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Old 03-19-2013, 02:20 AM   #331
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Well. I just bought a 40qt aluminum pot and am putting a 1500w element to supplement my stove. And a drain valve. It is my own fault for not looking up the galvanic corrosion issue. But reading above puts me at a bit of ease.

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Old 03-27-2013, 09:14 AM   #332
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I havent been able to find any definitive information on this in off the SS vs Al pot discussions. But do you think there is any noticable difference in propane usage given the fact that the thermal conductivity of Al is so much better than SS. For reference the conduction coefficient of Al is 250W/mK where SS is only 16W/mK

Found this on the internet though

Example - Conductive Heat Transfer through a Aluminum versus Stainless Steel Pot
The conductive heat transfer through a pot wall can be calculated as

q / A = k dT / s

where

q / A = heat transfer per unit area (W/m2)

k = thermal conductivity (W/mK)

dT = temperature difference (C)

s = wall thickness (m)

Conductive Heat Transfer through Aluminum Pot Wall with thickness 2 mm and temperature difference 200C
q / A = 250 (W/mK) x 200 (C) / 2x10^-3 (m)

= 25000 (kW/m2)

Conductive Heat Transfer through Stainless Steel Pot Wall with thickness 2 mm and temperature difference 200C
q / A = 16 (W/mK) 200 (C) / 2 10-3 (m) = 1600 (kW/m2)

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Old 03-27-2013, 03:58 PM   #333
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Well most Al kettles are 4-6mm thick and most SS kettles are .8-1.2mm thick so here's the updated #'s:

Conductive Heat Transfer through Aluminum Pot Wall with thickness 5 mm and temperature difference 200C
q / A = 250 (W/mK) x 200 (K) / 5x10^-3 (m)

= 10000 (kW/m2)

Conductive Heat Transfer through Stainless Steel Pot Wall with thickness 1 mm and temperature difference 200C

q / A = 16 (W/mK) 200 (K) / 1x10^-3 (m)

= 3200 (kW/m2)

So the aluminum will conduct heat in at a rate 3 times more than the stainless BUT it will also conduct heat out 3 times quicker too. Since there is more wall area than bottom area the heat lost may equal out the Al and SS or Al may end up losing more heat due to the large wall surface area and higher conductivity.

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Old 04-01-2013, 02:08 AM   #334
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I'm cheap, so I use aluminum pots that I get for tamales. A 52qt pot for $30, you can't go wrong. I did notice, when I was oxidizing them, they actually retained the heat pretty well. It was in the high 40s over night outside, they were still over 120 degrees the next morning. (After about 7 hours)

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Old 04-17-2013, 04:08 PM   #335
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passive oxide layer must be built up before brewing (**see note below) with a new aluminum kettle, although it is very easy to maintain

Where is the note that says how to do this?

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Old 04-17-2013, 06:50 PM   #336
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Quote:
Originally Posted by Hall_Brewing
passive oxide layer must be built up before brewing (**see note below) with a new aluminum kettle, although it is very easy to maintain

Where is the note that says how to do this?
Just fill it up and boil water in it for at least an hour before you use it. Personally, I did 2 hours but kept topping it off as water evaporated.
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Old 04-19-2013, 01:38 PM   #337
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Quote:
Originally Posted by xtian116 View Post
Just fill it up and boil water in it for at least an hour before you use it. Personally, I did 2 hours but kept topping it off as water evaporated.
Overkill, IMO.

Just take it out of the box and use it. It will be fine.
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Old 04-19-2013, 02:57 PM   #338
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Quote:
Originally Posted by CGVT

Overkill, IMO.

Just take it out of the box and use it. It will be fine.
Yea I'm tempted to agree here as well...perhaps a little cleaning prior to use is warranted, but I agree that the level of concern for oxidizing aluminum pots is overstated...aluminum will oxidize plenty through use.

I've never read a post, "first batch ruined, didn't oxidize my kettle". Aluminum oxidizes to some extent in air almost instantly.
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Old 04-19-2013, 03:51 PM   #339
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Quote:
Originally Posted by wilserbrewer

Yea I'm tempted to agree here as well...perhaps a little cleaning prior to use is warranted, but I agree that the level of concern for oxidizing aluminum pots is overstated...aluminum will oxidize plenty through use.

I've never read a post, "first batch ruined, didn't oxidize my kettle". Aluminum oxidizes to some extent in air almost instantly.
Your both probably right. When I first started I don't even think I cleaned that turkey fryer when I un-boxed it. Figured is was going to be boiled. When I got my bigger pots, I was a little overkill on them because I wanted them to look like the old ones. Maybe it was my brewing that got better and not the layer on the pot.
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Old 06-01-2013, 12:57 PM   #340
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Just ruined an aluminum kettle with oxy clean...... lesson learned read first! Correction read everything first....

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