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methc

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Posts: 4
Reply with quote  #1 
Hey guys,

I'm new on here and I'm intrigued by the CPVC solar collector Scott showed in his video. I'm wondering if I can use Reflectix instead of PolyIso that Scott used. 

stmbtwle

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Reply with quote  #2 
Check the heat rating.  Your collector can easily get over 200F if it stagnates (and it will, sooner or later). We use Polyiso because it will take the heat.  Styrene-based insulation will melt.

Reflectix is rated to 180F I don't think it would hold up.

http://www.reflectixinc.com/basepage.asp?PageIndex=384#DifferencesinPerformance?

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
methc

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Posts: 4
Reply with quote  #3 
Thanks for the reply. I'll go to the store tomorrow and confirm what the max temp it can handle is.

There's another material I found locally today called P3. It's from Italy. I don't know the ratings tho. I'll google it now.
methc

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Reply with quote  #4 
Alright, so here's an update. The other material I mentioned (P3) can't work since it has an even lower temp rating of just 85 deg F. 

I can't find polyiso or any other insulation material locally. I might be forced to use reflectix, is there anything I can do to make the reflectix work for my solar water heater?
stmbtwle

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Reply with quote  #5 
How about fiberglass? You may be able to find fiberglass duct board (for HVAC ducts). I think it's more expensive though.

I'd check that P3 rating. More likely it's in Celsius. 85C is still marginal, but might work if it's on the outside of something else.

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
gbwillson

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Reply with quote  #6 
Methc, you don't mention were you are located, but in a moderate climate, you may be able to use Reflextix without an issue. Also, someone in your area may know of different sources for insulation products.

An issue with reflective-type products like Reflectix is they work best when there is an air space left between the heat, or cold source and the product itself. Reflectix website sells spacers for this or you can make your own spacers from scraps. A single layer itself, without the air space, has a pretty low R-value. So, while they may be thin and easy to work with, by the time you add in the air space, other insulation products may be a better choice.


Greg in MN

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