From the HBD Archive
From: djt2@po.CWRU.Edu (Dennis J. Templeton)
Subject: Copper tubing lengths
Date: 1992-06-17 21:37:48 GMT

Chris... here's a data point on the immersion chiller.

I made one recently with 16 feet of 1/4 copper tube (that's the longest
piece they had in stock). There are probably 14 feet in the wort.

This will chill a 6 gallon boil to pitching temp (probably 80 degrees;
I have been loath to put in a thermometer) in 25 minutes.

The water flow rate is about a gallon a minute; even at this low flow the
water coming out is pretty cool. It warms considerably if you move the
tubing or swirl the pot. I get the idea that the liquid immediately around
the tube is chilled quickly and that the limiting factor is mixing.

Were I to do it again, I'd use 25-30 feet of 1/4 inch, and I think the chill
time would be closer to 15 minutes. I don't see the advantage of 3/8 inch
tubing since the effluent is not fully warmed. I think maximizing surface
area (small tubing) is more important than total flow (large tubing).

good luck,

dennis

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