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Home Brew Forums > Home Brewing Beer > General Beer Discussion > Keezer rant
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Old 04-05-2014, 06:46 AM   #11
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Wood is actually a pretty good thermal insulator. It's certainly not a good thermal conductor.
Hence why I went with 2" thick oak (dense wood).
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Old 04-05-2014, 07:29 AM   #12
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Wood in general has an R value of about 1 - 1.6 per inch, softwoods generally better insulators than hardwoods. While a wood collar alone is a better insulator than would be a metal structure I think using foam insulation would improve things quite a bit. Styrofoam R value is about 3.6 - 4 per inch and other foam board are higher still.

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Old 04-07-2014, 05:08 PM   #13
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Wood is actually a pretty good thermal insulator.
Compared to what? Metal? Air? Certainly not good compared to actual insulation.
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Old 04-07-2014, 11:45 PM   #14
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A wood collar is more than enough insulation for a simple keezer. There's not much heat transfer there and the layers of 2" foam board that a lot of people are engineering into their collar design is just not necessary.

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Old 04-08-2014, 12:01 AM   #15
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OP, I don't live in Texas but summers here get pretty hot, over a hundred for 3 or so months. The chest freezer I used I bought new in 2003, it lived in the garage the whole time. Sold it last year, still worked well. I think you've just had a bad run of luck on freezers.

If it isn't costing you an arm and leg to run, you could keep it around and plug it in when you need a fermenation chamber.

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Old 04-08-2014, 12:46 AM   #16
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I have thought of that Dan, however, I don't think the freezer cools at all, just bad luck I guess

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Old 04-08-2014, 01:08 AM   #17
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Truly, unless you're going large, you could buy a new freezer for a few hundred dollars. Star efficient and all that. When you pick a temp controller get one that has a good spread on the on/off cycle. I had an analog Johnson, worked just fine. Also what helped it from cycling on and off was putting the probe in a large glass of water.

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Old 04-08-2014, 04:09 AM   #18
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Quote:
Originally Posted by masonsjax View Post
A wood collar is more than enough insulation for a simple keezer. There's not much heat transfer there and the layers of 2" foam board that a lot of people are engineering into their collar design is just not necessary.
Right - if you compare the surface area of the collar to the entire surface area of the keezer where heat can be gained it's probably like 10 - 15% of the surface. The freezer itself probably doesn't have much more than 1 1/2 inches of foam in the walls, maybe not even that, so the net result is not a huge loss of efficiency.
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Old 04-08-2014, 04:44 AM   #19
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Quote:
Originally Posted by Hamaki View Post
Wood in general has an R value of about 1 - 1.6 per inch, softwoods generally better insulators than hardwoods. While a wood collar alone is a better insulator than would be a metal structure I think using foam insulation would improve things quite a bit. Styrofoam R value is about 3.6 - 4 per inch and other foam board are higher still.
I got some roll out insulation that I put over the wood.
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Old 04-08-2014, 04:52 AM   #20
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An inch of rigid XPS foam lining a wood collar is a worthwhile additional, imo...

Cheers!

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