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Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > BIAB Brewing > Recirculating BIAB Mash with Propane
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Old 11-09-2013, 09:08 PM   #11
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Passive insulation does wonders. My next effort is to try and add much, much more insulation on the mash-and-boil vessel. That is easier with electric heat.

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Old 11-10-2013, 04:28 AM   #12
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Very cool tob, so your device essentially reads the temp of the liquid, and physically adjusts the actuator on your burner to either lower or raise the gas based on that reading?
Yes, I'm using a PID algorithm to adjust the burner in order to maintain the temperature.

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But that also means gas is on the whole time during the mash - right? Or do you have a pilot system so that when gas is at 0% a flame can automatically be re-established when the reading drops below the threshold?
The temperature control works the best if the burner is on during the whole mash, but I have to leave the top off of my keggle so that the temperature doesn't continuously rise. I do not have a pilot on my burner, but I do have an electric spark module form a gas range that is used to automatically ignite the burner. I have programmed a minimum propane valve position so that the burner stays lit, and the burner automatically gets shut off if the temperature gets 0.5 deg F greater than the desired temperature. The burner will automatically relight itself when the temperature drops back down to the setpoint if it had been shut off.
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Old 11-11-2013, 03:33 AM   #13
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Hey Tob77, thanks for the shout out
What are you using to attach the servo to the valve, shapelok ?

To the OP, have you thought about automatically stirring rather than recirculating? Is there some advantage to recirculating? I found during my first foray into BIAB that the mash was so thin, stirring was a real option.

Just a thought ...

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Old 11-11-2013, 05:07 AM   #14
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Hey Tob77, thanks for the shout out
What are you using to attach the servo to the valve, shapelok ?

To the OP, have you thought about automatically stirring rather than recirculating? Is there some advantage to recirculating? I found during my first foray into BIAB that the mash was so thin, stirring was a real option.

Just a thought ...
I used InstaMorph which is a generic form of shapelok that I found on Amazon. Thanks again for the idea and inspiration

I think that a well mixed mash is very important any time that you are adding heat. I arranged the output of my pump in a whirlpool like position to obtain the best possible mixing. I think that an auto mixer could work even better than recirculation as long as you did it in a way that didn't tangle up the bag.
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Old 11-11-2013, 05:30 AM   #15
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To the OP, have you thought about automatically stirring rather than recirculating? Is there some advantage to recirculating? I found during my first foray into BIAB that the mash was so thin, stirring was a real option.

Just a thought ...
It's a good suggestion. I haven't explored automated stirring, might give that some thought as well. I have a nice bag fitted to my pot depth and diameter, so I wouldn't be concerned too much with it getting caught in a mixer of some sort.
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Old 11-21-2013, 10:35 PM   #16
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No offense to your technical solution as I considered one too. But I ended up going a KISS route to maintaining mash temps that works well for me:

After heating to 1-2 degrees above strike temp, I turn off the burner, insert my basket/bag, put the lid on, and wrap my kettle in a jacket I made of 4 layers of Reflectix BP24025 insulation. I also made a lid cover from 4 layers of Reflectix too. My lid also has 2 small holes in it; one for my mash (potato masher style) paddle and another for my remote thermoworks thermometer. I let the heated water and basket become isothermal for a few minutes, then remove the lid and it's insulation and mash-in. I replace the lid/insulation with my mash paddle sticking through the hole in the lid and begin the mash. I stir periodically during the mash without lifting the lid. With this setup, I'm able to maintain my mash temps within 1-2 degrees F over 90 minutes in a 50 degree garage without a problem. Setup and cleanup are easy too.

Just a thought.
SteveO

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Old 01-02-2014, 06:45 PM   #17
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I finally got around to posting some more details and source code for my setup in the automated brewing forum.
http://www.homebrewtalk.com/f235/ras...roller-451059/

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Old 01-06-2014, 06:50 PM   #18
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edit: removing

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Reason: posted on the wrong thread
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Old 02-16-2014, 04:17 PM   #19
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Default RE: "stabilize my mash temperatures for improved brew repeatability"

RE: “would love to add a tower of power controller, RIMS tube, an element or a control panel to my setup, but it just isn't in the budget unfortunately - and I can't find any low-priced alternatives. …”

The 72,000BTU output burner quickly heats the water to temperature for strike and boil. However, the same high-energy output makes it a bit difficult to subsequently precisely control the mash temperature on intermittent low heat, and also requires “minding the pot”. Like you, the automatic intermittent propane ignition, “isn't in the budget”; and also seems not the optimal tool to be left unattended.

Thus this modified application of HERMS for mash temperature control was undertaken to avoid the potential disadvantages of the RIMS-tube heating element directly contacting the wort. Recently posted here (Shiny bright stainless steel: pictures + brewery video):
http://www.homebrewtalk.com/f244/bia...-build-458429/

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