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Old 02-16-2012, 08:27 PM   #1
cbird01
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Default Are you using reflectix? - some thoughts

The thing I see people miss is that Reflectix actually has a very small R-value - and the R-values they quote are very misleading. They somehow translate their heat loss reduction that is gained from reducing RADIANT heat transfer, which really has no correlation to R-value at all by definition. The air space in the bubbles is actually only R-1.1(from conduction). This is from the manufacturer and I don't even buy that. Undisturbed air space has an R-value of about R-1 per inch. By definition, R-value only covers conductive heat losses. However, the whole premise of Reflectix, is really to block radiant heat transfer. The only way you get a true value from it is if you are somehow stopping RADIANT heat transfer. In order to stop radiant heat transfer (which is heat transfer from a hot surface to a cold surface across an air space), you MUST have an air space. It barely helps if you wrap a MLT in Reflectix without an air gap. Additionally, adding additional layers does not really help things much, since you have no air gaps between layers and are relying only on the conductive heat loss from having an air space in the bubble.

The air gap must also be air tight. So, you need to tape all seams and ends of the sheets . This will then be reflecting the radiant heat back to the MLT. The key is that air gap must be air tight, or Convection will ruin the whole gain by the Reflectix application.

So when you do your project, make sure to create an air gap and make that air space, air tight. You will see much better results than without.

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Old 02-22-2012, 11:32 PM   #2
forcabrew
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Pics? I was thinking of using reflectix just so I didn't have to polish my dirty keggles. I figured the reflectix would look good as well as help with maintaining temps and help with raising temps quicker

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Old 02-23-2012, 03:12 PM   #3
cbird01
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Quote:
Originally Posted by forcabrew
Pics? I was thinking of using reflectix just so I didn't have to polish my dirty keggles. I figured the reflectix would look good as well as help with maintaining temps and help with raising temps quicker
I have another thread with pics for my MLT reflectix air gap(not finished yet), but be careful doing it on direct fire vessel. I think the reflectix melts pretty easy.

I created concentric rings of 1/2 in foam and will seal the ends with a sealant. Insulating direct fire brings a whole new set of issues.
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Old 03-09-2012, 03:42 PM   #4
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check out this thread for info on Reflectix with pics and data

http://www.homebrewtalk.com/f11/refl...w-biab-262083/

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