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Old 01-13-2014, 05:27 PM   #1
nicklawmusic
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Default Temperature Control

My fermentation has just kicked in an my wort has been running at 24c all day (it stipulates 18-20c) whilst I've been out all day. I put my brew belt on this morning as the wort was below temperature.

How imperative is it in the primary stages of fermentation (particularly during the first 48 hours) that I keep my brew at a steady temperature and how do I achieve this in a cellar with a brew belt without my temps going up and down all the time.

Any ideas?

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Old 01-13-2014, 05:38 PM   #2
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For starters, if you don't have a cooling source to bring the temp DOWN, I wouldn't use a brewbelt, which is designed to keep temps up.

It's VERY important to keep temps fairly stable and in the yeast's preferred range. At 24C you're too high. If this is the first big day of fermentation, the results are likely irreversible and you're going to get higher alcohols/fusols/jet fuel/hot type esters from the yeast. I'd get the belt off of there. If the temp dipped one degree below the target it won't hurt you. If the belt kicked in and thrust it 4 degrees ABOVE the target, it'll have a negative impact.

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Old 01-13-2014, 05:48 PM   #3
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Great :/

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Old 01-13-2014, 05:58 PM   #4
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Well what yeast are you using? 24C might be okay.

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Old 01-13-2014, 06:11 PM   #5
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24C = 75 F. That's too hot for almost any yeast besides Saison.

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Old 01-13-2014, 09:49 PM   #6
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It was just a dried yeast that came with the beer kit. It didn't say on it what strain of yeast it was.

The FV was at 24c for around 3 hours, after which I turned the belt off and allowed the wort to cool.

Now it's back to 20c where it should be.

Have I totally ruined my beer on that 3 hour period?

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Old 01-13-2014, 09:52 PM   #7
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There may be some off flavors, but it will still be beer at the end.

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Old 01-13-2014, 10:16 PM   #8
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So when people say 'off flavours' what do they mean? Is it something that's going to be terribly noticeable or just kind of like, 'that tastes okay but with a strange twang'?

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Old 01-13-2014, 10:29 PM   #9
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Off flavors are basically unintended flavors. Yeast can produce different flavors at different temperatures. In particular, yeast tends to produce harsh alcoholic/solvent and fruity/green apple flavors when operating above its preferred temp range. Even within the temp range the flavors can vary. This varies from strain to strain.

http://www.howtobrew.com/section4/chapter21-2.html

Honestly, unless you're a seasoned beer taster, or you had the "correct" beer to directly compare the taste against, you might not even notice unless it's really bad. Either way, you made beer that will be drinkable. If you don't like it then send it to me.

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Old 01-13-2014, 11:01 PM   #10
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LOL! Thanks.

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