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Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > calculating efficiency?
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Old 10-14-2011, 01:34 PM   #1
Gustavo
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Default calculating efficiency?

MASH INGREDIENTS
-- 7 lbs. Rahr 2-Row Pale 36
-- 0.75 lbs. Gambrinus Honey Malt 30
-- 0.25 lbs. Belgian Biscuit malt 35

(7X36)+(.75X30)+(.25X35)
252+7.5+26.25=285.75

286/7 wort pre boil?
40.8
1.041og I got a 1.032
32/41
so my efficiency is
78?


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Old 10-14-2011, 02:27 PM   #2
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Quote:
Originally Posted by Gustavo
MASH INGREDIENTS
-- 7 lbs. Rahr 2-Row Pale 36
-- 0.75 lbs. Gambrinus Honey Malt 30
-- 0.25 lbs. Belgian Biscuit malt 35

(7X36)+(.75X30)+(.25X35)
252+7.5+26.25=285.75

286/7 wort pre boil?
40.8
1.041og I got a 1.032
32/41
so my efficiency is
78?
What is your batch size? 7 gallons? Or is that your pre boil volume?


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Old 10-14-2011, 02:51 PM   #3
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Quick question. Is the 1032 measurement temperature adjusted? Hydrometer or refractometer?
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Old 10-14-2011, 02:56 PM   #4
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According to here
http://www.brewersfriend.com/brewhouse-efficiency/
you have 75.8% or so.
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Old 10-14-2011, 03:08 PM   #5
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That would be your mash/lauter efficiency. You will probably lose a little bit to trub, dead space, hop absorption etc on the way to the fermenter (I lose about 5%). You could repeat the calculation using your OG and volume in the fermenter to get your brewhouse efficiency.

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Old 10-14-2011, 03:24 PM   #6
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I'm having a migraine getting these numbers to make sense. The link you gave to the Brewersfriend calculator says "Brewhouse Efficiency", but isn't it calculating lauter efficiency (given the pre-boil volume/OG data)? From what I can tell, mash, lauter and brewhouse numbers are all calculated differently, and there doesn't seem to be a consensus on what the gold standard is. Well, brewhouse is easy enough, but I'm confused about the mash/lauter numbers.

Here's my example:
3.75lb Pilsner
2lb Light Munich
0.25lb Carapils
0.25lb Crystal 60L
0.25lb Victory

4.1 gallons pre-boil volume
OG 1.046 (temp corrected)

3.3 gallons post-boil volume
OG 1.052 (temp corrected)

Brewersfriend says I have 78% "Brewhouse" efficiency (I assume it's calculating lauter efficiency, may be wrong there), and Beersmith says I have 73% brewhouse efficiency based on the wort in fermenter. If I plug the post-boil numbers into Brewersfriend (as ajf said), I get 71% brewhouse efficiency. Not like it's a huge deal, the system makes great beers, but you kind of have to understand exactly what you're getting before you can make improvements on the mash side.
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Old 10-14-2011, 03:36 PM   #7
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I normally just track the mash efficiency (the numbers you got in your original post). This is basically the measure of how much fermentable sugar you extracted from the grain. Brewhouse efficiency accounts for other factors including loss to trub, equipment, thermal expansion, etc.

All I really care about is if my mashing process is resulting is the highest consistent sugar extraction possible with my system.

YMMV
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Old 10-14-2011, 11:44 PM   #8
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Yes pre boil. And my gravity reading was post boil
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Old 10-14-2011, 11:55 PM   #9
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Reading was taken by a hydrometer. And no I dis not temp adj. O dis check on the calc. And I believe it was 1.034
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Old 10-15-2011, 12:22 AM   #10
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Sorry damn spell check on iPhone , lol. Was typing to fast, well actually I just doubled check the temp adj. And it was about 1.036


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