Coldbreak Brewing HERMS Giveaway!

HomeBrewSupply AMCYL Brew Kettle Giveaway!


Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Fermentation temperature clarification
Reply
 
Thread Tools
Old 01-12-2012, 10:30 PM   #1
AbeLincoln
Feedback Score: 0 reviews
Recipes 
 
Join Date: Oct 2010
Location: New England
Posts: 38
Liked 5 Times on 2 Posts

Default Fermentation temperature clarification

Does "fermentation temperature" refer to the temperature inside or outside of the fermentation vessel?


AbeLincoln is offline
 
Reply With Quote
Old 01-12-2012, 10:36 PM   #2
copyright1997
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jul 2011
Location: Albany, NY
Posts: 1,403
Liked 44 Times on 37 Posts
Likes Given: 16

Default

Quote:
Originally Posted by AbeLincoln View Post
Does "fermentation temperature" refer to the temperature inside or outside of the fermentation vessel?
Inside.

If measuring outside, try to get as accurate of a reading as you can. For my cheapo ebay digital temperature controller, I use bubble wrap around the temperature probe which I tape to the outside of the plastic fermentation bucket. I also try to stay near the bottom of the fermentation range. For example, I set my fermentation temperature to 64-65 when using s-04 yeast.


__________________

Last n brews: (P=Primary) (K=Keg) (B=Keg->Bottle)
7/26: Flower Power(P) 6/13: Rolling Rock (K), 6/09: Yooper's Pale Ale (K), 5/27: Columbus IPA (K), 5/17: Victory Hop Devil (K), 5/15: Summit MO SMASH (K), 5/12: Sierra Nevada Celebration (K), 5/03: Schwartzbeir (B) 4/10: Birch Beer (Soda) (K), 3/31: Sierra Nevada Pale Ale (B), 3/25: Belgian Ale (SWMBO slayer) (B), 3/21: mrbowenz English IPA (B), 3/17: Mirror Pond Ale (K), 3/17: Blue Moon's "Old Country Cousin" (B), 3/15: Sculpin IPA (B),

copyright1997 is offline
 
Reply With Quote
Old 01-12-2012, 10:36 PM   #3
sjbeerman
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2011
Location: San Jose, CA
Posts: 305
Liked 5 Times on 5 Posts
Likes Given: 2

Default

inside the vessel...
__________________
Primary: Belgian Dark Strong
Secondary: EMPTY
Bottled: Belgian Saison Noel, Chocolate Porter, Raspberry Wheat
sjbeerman is offline
 
Reply With Quote
Old 01-13-2012, 03:19 AM   #4
AbeLincoln
Feedback Score: 0 reviews
Recipes 
 
Join Date: Oct 2010
Location: New England
Posts: 38
Liked 5 Times on 2 Posts

Default

>.< Thanks

Is there an easy/cheap modification I can do to my brewing bucket to keep an eye on wort temperature?
AbeLincoln is offline
 
Reply With Quote
Old 01-13-2012, 12:50 PM   #5
bigljd
Feedback Score: 0 reviews
Recipes 
 
Join Date: Oct 2010
Location: Sacramento, CA
Posts: 472
Liked 23 Times on 18 Posts
Likes Given: 6

Default

Quote:
Originally Posted by AbeLincoln View Post
>.< Thanks

Is there an easy/cheap modification I can do to my brewing bucket to keep an eye on wort temperature?
Throw one of these on the side of your bucket,

http://www.amazon.com/Fermometer-Adh.../dp/B004B4TS1S


it will get you close enough to the inside temp. Most home brew shops sell them.
bigljd is offline
 
Reply With Quote
Old 01-13-2012, 01:02 PM   #6
Clementine
Feedback Score: 0 reviews
Recipes 
 
Join Date: May 2011
Location: Waynesboro, PA
Posts: 545
Liked 11 Times on 11 Posts
Likes Given: 3

Default

If you have spare stainless steel dip tube or small diameter tubing you can make a thermowell (or buy one) then drop your favorite temp probe in there to monitor what is going on. I just made mine x 2 one for a mash thermometer and one for fermenter.

Clem
Clementine is offline
 
Reply With Quote
Old 01-13-2012, 01:23 PM   #7
broadbill
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2007
Location: Southern Maine
Posts: 3,522
Liked 345 Times on 244 Posts
Likes Given: 260

Default

Quote:
Originally Posted by Clementine View Post
If you have spare stainless steel dip tube or small diameter tubing you can make a thermowell (or buy one) then drop your favorite temp probe in there to monitor what is going on. I just made mine x 2 one for a mash thermometer and one for fermenter.

Clem
I have also found that taping a probe to the side of the fermenter and then insulating with with bubble wrap is almost if accurate (if not just as accurate). Can't blame somebody for geeking out though!
broadbill is offline
 
Reply With Quote
Old 01-13-2012, 06:44 PM   #8
AbeLincoln
Feedback Score: 0 reviews
Recipes 
 
Join Date: Oct 2010
Location: New England
Posts: 38
Liked 5 Times on 2 Posts

Default

I've been using a stick-on liquid crystal thermometer, but I think I'm ready to begin probing the core temperature of my fermenting wort in order to achieve greater control over fermentation.

Here's my concern:

The specific heat of the high density polyethylene bucket fermenter is somewhere between 1.8 - 2.7 J/g.K (joules per grams Kelvin)* whereas the specific heat of the air in my fermenting room at 20 degrees Celsius is 1.005 J/g.K ** If the wort has a gravity of 1.05, its specific heat would be just above 4 J/g.K throughout the possible range of fermentation temperatures for my yeast (Safbrew T-58). ***

What this means is that while using the stick-on thermometer, I'm getting some measurement of the average kinetic energy between the air and bucket (which have greater thermal transfer potentials than wort [ie. lower specific heat]), and the fermenting wort.


Quote:
Originally Posted by Clementine View Post
If you have spare stainless steel dip tube or small diameter tubing you can make a thermowell (or buy one) then drop your favorite temp probe in there to monitor what is going on. I just made mine x 2 one for a mash thermometer and one for fermenter.

Clem
I like Clem's idea because it involves measuring the average kinetic energy between two substances and not three (provided one uses a steel temperature probe). Further, steel has a relatively low specific gravity (.5 J/g.K)**** and thus a better thermal transfer potential than both plastic and air. It should essentially suck the heat right out of the surrounding wort and give one a reading with a much more negligible deviation.

The thermowell has two apparent benefits then:
  1. Greater accuracy in temperature measurement
  2. Ability to measure core temperature of wort

I suppose I could drill another hole in my lid, stick a rubber lid grommet into it, then find or make a stainless steel thermowell of the appropriate diameter and length and be all set.

Any thoughts?

Thanks guys

* Material Properties of HDPE, Commodity Polymers | Polymers Data Sheets

**Air Properties

***Sugar - Specific Heat Capacity (SG to brix calculation necessary to use calculator)

****Metals - Specific Heats


AbeLincoln is offline
 
Reply With Quote
Reply


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fermentation Temperature MisterGreen Fermentation & Yeast 8 12-21-2010 07:36 PM
Fermentation temperature iansbrew Fermentation & Yeast 7 09-12-2010 02:12 AM
Fermentation temperature too hot? eon Fermentation & Yeast 2 12-20-2009 01:22 PM
Just what is the fermentation temperature....? Kershner_Ale Fermentation & Yeast 6 11-11-2009 07:00 PM
fermentation temperature 400d Fermentation & Yeast 5 09-24-2009 04:57 PM


Forum Jump

Newest Threads

LATEST SPONSOR DEALS