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Straw_Cat

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Reply with quote  #11 

Double glazing, as touched on by charliea1001:

One possible, though expensive, option for double glazing would be these 4' x 8' Multiwall Hurricane panels, made of clear lexan plastic:

 

http://www.homedepot.com/webapp/wcs/stores/servlet/ProductDisplay?productId=202482761&storeId=10051&langId=-1&catalogId=10053&MERCH=REC-_-product-5-_-100021329-_-202482761-_-N#.USloFPIvl2M



solardan1959

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Reply with quote  #12 
Ouch!  expensive but cool.  I wonder how stiff it is as opposed to normal twinwall.  Never have liked the flex I get but do not think I could justify the price.  I do like it better than Hermit's used car glass "solar city heating dome monsters" though city wide free heat is an excellent goal.
Dan
gdn1947

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Reply with quote  #13 
I have some "blown" household double glazing units. I'm not clear in my mind whether it would be beneficial or detrimental to have two layers of glass in the collector. Having failed, there is just an air gap between the glass. And the weight is a downside of course. Any thoughts appreciated
solardan1959

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Reply with quote  #14 
gdn1947,
   Two thoughts,
   I have tried to dry one out with some sucess, though it it did mist up in the corners for a while it finally cleared.  If you need the insulation that may be better. (the insulation more than makes up for the extra loss through the second layer of glass)
  Or you can seperate them into two sheets of glass and build two collectors.

In colder areas the insulatation does pay off and you'll produce slightly more BTUs than single pane glazing. But even in those climates the single glazing will work very well and produce lots of heat. (and be lighter)
Dan
gdn1947

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Reply with quote  #15 
OK Dan, thanks for your reply. The plan is to build and use the collector in France. Not to keen to try and split the unit down into separate panes of glass as the inherent strength will be lost
Garage_Hermit

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Reply with quote  #16 
Rigid PVC Film here...

Plastic Film, Mylar, Mylar Film - Grafix Plastics
http://www.grafixplastics.com/offcuts.asp

another view from a different source:
[000054_transparent_Main_Produit]

G_H

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(1)  "Heat goes from hot to cold, there is no directional bias"
(2) It's wrote, "voilà" unless talking musical instruments...
Garage_Hermit

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Reply with quote  #17 
Twinwall corrugated polycarbonate here...
http://www.ameriluxinternational.com/about_horticultural.php


Polycarbonate alvéolaire ondulé 
1/4-inch thickness (6 mm)
100-percent UV-resistant
Edges welded closed
Light transmissivity stated as 80% in clear version, and 68% for opaline version

G_H
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Garage_Hermit

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Reply with quote  #18 
PVC strip doors here...

Lamelle PVC souple transp. 200x2mm  det.

great for a garage door collector [wink]


PVC Strip Curtains here...

http://pvcstripcurtains.com/pvc-strip-curtains-installation/




[flexible-pvc-strips]


The above -- when combined with THIS...    http://www.solarcontracts.co.uk/products/2/12/decor-360-compact-roller-blind


decor 360 Compact Roller Blind
would make a KILLER Garage-Door Collector !

Must Remind Myself to Try This Design Out...  [cool]

G_H
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(1)  "Heat goes from hot to cold, there is no directional bias"
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netttech

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Reply with quote  #19 
I'm creating a picture comparison post on the General discussion page about twinwall &/or single layer plexiglass. Personally, I think it depends on your budget & the climate in your area.

Jeff
Central IL
Garage_Hermit

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Reply with quote  #20 
Plastic tablecloth material HERE...

Résultat de recherche d'images pour "transparent plastic tablecloth"

"Uses include":
Quote:

  • table covers,
  • storm windows and doors,
  • crafts,
  • insulation,
  • wind and vapor barriers,
  • car and boat windows,
  • sheeting,
  • tarps,
  • upholstery,
  • slipcovers,
  • barriers in walkin cooler and freezers, and...
  • all types of covers.

Quote:
Resists cold and hot temperatures, water, stains, and more.



I checked this stuff out at my local hardware store, they do light gage and heavy gage, the light gage is 0.1 mm thick (= 3.937 mil)  and the heavy gage is 0.2 mm thick (= 7.87 mil).

I bought a sample of the latter and will now test it on my... Garage_Door.  It costs the equivalent of 5 USD for 15 square feet.

G_H

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(1)  "Heat goes from hot to cold, there is no directional bias"
(2) It's wrote, "voilà" unless talking musical instruments...
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