Controlling Fermentation Temperature - Page 2 - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > General Techniques > Controlling Fermentation Temperature

Reply
 
Thread Tools
Old 07-01-2008, 12:34 PM   #11
Bobby_M
Vendor and Brewer
HBT_SPONSOR.png
 
Bobby_M's Avatar
Recipes 
 
Aug 2006
Whitehouse Station, NJ
Posts: 23,339
Liked 1766 Times on 1123 Posts


Whatever cooling method you use, as long as you're conscious of the wort temp you'll be ok.

I have the temp controller's probe rubberbanded to the barleywine better bottle with the temp set to 67F. In order to get the fermenting wort to that set temp, the ambient of the fridge stays a consistent 10F lower for at least the entire second day of active ferementation.

I got this upright freezer for $20 on Craigslist 2 years ago.
__________________
Welcome to BrewHardware.com. I love you.
New Stirplates are IN!
Chugger Pumps, Pump Kits, Camlocks, Sightglasses, Clear USA made Silicone Tubing, RIMS, Electric Install Parts, etc.

 
Reply With Quote
Old 07-01-2008, 12:50 PM   #12
TexLaw
Here's Lookin' Atcha!
HBT_LIFETIMESUPPORTER.png
 
TexLaw's Avatar
Recipes 
 
Sep 2007
Houston, Texas
Posts: 3,670
Liked 28 Times on 26 Posts


Bobby's results are not some freak event. Any brewer should count on actively fermenting wort coming in at 5-10F over ambient. That is a wide range when it comes to fermentation, and it depends on a whole boatload of factors (e.g., yeast, fermentability of wort, what else is in the fermenting fridge, air currents, and even the ambient temperature).

I don't know if fermentation temperature control is the most important part of brewing, but it certainly is no less important than any other part of the process.


TL
__________________
Beer is good for anything from hot dogs to heartache.

Drinking Frog Brewery, est. 1993

 
Reply With Quote
Old 07-01-2008, 03:47 PM   #13
Baron ken
HBT_LIFETIMESUPPORTER.png
Recipes 
 
Jun 2008
Gardner, Kansas
Posts: 394
Liked 4 Times on 3 Posts


Quote:
Originally Posted by Bobby_M View Post
...I have the temp controller's probe rubberbanded to the barleywine better bottle with the temp set to 67F. In order to get the fermenting wort to that set temp, the ambient of the fridge stays a consistent 10F lower for at least the entire second day of active ferementation.
When you use the liquid temp to control the temp controller, doesn't that cause the actual liquid temp to fluctuate more? For example, if you set the temp controller to 67F and the liquid rises to or above that, the fridge kicks on and stays on until the liquid drops to 66F (using a 1F differential here), but the fridge had been running for quite awhile to cause that liquid temp change and is now very cold, so now the liquid overshoots and continues dropping for a few more degrees. Then as the liquid warms back up it gets to 67F again and the fridge kicks on, but it will take awhile to get it cold enough to drop the liquid temp, so the liquid overshoots in the warmer direction this time.
I'm not sure how big a fluctuation this is, but it seems that using the ambient air temp with a 1F differential would keep a more consistent temp. I haven't tested this yet as I just got mine set up not long ago.
Also, if you use the liquid temp of one of the beers, the other beers are being temp controlled by how active the one being monitored is.

I'm guessing all the above doesn't matter as long as I keep it cool enough for all the beers.

 
Reply With Quote
Old 07-01-2008, 04:45 PM   #14
Bobby_M
Vendor and Brewer
HBT_SPONSOR.png
 
Bobby_M's Avatar
Recipes 
 
Aug 2006
Whitehouse Station, NJ
Posts: 23,339
Liked 1766 Times on 1123 Posts


Quote:
Originally Posted by Baron ken View Post
When you use the liquid temp to control the temp controller, doesn't that cause the actual liquid temp to fluctuate more? For example, if you set the temp controller to 67F and the liquid rises to or above that, the fridge kicks on and stays on until the liquid drops to 66F (using a 1F differential here), but the fridge had been running for quite awhile to cause that liquid temp change and is now very cold, so now the liquid overshoots and continues dropping for a few more degrees. Then as the liquid warms back up it gets to 67F again and the fridge kicks on, but it will take awhile to get it cold enough to drop the liquid temp, so the liquid overshoots in the warmer direction this time.
I'm not sure how big a fluctuation this is, but it seems that using the ambient air temp with a 1F differential would keep a more consistent temp. I haven't tested this yet as I just got mine set up not long ago.
Also, if you use the liquid temp of one of the beers, the other beers are being temp controlled by how active the one being monitored is.

I'm guessing all the above doesn't matter as long as I keep it cool enough for all the beers.
Actually, my point is exactly the opposite. If you put your probe in the open cabinet of the fridge you have to make some assumptions about what the fermenting wort will run at. If you guess 10F and you're right, no problem.

I like attaching the probe to the exterior of the carboy. It's more temp stable than the open air and represents the wort temp more closely. You would get those wild fluctuations you talk about if you had the probe in a thermowell deep in the core of the wort.
__________________
Welcome to BrewHardware.com. I love you.
New Stirplates are IN!
Chugger Pumps, Pump Kits, Camlocks, Sightglasses, Clear USA made Silicone Tubing, RIMS, Electric Install Parts, etc.

 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Measuring & Controlling Fermentation Temperature Bearcat Brewmeister General Techniques 16 01-29-2012 01:28 AM
Whats the best Temperature controller for fermentation temp controlling? Anthony_Lopez Equipment/Sanitation 30 07-11-2010 05:36 AM
Controlling Ambient Temperature xinunix Beginners Beer Brewing Forum 4 03-08-2009 06:43 PM
controlling fermentation temperature THEDIETZ General Techniques 8 11-12-2008 10:08 PM
Controlling the temperature Beer is good All Grain & Partial Mash Brewing 12 08-31-2006 07:07 AM


Forum Jump