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Bruce

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Reply with quote  #1 
I am in the planning and material acquisition stage of building a 6x12 zero pass air system.  I have seen some discussion about shade cloth as an alternative to screen, but every one I have seen suggests testing, but I have yet to see any results of such tests.  I am considering using the black shade cloth from HD as the back screen material. The more recent reviews of this material seems to imply that it is thinner than it used to be and provides better airflow.  I think it is reasonably priced.   

https://www.homedepot.com/p/Easy-Gardener-6-ft-x-20-ft-Heavy-Black-Sun-Screen-Shade-Cloth-75020R/100533825

Has anyone actually used this product or a similar one like it, and does it work and last?  Any ideas about it would be appreciated.

Thanks,
Bruce

gbwillson

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Reply with quote  #2 
Bruce-

I know people have used shade cloth instead of screen. I also recall that the shade cloth melted in on instance as it is made of plastic instead of fiberglas during a brief stagnation event. I picked up some shade screen rolls at the Habitat ReStore with the intention of using it as a back screen layer. I ended up using it on the windows where it made a noticeable difference in keeping the hot sun from beating in the window.

But up to this point I've simply doubled-up the back layer of screen to keep most of the sun from the back of the collector while still breaking up the laminar flow and allowing a small amount of air to pass behind and around the back layer.



Greg in MN
Bruce

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Reply with quote  #3 
Thanks....I didn't think of the heat factor.  Plastic huh?  Hmmmmmmmm 
gbwillson

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Reply with quote  #4 
Well, in theory, you should never allow a collector to get hot enough to melt things. But it only takes a few minutes without airflow to cause some potential damage. Solar Dan built a collector using shade cloth and melted it pretty good if I recall. I think others have too. There may be other, denser materials that could be used that are not susceptible to low melting temps. I think it kinda depends on the material used. Not all plastics have the same melting point. PVC melts as low as 165˚F, while nylon melts at temps over 400˚F! So if you have your eye on some shade cloth, look up the melting point of the material.

Greg in MN
SolarInterested

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Reply with quote  #5 
Quote:
Originally Posted by gbwillson
... Solar Dan built a collector using shade cloth and melted it pretty good if I recall.


http://simplysolar.supporttopics.com/post/landscape-fabric-as-an-absorber-6753113

https://d28lcup14p4e72.cloudfront.net/129967/1676002/melted_fabric.jpg

[image] 



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Both temperature rise and airflow are integral to comparing hot air collectors
gbwillson

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Reply with quote  #6 
Thanks SI. I remembered Dan's photos of the meltdown so vividly! So it wasn't shade cloth...My bad. In any case Bruce just make sure you know what the material is made of so you can check how it will handle the heat.

Greg in MN
Bruce

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Reply with quote  #7 
Yeah...thanks, guys.   I have asked about the temperature and my use.  Waiting for the information now.  Just got approval of my question from HD and will accept any advise from anyone, but hope I hear from the manufacturer of this product. There is no specific data on the website.  It seem like a slick idea for the back screen and since I am building 6 foot long box, it is definitely the right size for what I want to do. [idea]
Bruce

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Reply with quote  #8 
I got my answer from the manufacturer:   "We do not recommend using this product for that purpose. This product does not have a fire rating." Double screen it will be then ;-)
stmbtwle

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Reply with quote  #9 
That really doesn't tell you anything. I'll bet NONE of the screens we use have a fire rating.

There's another product called "solar screen" which is woven rather than knitted, and it can take the heat of a solar collector. https://www.lowes.com/pd/Phifer-Super-Solar-Screen-Wire/1000179071?cm_mmc=SCE_PLA-_-ToolsAndHardware-_-ScreenAndGlass-_-1000179071:Phifer&CAWELAID=&kpid=1000179071&CAGPSPN=pla&store_code=1911&k_clickID=0e93dea9-cca7-48b1-92bb-9dd51344a340&gclid=EAIaIQobChMIj9vi_pfW2QIVwSBpCh0YgQOEEAQYAiABEgKU9_D_BwE

It's quite dense though, and if your design requires the air to go THROUGH the fabric, it might not be suitable. It's also rather expensive.

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gbwillson

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Reply with quote  #10 
It can also be called shade screen or shade cloth. You can also buy it at garden supply stores. It can be purchased with various percentages of light allowed to pass through. 

http://www.teksupply.com/contractor/supplies/Search?catalogId=13552&searchMethod=wcSearch&searchType=ANY&searchBeginIndex=0&searchDefaultPerPage=50&ftSearchBeginIndex=0&ftSearchDefaultPerPage=50&searchQuery=shade+cloth

Greg in MN
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