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Old 01-18-2013, 03:23 PM   #1
alestateyall
 
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iBrewmaster does not have a built in method for calculating strike temps and water volumes for no sparge BIAB. I decided to document my work around.

First, I created a no BIAB mash profile. The following pictures show the details. PS. The pictures show grain absorption of 0.1G/lb. I find 0.05G/lb is more realistic.

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Next, back in my recipe I created a "BIAB No Sparge" infusion mash step. The details of that mash step are shown in the picture below. The step is set to auto calculate the strike temperature based upon a user provided volume of water. I insert the "BIAB No Sparge" with a place holder water volume of 10 quarts.

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Next, I insert a batch sparge step. This step auto calculates the remaining water volume needed to hit my target pre-boil volume based on the grain absorption, boil loss, batch size, etc from my BIAB mash profile.

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At this point I have two mash steps in the recipe as shown below.
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Next, I add the calculated volume from the batch sparge step to the 10 quart place holder used in the "BIAB no sparge" step.

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Old 01-18-2013, 03:24 PM   #2
alestateyall
 
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This causes the volume calculated on the batch sparge step to drop to 0 quarts.

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Finally, I erase the batch sparge step and I have the correct water volume and strike temperature using my mash profile values (grain absorption, boil loss, etc).

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I have used this on brew day and it works well. My only problems so far are predicting the grain absorption rate. I squeeze the bag so there is not much absorption.

 
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Old 01-21-2013, 06:39 PM   #3
241
 
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Way to go on starting the iBrewmaster BIAB conversation. There is very little info out there for those of us that use the two.

As for this process, going to try to dial mine in a little more using your method. Thanks!
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Old 01-21-2013, 07:14 PM   #4
FlyDoctor
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Super - I BIAB no sparge as well and have to use another program to figure out volumes etc. Its weird that they don't have that function in there. I recommended it through the program a while back but no action.

Now, am I the only one who thinks using quarts for this purpose is difficult? My sightglass reads out gallons - and perhaps it is I that needs to adjust, but seems like I always have to retro calculate how many gallons the given # quarts should be.

 
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Old 01-21-2013, 07:23 PM   #5
241
 
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Quote:
Originally Posted by FlyDoctor View Post
Super - I BIAB no sparge as well and have to use another program to figure out volumes etc. Its weird that they don't have that function in there. I recommended it through the program a while back but no action.

Now, am I the only one who thinks using quarts for this purpose is difficult? My sightglass reads out gallons - and perhaps it is I that needs to adjust, but seems like I always have to retro calculate how many gallons the given # quarts should be.
Agreed. I'd like to see it configurable (qt gallon etc.)

I think it's time we recommend a more BIAB friendly mash step for the next version
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Old 01-22-2013, 03:35 AM   #6
alestateyall
 
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I have always hated the quarts. I have dip stick marked with 0.1 gallon increments. I would much prefer to have gallons so I don't have to multiply by 4.

 
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Old 02-02-2013, 09:06 PM   #7
241
 
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Just reporting back, using this method with a .05 gal/lb absorption rate and .25 gal trub loss I hit my batch size water volume on the dot. Very pleased with the results and netted about a 75% efficiency on a BIAB pale ale.
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Old 02-02-2013, 10:09 PM   #8
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Nice. Glad it worked for you.

 
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Old 02-19-2013, 07:58 PM   #9
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Hey thanks for the info! Much props! I hope to try to this with my next BIAB.

 
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Old 02-19-2013, 09:08 PM   #10
Raven1469
 
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One question actually. When I input my data into iBrewmaster following your directions, My mash temp stays the same as yours(154 F) But it says to add 31 quarts of water at 156 F. I see that yours is 161 F. How did that work?

Edit:
Never mind, I answered my own question while playing around with it.

 
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