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Old 03-12-2016, 05:59 PM   #21
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That was really helpful, not least because it dealt with the problems I've had in coming back to brewing after over 30 years and trying to set it up to work in the greenhouse. I'd taken the more brutal approach of cutting a hole in the lid of the FV and dangling the heater down the middle. My reasoning was that this would give effective heating throughout the brewing liquid. How does it work with the water bath? Is the temperature even, or is it warm near the heater and much cooler opposite it?
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Old 03-12-2016, 06:43 PM   #22
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How does it work with the water bath? Is the temperature even, or is it warm near the heater and much cooler opposite it?
From memory whenever I've taken temperature readings across the water bath at different points the difference is usually no more than about 0.5*C. What I can't do however is test the difference from top to bottom of the bath.
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Old 03-12-2016, 07:22 PM   #23
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From memory whenever I've taken temperature readings across the water bath at different points the difference is usually no more than about 0.5*C. What I can't do however is test the difference from top to bottom of the bath.
Aquariums must have a pretty even temperature despite having heaters just stuck in one corner. However, I find it difficult to understand how this happens because when topping up a bath, it's necessary to swish the water round to get it from the tap end to the other end. The answer must be that with steady heating, the convection currents are sufficient to evenly dissipate the heat.
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Old 04-12-2016, 12:00 AM   #24
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The answer must be that with steady heating, the convection currents are sufficient to evenly dissipate the heat.
That's how I read it, probably because the fairly narrow water bath annulus (certainly in my set-up) is conducive to convection currents being formed.
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Old 04-12-2016, 08:52 PM   #25
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Hi!
If anyone's worried about uneven temperature in a water bath, there's always one of these:
http://www.ebay.co.uk/itm/Ultra-Quie...3D322264560286
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Old 04-12-2016, 10:03 PM   #26
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Hi!
If anyone's worried about uneven temperature in a water bath, there's always one of these:
http://www.ebay.co.uk/itm/Ultra-Quie...3D322264560286
Well I'm certainly not 'worried' about an apparent temperature difference of <0.5*C across my water bath.
It's got an FV with beer in it, not a nuclear reactor!
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Old 05-12-2016, 04:52 AM   #27
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Well I'm certainly not 'worried' about an apparent temperature difference of <0.5*C across my water bath.
It's got an FV with beer in it, not a nuclear reactor!
Hi!
What a put down!
I knew that you wouldn't be worried with such a low temp difference; I posted for the benefit of anyone who was worried.
I've read posts about brewers who have recorded a large vertical temperature difference in their water bath - this may happen if the setup involves a large volume of water in the bath. A cheap submersible pump solved their problem.
I suppose it's the same situation with having or not having a circulationg fan in a brewfridge.
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Old 05-12-2016, 09:46 AM   #28
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The water bath idea is very low tech; you have only got to look at my set-up in the OP to see that. The fish tank heater itself relies on a fairly crude thermostat and that in itself introduces a small working temperature variation local to the heater let alone elsewhere. In my opinion therefore, by its very nature, there is no need for any extra bells and whistles. You can't polish a ****!
However, it does allow homebrewers to maintain fermenting temperatures with reasonable accuracy in a 'simple, cheap and effective' manner when otherwise they are unable to do that for space or background temperature reasons.
So anyone who is fastidious about maintaining brewing temperature control to very fine margins, should be probably be looking at other more sophisticated methods.
However I am sure that for many like me it does the job it is intended to do.
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Old 05-12-2016, 10:55 AM   #29
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Hi!
I stand corrected. In future, I'll refrain from sticking my nose in where it's not wanted.
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Old 23-01-2017, 09:00 PM   #30
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Great Idea Thanks
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