The Great Bottle Opener Giveaway

Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > ferment temp: ambient vs carboy

Reply
 
LinkBack Thread Tools
Old 01-04-2010, 05:49 PM   #1
jermanimal
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2009
Location: Des Moines, IA
Posts: 75
Liked 1 Times on 1 Posts

Default ferment temp: ambient vs carboy

I just recently stuck a surface thermometer on a bucket after I had an Ale had almost a negative lag time. I have been keeping the carboys/buckets fermenting in the upstairs bathroom because basement is too cold right now. I have been making sure the room is about 68-70 and not worrying about it.

After this massive fermentation I had recently the bucket was really warm, and a surface thermometer was reading 78. Fermenting is an exothermic reaction, but what I am wondering is if the yeast temperature recommendations are based on keeping the temperature under control even during a very active primary fermentation? or is that the recommendation for ambient temperature of the room/closet/garage?

So, ultimately should I slow a active fermentation down to the recommended temperature by placing it in a cooler room until the fermentation slows down and yeasties quick creating extra heat.

-Jeremy

__________________
jermanimal is offline
 
Reply With Quote Quick reply to this message
Old 01-04-2010, 06:03 PM   #2
hoppysailor
Feedback Score: 0 reviews
Recipes 
 
Join Date: May 2009
Location: Montana
Posts: 135
Liked 1 Times on 1 Posts
Likes Given: 1

Default

Temperature recommendations are for the temperature of the fermenting wort. This is the temperature that you're concerned about.

__________________
Mountain View Brewery


hoppysailor is offline
 
Reply With Quote Quick reply to this message
Old 01-04-2010, 06:03 PM   #3
david_42
Feedback Score: 0 reviews
 
david_42's Avatar
Recipes 
 
Join Date: Oct 2005
Location: Willamina & Oak Grove, Oregon, USA
Posts: 25,648
Liked 131 Times on 124 Posts

Default

Yes, the fermentation temperature range is for the wort.

__________________

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 01-04-2010, 06:09 PM   #4
jermanimal
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2009
Location: Des Moines, IA
Posts: 75
Liked 1 Times on 1 Posts

Default

Ok, so my crazy active fermentation was fueled partially by an extra 8 to 10 degrees. I suppose I am going to have some off-flavors. I have been contemplating the fish tank heater in a bucket, to move the fermentation operation back to the basement. A good reason to actually do that.

__________________
jermanimal is offline
 
Reply With Quote Quick reply to this message
Old 01-04-2010, 06:31 PM   #5
beltbuckle
Feedback Score: 0 reviews
Recipes 
 
Join Date: Sep 2009
Location: Meridian, ID
Posts: 55
Liked 1 Times on 1 Posts

Default

How cold is your basement? A lot of ale yeasts will do great and ferment nice and clean in the low 60s, some down into the high 50's.

If it's in the low 50s, maybe consider doing some lagers.

__________________
beltbuckle is offline
 
Reply With Quote Quick reply to this message
Old 01-04-2010, 07:23 PM   #6
400d
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2009
Posts: 584
Liked 3 Times on 3 Posts
Likes Given: 1

Default

where I live, currently the outside temperature is -6 C (approx.) 20 F....

since I don't have a heating at home while I'm at work temperature at home falls to 6 C (approx 42 F) while I'm away...


I have a beer fermenting in my living room with US-05 yeast.... this morning I only covered loosely the carboy with an ordinary blanket...


when I got home, I put the thermometer inside the blanket, on the surface of the carboy, and guess what - temperature inside this blanket was 20 C (66 F) while the temperature in the room was 6 C (42 F)!?

so the conclusion is that fermentation produces huge amounts of heat.... what's going inside the carboy should worry you

__________________
Brew me a river...
400d is offline
 
Reply With Quote Quick reply to this message
Old 01-04-2010, 09:56 PM   #7
jmansfield
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
Recipes 
 
Join Date: Oct 2008
Location: Mount Vernon, IN
Posts: 94
Liked 4 Times on 4 Posts

Default

Yes, fermentation produces a significant amount of heat. A temperature rise of 8 degF on an uncooled carboy is believable - and it is also not good. Need to keep most ales around 70 or below to avoid esters and fusels. No need to dump the beer but it will likely taste like "homebrew". I now control fermentation temperatures by submerging my 6.5 gallon carboy in a temperature controlled water bath. I found that the heat transfer rate from my glass carboy into cool air was not high enough to maintain my fermentation temperature setpoint. The transfer rate is 10x higher when using water. Hope this is useful.

__________________
jmansfield 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
at what point would it help to increase the ambient temp? MisterGreen Beginners Beer Brewing Forum 4 10-15-2009 07:54 PM
Starters and ambient temp. bad coffee Fermentation & Yeast 6 08-17-2009 12:16 AM
Ideal Ambient Temp for Ales in Temp Controlled Environment? xinunix Beginners Beer Brewing Forum 4 05-12-2009 03:58 AM
Ideal ambient temp for lager fermentation temp? tinydancer Beginners Beer Brewing Forum 2 06-30-2008 03:54 PM
Evaporation sensitivity to ambient temp? skifast1 General Techniques 16 01-21-2008 08:19 PM