Electric Brewing Supply 30A BCS Giveaway!


Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Just what is the fermentation temperature....?
Reply
 
LinkBack Thread Tools
Old 11-11-2009, 03:31 AM   #1
Kershner_Ale
Feedback Score: 0 reviews
Recipes 
 
Join Date: Nov 2008
Location: Anchorage, AK
Posts: 187
Liked 3 Times on 3 Posts

Default Just what is the fermentation temperature....?

I haven't gotten too sophisicated in my brewing techniques just yet, but have been thinking about controlling my process a bit more. Fermentation temperatures being one area I'd like to have more control over. Up until now, I've just used the Fermometer adhesive tapes you stick to the side of the carboy to indicate temperatures. Not really sure how precise and accurate these are, but they've helped me produce some damn fine beer thus far. Anywho, I've heard that yeast respiration actually produces it's own heat. Adding an additional 5-10 degrees...? I'm assuming the added amount varies depending on whether it is a really high gravity liquid vs. low gravity or a very active, strong fermentation vs. slow, lethargic fermentation, etc.

So a few questions I've been pondering: do the Fermometer tapes reflect the overall temperature of the liquid (ambient temp + additional degrees added due to yeast respiration)? If the Fermometer tapes (or whatever other external thermometer you might be using) only reflects ambient temperature, then I should not be adjusting temperature control based on what the tape is reading as the internal temperature of the liquid will be higher, correct? Also, I'm just curious if anyone has ever used a really accurate thermometer to measure the internal liquid temperature during active fermentation and compared that with what the cheaper temp gauges might be reading?

__________________

Kershner_Ale is offline
 
Reply With Quote Quick reply to this message
Old 11-11-2009, 04:07 AM   #2
oldschool
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2009
Location: southern IN
Posts: 738
Liked 2 Times on 2 Posts
Likes Given: 1

Default

I have yet to actually test your thoughts by observing the temp strip Vs using an internal thermocouple. On the other hand I've seen the temp strip display 3-8 degrees warmer than the ambient temp for the first few days then slowly drop back down to ambient air temperature. I have one now that's been in the primary since saturday night and we're having to keep the room temp in the low 60s to keep the strip reading 68ish. I think that the surface of my fermenter is conductive enough to display the actual internal temperature close enough to keep everything happy. I doubt i've answered your question. I'm sure someone like Pol will put in his two cents worth...

__________________
oldschool is offline
 
Reply With Quote Quick reply to this message
Old 11-11-2009, 04:39 AM   #3
Blender
Feedback Score: 0 reviews
 
Blender's Avatar
Recipes 
 
Join Date: Jan 2006
Location: Santa Cruz, CA.
Posts: 3,116
Liked 5 Times on 4 Posts

Default

Those fermometer strips are pretty good.I think they display an accurate enough temperature of the liquid inside to rely on them. Just don't get them wet because then they get screwy.

__________________

Gary

Blender is offline
 
Reply With Quote Quick reply to this message
Old 11-11-2009, 04:42 AM   #4
Palefire
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jun 2009
Location: SF, CA
Posts: 1,130
Liked 11 Times on 8 Posts
Likes Given: 3

Default

I haven't tested the strips either, but there are a lot of threads around here where people say they have, and that fermometer strips matched pretty well with the internal temp of the liquid.

I do know that lots of the big names here use them, and that they seem to be happy with their beers!

__________________
Palefire is offline
 
Reply With Quote Quick reply to this message
Old 11-11-2009, 02:43 PM   #5
david_42
Feedback Score: 0 reviews
 
david_42's Avatar
Recipes 
 
Join Date: Oct 2005
Location: Willamina & Oak Grove, Oregon, USA
Posts: 25,654
Liked 135 Times on 128 Posts

Default

A bunch of tests were run 2-3 years ago and the temperature of the strip accurately reflects the wort temperature. Even a plastic bucket is more conductive than air.

__________________

Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"

"I would like to die on Mars, just not on impact." Elon Musk

david_42 is offline
 
Reply With Quote Quick reply to this message
Old 11-11-2009, 04:05 PM   #6
samc
Feedback Score: 1 reviews
Recipes 
 
Join Date: Aug 2008
Location: Portland OR
Posts: 5,420
Liked 54 Times on 51 Posts
Likes Given: 29

Default

I am currently fermenting in a 15 gallon Corny style keg. Checked the temps of the side of the container last night and at the bottom it was 61F and near the top of the liquid level it was 70F. Moral of the story is knowing where to measure and no matter what you do you are going to end up with beer.

In the past using a thermo strip I found it to be accurate pre & post active fermentation.

__________________
samc is offline
 
Reply With Quote Quick reply to this message
Old 11-11-2009, 06:00 PM   #7
DKershner
Feedback Score: 1 reviews
Recipes 
 
Join Date: Jul 2009
Location: Bend, OR
Posts: 1,870
Liked 25 Times on 21 Posts

Default

In case the other 7 posts weren't enough, general concensus is that the outside of glass/plastic/stainless containers is within 1 degree of the internal temperature.

Secondly...your name looks familiar...

__________________
DKershner is offline
 
Reply With Quote Quick reply to this message
Reply



Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
fermentation temperature aliu630 Beginners Beer Brewing Forum 1 09-29-2008 08:03 PM
Fermentation Temperature fvoris Beginners Beer Brewing Forum 4 07-23-2008 11:34 PM
Fermentation Temperature Joe Camel General Techniques 3 04-10-2008 08:05 PM
Fermentation temperature/ambient temperature superfluent General Techniques 1 02-03-2008 07:34 PM
Fermentation temperature Guiness Beginners Beer Brewing Forum 2 03-30-2006 09:40 PM