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Home Brew Forums > Home Brewing Beer > DIY Projects > Fermenters > Conical Fermenter Chiller/Heater Build
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Old 12-09-2012, 10:01 PM   #31
JasonO
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I've been wiring up everything this afternoon. I'll be doing a dry run on a keg full of water tonight.

Rough wiring


Slowly getting there


-Jason


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Old 12-09-2012, 10:46 PM   #32
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So what sort of control loop are you thinking about. I think just plain time based boundary control would be sufficient.


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Old 12-09-2012, 11:25 PM   #33
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Starting the testing now. Basement is currently 68 degrees, set the temp to 72. I should have some nice numbers on the chart shortly.

BrewGeek_Ohio, as for control I can set things on the arduino at the moment and I have a .5 degree buffer from the set temp between the heater and chiller running. I also have a compressor timeout in the code. I'm guessing this will need some tweaking as I collect data.



-Jason
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Old 12-10-2012, 04:50 AM   #34
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Slowly editing the heating and chilling settings to hold a steady temp. Almost there.



-Jason
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Old 12-10-2012, 10:29 AM   #35
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Quote:
Originally Posted by JasonO
Starting the testing now. Basement is currently 68 degrees, set the temp to 72. I should have some nice numbers on the chart shortly.

BrewGeek_Ohio, as for control I can set things on the arduino at the moment and I have a .5 degree buffer from the set temp between the heater and chiller running. I also have a compressor timeout in the code. I'm guessing this will need some tweaking as I collect data.

-Jason
I wonder what the temp swing limitation really needs to be. I'm sure +/- 1 degree is plenty tight. It would be nice to get the definitive answer from the yeast supplier. Sounds like a mission, I may just start asking that question to them today.
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Old 12-10-2012, 12:34 PM   #36
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Ales: 62F 75F (17C 24C)
Lagers: 46F 58F (8C 14C) *Note: Lager fermentations can be started warmer (~60F, 15.5C) until signs of fermentation (gravity drop, CO2 production, head formation) are evident. Cool to desired fermentation temperature once signs of fermentation are observed.
Wheat and Belgian styles: 62F 85F (17C 29C)

Got this from wyeast, Seems like a very broad spectrum. Pick a middle point, calculate a high and low standard deviation and bobs your uncle you got a perfect fermentation!

With a temp swing like this i can see a +/- 3 degF is a nice and tight control.
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Old 12-10-2012, 02:38 PM   #37
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So my plan is + or - 1 degree but for testing right now I'm seeing how tight i can make it without cycling too much. This week I'll be setting up the server side piece to host the temp the arduino should be set to. It will be really cool to be able to pitch @ 64 degrees then bring things up to 68 then cold crash when complete. Also I'm going to see how far down I can keep the fermenter. Being able to lager would be really cool.

-Jason
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Old 12-10-2012, 03:29 PM   #38
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That's my concern also, cycling. A good insulation will be magic!
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Old 12-12-2012, 04:19 PM   #39
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Getting closer on the control. Yesterdays changes fixed both cycles fighting, the last thing I am going to do is all a relay to the pump to turn it off in between cycles. That should stretch the time between cycles.

Last night I set things much lower and it pulled down correctly. This morning I set things higher and it worked well too. In real world use I would not be going this crazy but I now know I can pull the fermenter down to a lower temp easily for pitching yeast or possible lagering.




-Jason
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Old 12-12-2012, 04:43 PM   #40
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Pretty damn sweet!


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