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Home Brew Forums > Home Brewing Beer > DIY Projects > Chillers and Stir Plates > so i started my chiller build today
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Old 02-24-2009, 09:58 PM   #1
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Default so i started my chiller build today

i guess it was going well. it was frustrating coiling the copper, but i hope it does a good job.



i used a piece of square aluminum for the support and then ran 2 different sized coils through it. i havent decided yet if i am just going to connect the two at the bottom or if i am going to extend them and make it 2 completely separate coils giving each a cold water feed or just make it all one big coil.

ideas?

if i make it all one piece should i have the cold go to the inner coil first or the outer

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Old 02-25-2009, 11:31 PM   #2
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Old 02-25-2009, 11:57 PM   #3
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wait, are you going to stick that big ass rod in with the chiller too?

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Old 02-25-2009, 11:59 PM   #4
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I think you'd be best to have to cold water in go to the bottom on the outer edge first. If you want to maximize heat transfer, you need to keep the temperature delta as high as possible. The outer edges should be cooler than the center due to heat lost through the walls of the kettle, and wort will be warmer at the top than the bottom since cold sinks and heat rises... though the effects of this my be negligible. The biggest thing I've found to speeding up cooling with an IC is to move it around in the wort... the effects of that will be much more noticable than whether you run the water in to the middle/top or outside/bottom.

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Old 02-26-2009, 12:13 AM   #5
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i am going to cut down the aluminum pole to be just about 5 inches above the copper for a handle

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Old 02-26-2009, 02:40 AM   #6
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It's been a while since I was up on all the metal interactions, but I'm thinking aluminum and copper aren't the best of friends.

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Old 02-26-2009, 12:47 PM   #7
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where could i get more info on the aluminum copper reactions? is this something i should be worried about?

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Old 02-26-2009, 12:54 PM   #8
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I found this on Google but it's by no means any kind of scientific study.

Never Mix Metals Copper Aluminum Flashings

I'd think you'd also need to know if the makeup of wort had any influence for it to really matter.

My experience in all this was also from a roofing metals perspective. It might not apply here.

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Old 02-26-2009, 09:33 PM   #9
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crap, now you have me all nervous. i was so excited about my idea. now i might just scrap it and start over.

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Old 02-26-2009, 09:54 PM   #10
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Yup, it's called the Galvanic Scale. If two metals are going to be in contact for a long period of time, you want them as close to each other on the Galvanic Scale as possible. Aluminum and Copper are pretty far apart so you'll see the Aluminum corrode and coat the copper.

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