


Monte
Kennewick, WA

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Monte Benham

PS. Scott my new email address is:

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I can't update it on this site because I forgot my password
Scott Davis

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Hi Monte,

Not only does the black paint protect the pex or CPVC, so does the the UV protected SunTuf (from Home Depot) or Tuftex (from Lowes) glazing.  The pex in my collector looks the same as the day I installed it.

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netttech

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Reply with quote  #5 
Quote:
Originally Posted by charliea1001
To get the most efficiency out of a heater I'd like to enclose the absorber with double glazing... but not glass. Has anyone had any experience building double glazing units with plexiglas?
Plastic moves a lot with temperature changes and I'm a bit concerned this movement breaking the seal between the two panels. At the moment I'm planning on using wooden spacers between the panels and Henry 900 as the sealant. Advice and comments would certainly be appreciated.
solardan1959

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The previous thread fron charliea1001 has been posted several times with no response, hopefully with more people on the site some ideas might pop up.
  My thoughts to their question is both sheets of plexiglass would be expanding and contracting even though the outer one might be a little more.  But since the both would be expanding and contracting about the same and in the same way it would not really make much of a difference?
  Then I wonder if sealing it would be a great idea unless you could be sure to get any moisture out.  The Twin wall polycarbonate I buy is open on the ends and the instructions want you to leave "weep holes" for moisture to get out.  At the same time, if somebody was to seal the bottom with silicone sealant, then heated the panel so the air expanded, then ran a bead of sealant while it was still warm, do you think it would have a higher R value as an evacuated plate.  An example of 6mm twin wall poly here:
http://www.menards.com/main/building-materials/roofing-soffits-gutters/specialty-roofing/multilite-6mm-twinwall-clear/p-1485866.htm
Dan



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Reply with quote  #7 
Hi, Dan

Reckon that THIS would be OK ?

http://www.theplasticpeople.co.uk/double-glazing-kits-c-157_79.html

it is acrylic.

SO, if GLASS is out, why not just use 2 sheets of acrylic ?

G_H

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solardan1959

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Reply with quote  #8 
Hermit,
   I have no problem with glass or anything people want to use though I'm not at the bubble wrap stage yet.  Those kits are interesting options, a little expensive, but okay if you have some drafty windows or even just want to cut down on heat loss. My wife used to be in the habit of leaving a window open all the time all year for fresh air. It took almost a year in Upstate New York for her to get out of that habit: For the UK people something like this is what I prefer: http://www.ebay.com/itm/Polycarbonate-Sheet-Greenhouse-and-Roofing-Twinwall-4mm-6mm-10mm-Glazing-Sheet-/320838580198
or this: http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=360314085207
or this for you: http://cgi.ebay.fr/Plaque-alveolaire-epaisseur-6mm-Plaques-polycarbonate-/111001366113

  I think my Glass collectors, (Solar Web Page > Forums > Member Projects! > SolarDan's projects) look the best, but they are very heavy and have an unknown level of UV blocking. Also glas is hard to cut to size. 
Dan
Garage_Hermit

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Reply with quote  #9 
Hmmm...

I had a wild idea - I wonder if anybody is using THIS stuff...

http://www.ronsautoglassmn.com/used-auto-glass.html

I know from experience that sun on a rear windscreen can get pretty wicked hot !
No doubt due to the curves...
That's why its illegal to leave kids unattended in cars...
(or police dogs, for example...)

I reckon that quarterlights and side windows -- which are generally pretty flat -- could be assembled together to go in a matrix, and make a pretty hefty piece of glazing material !
Even if the joins need some imaginative bodging (cement or power tape)...
It might make for a pretty crazy-looking collector face, but who's bothered if the neighbours didn't mind or it's round the back of your barn etc.

Could you just imagine a collector face make of SIX Mack truck windshields, all nicely cemented together, with five layers of mesh tagged in behind... Beaming onto a solid block of magnesium holding 3 gallons of water and fitted with a supercharging pump "borrowed" off of a submarine...

Or imagine meeting somebody who wants to get rid of the hard-to-dispose of windows from a fleet of derelict CITY BUSES... http://www.westberga.se/

Gives the word "glazing" quite another dimension, so to speak...

One could even make a "three-dimensional cuboid" collector, glazed on all sides, that way it would work from nine till five (!) as the sun tracked all the way around it !  Install a big copper tank at the focal point and make superheated steam, could even be a self-propelled collector in that case, using a steam generator and a turbine...

Or how about a geodesic half-dome, made up of assembled triangular quarter lights off a fleet of old Toyotas  ? ha ha !  Now I'm getting carried away !

Then no doubt one day, somebody would put together The World Database of Autoglass Allsort Shapes, contains specifications for all of these various shapes and sizes of auto glass windows, and somebody else would write a program, to fit them all together to make various projects, such as The Cincinatti Giant Parabolic Project, or the Colchester Collector, as big as a football field, and assembled on a flexible pneumatic jig resembling a gigantic inflatable fuel bladder...

Such monsters could be connected up to city subway piping systems, and pump free heat to thousands of homes, like the neighbourhood heating they have in Paris...

Tomorrow's motor cars would be designed so that their windows could be recycled into solar collectors, ten years down the line....

That's a lot of glass...

Well, sorry, that's the end of my blast , I reckon that Scott is off to have to invent a new Forum for this one!

G_H



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billdad

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Reply with quote  #10 
Charliea,
Double glazed glass has some inert gas (nitrogen I think) between them to displace moisture. I would leave a small hole at each end of the sandwich and ask a buddy with a MIG welder to squirt some argon or co2 gas in one hole and out the other.

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