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Old 02-28-2012, 12:16 AM   #1
zacster
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Default BIAB, why is my efficiency so high?

I know this is a problem you'd all like to have, but I'm new to this and don't understand what I'm doing different than everybody else that I get high efficiency.

My batch yesterday gave me an 89% efficiency according to Beersmith, and my prior batch was around the same in the end. I lift the grain out, let it drip into the pot, then squeeze out the last of it into another pot and pour it into the main kettle, then pour some wort over it and squeeze it out again. That's all I do. It doesn't sound all that different. I have the homebrew store grind it all extra fine. I stir the mash to get it mixed in, and stir when bringing the temp up to mash out.

What am I doing wrong or right?

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Old 02-28-2012, 12:26 AM   #2
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I'm curious how fine your crush was. I am also curious more about your process. Starting gravity, grain bill, mash temp & duration.. etc...

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Old 02-28-2012, 12:33 AM   #3
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Extra fine? Definitely your crush dude if I had to guess.

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Old 02-28-2012, 12:41 AM   #4
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Other than asking to go extra fine on the crush I don't know how "extra fine" it really is. Maybe that's it, but if it were that easy wouldn't we all be doing that?

I'm trying to figure out how to paste my recipe from Beersmith, nothing I'm trying gives me good formatting. I'm on a Mac if anybody has any advice.

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Old 02-28-2012, 12:51 AM   #5
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Your math is messed up, or your measurements. Or you are sparging.

Let's assume the following, and I think these are good assumptions:

  • 0.2 gallons per # of grain stays in the grain, lost because you don't sparge
  • 10# of grain for your 5 gallon batch
  • Boiloff = 1 gallon

So, you add 8 gallons of water, and get 6 gallons of wort at the end of the mash. You've lost 2/8 of your sugars, still trapped in grain.

The max efficiency in this case is 75%. I don't know how you would get around that.
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Old 02-28-2012, 01:55 AM   #6
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That's just a bad assumption. I added 7 gallons of water and ended up with 6.6 before the boil. That's a lot less loss. It didn't make sense to me as I expect to lose more. In fact I have more sitting in my primary 6.5 gallon carboy than will fit in my 5 gallon secondary.

I'm also not doing any math. Beersmith is doing it all. I'm just plugging the numbers in and following its method.

I'm just perplexed by the result.

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Old 02-28-2012, 03:14 AM   #7
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Quote:
Originally Posted by zacster View Post
That's just a bad assumption. I added 7 gallons of water and ended up with 6.6 before the boil. That's a lot less loss. It didn't make sense to me as I expect to lose more. In fact I have more sitting in my primary 6.5 gallon carboy than will fit in my 5 gallon secondary.

I'm also not doing any math. Beersmith is doing it all. I'm just plugging the numbers in and following its method.

I'm just perplexed by the result.
Just wondering, how do you take your water measurements?
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Old 02-28-2012, 03:29 AM   #8
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Quote:
Originally Posted by zacster View Post
That's just a bad assumption.
Perhaps. It comes from Ray Daniels, Design Great Beers.

[edit: now that I think about it (should have done that first), I usually lose about 2 gallons on a 10g batch, which in the example above would be 1g or 0.1g per # of grain]
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Old 02-28-2012, 03:53 AM   #9
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My measurements are by the sight glass on my Blichmann. Reasonably accurate as Blichmann generally knows what they are doing.

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Old 02-28-2012, 04:16 AM   #10
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Quote:
Originally Posted by passedpawn View Post
Perhaps. It comes from Ray Daniels, Design Great Beers.

[edit: now that I think about it (should have done that first), I usually lose about 2 gallons on a 10g batch, which in the example above would be 1g or 0.1g per # of grain]
If you're saying you lose that much on a 10lb BIAB batch, then I'd say squeeze it more! I only lose about .1 gal per lb of grain (if even that much), but I squeeze the heck outta the bag!
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