New Giveaway - Wort Monster Conical Fermenter!

Home Brew Forums > Home Brewing Beer > Equipment/Sanitation > holding temp with temp control




Reply
 
LinkBack Thread Tools Display Modes
Old 10-22-2007, 07:12 PM   #1
roofman70
Feedback Score: 0 reviews
Recipes 
 
Join Date: Oct 2007
Location: Downriver, Michigan
Posts: 74
Default holding temp with temp control

has anyone been able to hold temp to an exact degree with a mini fridge and a temp control ?

if so how?



__________________
roofman70 is offline
 
Reply With Quote Quick reply to this message
Old 10-22-2007, 07:18 PM   #2
StewJo
Feedback Score: 0 reviews
 
StewJo's Avatar
Recipes 
 
Join Date: Feb 2006
Posts: 43
Default

Quote:
Originally Posted by roofman70
has anyone been able to hold temp to an exact degree with a mini fridge and a temp control ?

if so how?

Nothing is exact. Different parts of the fridge will be at different temperatures. The built-in thermostat on refridges is pretty poor, so most homebrewers will overide it with a temperature controller purchased from a HB supply (Ranco, Johnson, etc).

Every temperature controller works on a thermostat design, which has a high point where cooling turns on and a low point where cooling turns off. These have to be separated by a degree or two, to avoid rapidly switching on and off.


__________________
StewJo is offline
 
Reply With Quote Quick reply to this message
Old 10-22-2007, 07:23 PM   #3
david_42
Feedback Score: 0 reviews
 
david_42's Avatar
Recipes 
 
Join Date: Oct 2005
Location: Willamina & Oak Grove, Oregon, USA
Posts: 25,650
Liked 130 Times on 124 Posts

Default

My freezer-based kegger (Ranco controller) has ranged from 33.4F to 34.7F over the last month, according to the min/max monitor. I doubt any consumer system would do much better. By contrast, the fermentation cabinet (fridge with Ranco) is lucky to hold within a 3F range.

__________________

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 10-22-2007, 07:24 PM   #4
roofman70
Feedback Score: 0 reviews
Recipes 
 
Join Date: Oct 2007
Location: Downriver, Michigan
Posts: 74
Default

Yes i am using a ranco with a magic chef wine chiller .

set at 68 +-1 deg and liquid temp in 5 gallon carboy reads 73 degrees

__________________
roofman70 is offline
 
Reply With Quote Quick reply to this message
Old 10-22-2007, 07:43 PM   #5
Bobby_M
Vendor and Brewer
HBT_SPONSOR.png
Vendor Ads 
Feedback Score: 1 reviews
 
Bobby_M's Avatar
Recipes 
 
Join Date: Aug 2006
Location: Piscataway, NJ
Posts: 21,734
Liked 853 Times on 572 Posts
Likes Given: 26

Default

The problem is you probably have your controller's sensor in the air or in some water. The beer itself is generating heat as it ferments. Your controller has no idea this is happening. You have two options;

1. Get a thermowell so you can put your sensor IN the beer.
2. Tape the sensor to the side of the fermenter (second best but better than nothing).

__________________
BrewHardware.com
Sightglass, Refractometer, Ball Valve, Weldless bulkhead, Thermometer, Decals, Stainless Steel Fittings, Compression Fittings, Camlock Quick Disconnects, Scale, RIMS tube, Plate Chiller, Chugger Pump, Super Clear Silicone Tubing, and more!
Bobby_M is offline
 
Reply With Quote Quick reply to this message
Old 10-22-2007, 08:29 PM   #6
EdWort
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
EdWort's Avatar
Recipes 
 
Join Date: Jul 2006
Location: Bee Cave, Texas
Posts: 11,966
Liked 242 Times on 131 Posts
Likes Given: 7

Default

Quote:
Originally Posted by Bobby_M
2. Tape the sensor to the side of the fermenter (second best but better than nothing).
That's what I do and I get a 8 to 9 degree delta when fermentation is going.

