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View Full Version : Homebuilt Glycol Chiller for wort cooling?



jcmcdowell
10-26-2014, 12:21 PM
I have a 55 gal brew system and 3 bbl fermenters.

I'm doing the DIY homebuilt glycol AC/cooler route.

I have a 5k BTU AC, a 70 QT cooler. Do you think I can knockout 50 gallons of wort to 65 F using this?

Maybe do a dual stage cooling? I just hate wasting so much water in knockout.

Thanks,

JC

a10t2
10-26-2014, 01:50 PM
A BTU is just the energy required to cool 1 lb of water by 1F:

50 gal * 8.8 lb/gal * (210 - 65)F = 63,800 BTU

So if you wanted to knockout in 45 min, you'd need about 85k BTU/hr. Even assuming 100% efficiency, at 5k BTU/hr you could only cool the wort by ~8F in those same 45 minutes. So you could use it as a secondary provided you cool to ~70F using the primary first.

jcmcdowell
10-26-2014, 02:08 PM
Good to know the math. Thanks for that.

Guess we're sticking with municipal water for chilling for now.