HOMEBREW Digest #6099 Thu 07 August 2014

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  Re:Trouble controlling fermentation temperature (kmorgan1)
  Re: Problem controlling fermentation temperature (Fred L Johnson)
  Problem Controlling Fermentation Temp (Ian & Jean Ramsay)

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---------------------------------------------------------------------- Date: Thu, 07 Aug 2014 05:57:26 -0400 From: kmorgan1 at localnet.com Subject: Re:Trouble controlling fermentation temperature Alejandro, you may want to try throttling the flow of glycol to cool more slowly. Return to table of contents
Date: Thu, 7 Aug 2014 06:51:56 -0400 From: Fred L Johnson <FLJohnson52 at nc.rr.com> Subject: Re: Problem controlling fermentation temperature Alejandro is having trouble controlling his fermentation temperature in a 100 gallon conical, glycol jacketed fermentor. Alejandro is experiencing substantial hysteresis in his temperatures relative to the controller settings. I have no experience with such volumes, but it seems the community could use a little more information before we can help. My first thought is to reduce the differential from 3 degrees to 1 degree. This would certainly reduce the hysteresis. It would help us to know where the temperature probe is located, and I think it would also help to know the temperature gradient within the fermentor from center to wall and top to bottom. It seems that minimizing the differential on the controller and optimizing the placement of the probe would be most straightforward approach to this. Surely the small commercial brewers have a standard workaround to this common issue. Fred L Johnson Apex, North Carolina, USA Return to table of contents
Date: Fri, 08 Aug 2014 11:55:38 +1200 From: Ian & Jean Ramsay <ian.ramsay at clear.net.nz> Subject: Problem Controlling Fermentation Temp Alejandro As I see it you have multiple problems. First your 3 degrees differential is too high, and let's assume your temp probe is in the middle of the fermenter. The fermenting wort close to the walls cools fast unlike the middle. Even when the ferment is rapid it will overshoot your required temp. Some thoughts for you. 1. Reduce your differential say to 1 degree. 2. Restrict the output of your glycol pump to slow the cooling rate. Reducing the differential will mean your cooling pump will run more often, but for a shorter time. A timer will cause you grief when you need to crash the ferment at the end. You will need to experiment to get your system tuned to your needs. I would play with your differential first, keep reducing it and this may be all you need to do. Ian - --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com Return to table of contents
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