This has worked well so far, till I get a thermowell and drill another hole in the bucket lid.
EdWort is offline
 
Reply With Quote Quick reply to this message
Old 10-22-2007, 08:49 PM   #7
roofman70
Feedback Score: 0 reviews
Recipes 
 
Join Date: Oct 2007
Location: Downriver, Michigan
Posts: 74
Default

ranco sensor is in the air. set at 68 degrees

have carboy full of water with meat thermometer through bung hole to read temp of water. reads 72 degrees

have fridge thermometer next to carboy. reads 64 degrees

have fish tank thermometer on carboy. reads 69 degrees

wich would you belive??

__________________
roofman70 is offline
 
Reply With Quote Quick reply to this message
Old 10-22-2007, 09:50 PM   #8
roofman70
Feedback Score: 0 reviews
Recipes 
 
Join Date: Oct 2007
Location: Downriver, Michigan
Posts: 74
Default

Quote:
Originally Posted by Bobby_M
The problem is you probably have your controller's sensor in the air or in some water. The beer itself is generating heat as it ferments. Your controller has no idea this is happening. You have two options;

1. Get a thermowell so you can put your sensor IN the beer.
2. Tape the sensor to the side of the fermenter (second best but better than nothing).

if the sensor is in the beer wouldnt the fridge run till beer temp comes down

if so then wouldnt the fridge temp be enough to bring beer temp down below where we want it
__________________
roofman70 is offline
 
Reply With Quote Quick reply to this message
Old 10-22-2007, 10:38 PM   #9
Bobby_M
Vendor and Brewer
HBT_SPONSOR.png
Vendor Ads 
Feedback Score: 1 reviews
 
Bobby_M's Avatar
Recipes 
 
Join Date: Aug 2006
Location: Piscataway, NJ
Posts: 21,734
Liked 853 Times on 572 Posts
Likes Given: 26

Default

I guess the question is, are you more concerned with the air temp inside the fridge or the temp of the beer in a particular carboy? If the beer (which matters most for fermentation control) then the sensor needs to be IN the wort.

__________________
BrewHardware.com
Sightglass, Refractometer, Ball Valve, Weldless bulkhead, Thermometer, Decals, Stainless Steel Fittings, Compression Fittings, Camlock Quick Disconnects, Scale, RIMS tube, Plate Chiller, Chugger Pump, Super Clear Silicone Tubing, and more!
Bobby_M is offline
 
Reply With Quote Quick reply to this message
Old 10-22-2007, 10:48 PM   #10
StewJo
Feedback Score: 0 reviews
 
StewJo's Avatar
Recipes 
 
Join Date: Feb 2006
Posts: 43
Default

You get a more accurate temp reading if the thermometer is in the beer. That doesn't mean its the optimal control.

I think roofman is right. If you have 5gal of beer at 70df, and the temp probe is in a thermowell, and the tyhermostat is set to cool until 68df, then the controller will run the fridge full steam until the beer is down to 68df. At which point the rest of the interior of the fridge will be really cold. This could cause you to undershoot the temperature, as well as waste a lot of electricity.



__________________

-------------------------------------------
Primary: American Wheat
Secondary: Liberty Clone
Drinking: Farm Ale, Red Ale, Stout

StewJo is offline
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options
Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Extgernal Temp Control - temp in Freezer? ipscman Equipment/Sanitation 6 12-13-2012 01:48 AM
trouble holding temp down with first dopple dantose Beginners Beer Brewing Forum 4 08-13-2009 11:58 PM
First Temp Control\Wit Beer - What temp? cootr_brn All Grain & Partial Mash Brewing 2 05-25-2009 09:47 PM
Holding bottles at cooler temp - effect on carbonation? mdwmonster Beginners Beer Brewing Forum 2 02-22-2009 03:31 PM
Holding Mash Temp for Small Beers KingBrianI All Grain & Partial Mash Brewing 8 12-31-2008 12:47 AM