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General Category => Yeast and Fermentation => Topic started by: KellerBrauer on January 25, 2021, 05:50:49 am

Title: Raising Fermentation Temperature
Post by: KellerBrauer on January 25, 2021, 05:50:49 am
I have seen several fermentation schedules that call for the fermentation temperature to be raised progressively over the coarse of a few days. I have seen this type of fermentation in both lagers and ales.  What does this type of schedule do?  What’s it’s purpose?
Title: Re: Raising Fermentation Temperature
Post by: PORTERHAUS on January 25, 2021, 06:08:12 am
I have seen several fermentation schedules that call for the fermentation temperature to be raised progressively over the coarse of a few days. I have seen this type of fermentation in both lagers and ales.  What does this type of schedule do?  What’s it’s purpose?


For the most part it's something that has just become homebrewer standard practice for many. The idea being to keep the yeast warm, happy, active and keep them working after the bulk of primary fermentation. It is "claimed" it can help a beer attenuate better, keep from stalling out and some will say give the beer time and a better chance to "clean up after themselves".

What I do and I would think most others do is I don't have detailed or exact fermentation schedule. For the first 3-4 days or so of fermentation I will control my temps, after that I will just let temps rise from there within reason. I don't get particular about going 1 degree per day or ferment x days at 65, then 67, then 70...etc. Control primary fermentation, but after that I rather let temps rise a bit then fall. I do not brew a lot of Lagers, but the same idea applies. For Ales and Lagers especially, a D-rest at a warmer temperature is often suggested. But starting with a good healthy yeast pitch and a good fermentation, these extra steps aren't really necessary IMO but the idea is...well it doesn't hurt either.

Title: Re: Raising Fermentation Temperature
Post by: erockrph on January 25, 2021, 07:22:52 am
I think that some of this comes from large breweries like Fullers and Urquell that have rather complex fermentation schedules for some of their beers. But that is for a specific yeast in a specific recipe at a specific brewhouse that has been brewed thousands of times with consistent results. There is no reason you can't do the same at a homebrew level if you want, but personally I get results I like from a simpler fermentation schedule.

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Title: Re: Raising Fermentation Temperature
Post by: KellerBrauer on January 25, 2021, 09:10:36 am
Both are good logical responses - thank you.  However, I'm wondering, we know that yeast creates esters at higher temperatures.  So, by pushing the upper temperature limits of a yeast should also promote higher ester production as well, wouldn't it?
Title: Re: Raising Fermentation Temperature
Post by: Richard on January 25, 2021, 09:21:44 am
Both are good logical responses - thank you.  However, I'm wondering, we know that yeast creates esters at higher temperatures.  So, by pushing the upper temperature limits of a yeast should also promote higher ester production as well, wouldn't it?

The production of most of the compounds that provide flavor, including esters, takes place in the early stages of fermentation. After most of the fermentation is complete you can let the temperature rise without producing esters.