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  #1  
Old 03-20-2017, 10:33 AM
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Mike Treadway
 
Join Date: Feb 2013
Location: Keller, TX
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Default Fermentation Temps

I talked about this at a meeting last year and thought I'd bring it up again since I just noticed it again this morning.

We brewed an Imperial Brown ale on Saturday with an OG of 1.099. Take a look at the difference between the wort (via thermowell) and the ambient air in the chamber. The average ambient air temp (blue line) is 14C while the wort temp (green line) is 18.5C. That's a 4.5C difference, or a little more than 8 degrees fahrenheit!

I know some folks in the club control fermentation temps by measuring the ambient air. If you do this, be sure to compensate for the heat being generated by the fermentation itself. If you're one of those people, there's a good chance that if you had controlled your ambient air temp to be 18.5C (65F), it would have been fermenting at 23C (73.5F). That's quite a big difference. I've found that the bigger the beer in OG, the more heat being generated, which makes sense.

Anyway, I saw that this morning and thought I'd share. If you find your big beers seem to be a little hot, solvent, or having too many fusel alcohols; this could be your problem.

Attached Images
File Type: png Imperial Brown - Hi Res.png (62.5 KB, 12 views)
File Type: png Imperial Brown - Lo Res.png (65.9 KB, 7 views)

Last edited by vertigo; 03-20-2017 at 10:51 AM.
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  #2  
Old 03-20-2017, 10:50 AM
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Brandonovich Brandonovich is offline
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Really good info Mike!
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Keg 1:Mixed Berry Cyser
Keg 2:Chipotle Chocolate Porter
Keg 3American Brown Ale
Keg 4Oak Aged Chardonnay Imperial Saison
Bottled: Monster Ale, Rocket Fuel
Fermenting:Salted Grapefruit Saison, Rose hip and Heather Tip Bock, Pumpkin Spice Belgian Cider


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And if your bottle's empty
Help yourself to mine
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Old 03-20-2017, 01:19 PM
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John Shank
 
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Really good stuff Mike, I just wished you guys could a made a regular Brown Ale. It seems as though The Goat Hunters are enamoured w/ gravity.....
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Old 03-20-2017, 02:02 PM
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Mike Treadway
 
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Location: Keller, TX
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Quote:
Originally Posted by DarkWing View Post
Really good stuff Mike, I just wished you guys could a made a regular Brown Ale. It seems as though The Goat Hunters are enamoured w/ gravity.....
Hmmm...really? Prior to Saturday, the last 4 beers brewed by AGH: Rye IPA, English IPA, ESB, and American Pale Ale.

But bringing this back to the discussion at hand. Thanks guys, I hope this kind of information gives others some food for thought.
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Old 03-20-2017, 02:04 PM
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Brandonovich Brandonovich is offline
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I once had a temp probe fall off a fermenter during active fermentation, and when it was re-applied, there was a 10 degree difference in temperature. So many people don't understand how much heat is generated by yeast when they are doing their thing.
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Keg 1:Mixed Berry Cyser
Keg 2:Chipotle Chocolate Porter
Keg 3American Brown Ale
Keg 4Oak Aged Chardonnay Imperial Saison
Bottled: Monster Ale, Rocket Fuel
Fermenting:Salted Grapefruit Saison, Rose hip and Heather Tip Bock, Pumpkin Spice Belgian Cider


"As cliche as it may sound
I'd like to raise another round
And if your bottle's empty
Help yourself to mine
Thank you for your time
And here's to life"
Reply With Quote
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