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Old 01-22-2014, 05:17 AM   #1
BoyleHopper
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Default First all Grain..need help understanding my efficiency

Hello all,

I just brewed my first All Grain; I am using brew smith 2.0 and brewed a kolsch style with a recipe assuming 72% brewhouse efficiency. After the brew I plugged in the numbers to brew smith which stated that estimated pre boil gravity would be 1.032; I got 1.038 and brew smith states that my measured mash efficiency is 84.3%. So when I change my brewhouse efficiency to 84.3% my est. pre boil gravity and my measured pre boil gravity are equal at 1.038. However, when I go into the fermentation tab and enter my measured OG of 1.051 and it compares it to the Estimated OG of 1.053 based on the updated brewhouse efficiency, my measured efficiency is 81.3%.

My question is... Why did I get an OG of 1.051 when it should have been 1.053 at a brewhouse efficacy of 84.3? Yet at that efficiency I hit my pre boil gravity of 1.038?

thanks in advance to anyone that can help explain this.

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Old 01-22-2014, 01:12 PM   #2
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... So when I change my brewhouse efficiency to 84.3% my est. pre boil gravity and my measured pre boil gravity are equal at 1.038. ....
When you changed the efficiency on your recipe it recalculated all the estimated values for o.g. and f.g. using the new efficiency model.

Change it back to what it was, but use the calculated one for your next recipe.
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Old 01-22-2014, 03:37 PM   #3
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Mash and brew house efficiency are two different things.

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Old 01-22-2014, 05:28 PM   #4
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Mash and brew house efficiency are two different things.
Ok so I understand that now. So i guess my question now is...What are some FACTORS that may have prevented me from attaining my estimated OG of 1.053 (I got 1.051), when i was able to attain my est pre boil gravity of 1.038?
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Old 01-22-2014, 06:00 PM   #5
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Maybe a little longer boil time to drive out some more water and increase the ratio of sugars would help, but if you only missed it by two points I definitely wouldn't worry much. I've been off as much as ten points which will piss you off. Tends to only happen when I try to push above 1.060 and do bigger beers.

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Old 01-22-2014, 06:14 PM   #6
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Maybe a little longer boil time to drive out some more water and increase the ratio of sugars would help, but if you only missed it by two points I definitely wouldn't worry much. I've been off as much as ten points which will piss you off. Tends to only happen when I try to push above 1.060 and do bigger beers.

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I have to agree with this, you're probably looking at a boil-off issue. At 2 points though, I'd call it a day and be fine with it.
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Old 01-22-2014, 06:14 PM   #7
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Definately your boil rate. The design and size of your kettle and the amount of heat all can factor how much you boil off. You want your boil to be a rolling boil. In other words as big a boil as you can make it without boiling over. I never concern myself with the pre boil gravity. We always do a 90 minute boil at the same rate of boil, starting from the same volume in the kettle. When all things are equal we nail our OG every time.

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Old 01-22-2014, 09:09 PM   #8
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Definately your boil rate. The design and size of your kettle and the amount of heat all can factor how much you boil off. You want your boil to be a rolling boil. In other words as big a boil as you can make it without boiling over. I never concern myself with the pre boil gravity. We always do a 90 minute boil at the same rate of boil, starting from the same volume in the kettle. When all things are equal we nail our OG every time.
I think this really nails it on the head.

Now that I have done a few batches I have all my numbers dial in pretty well. I tracked my pre-boil volume, gravity post boil volume and gravity and after a few time I was able to set the efficiency in beer smith so I hit my numbers nearly every time now (+/- .01).
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Old 01-22-2014, 10:43 PM   #9
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I would not recommend changing your brewhouse efficiency setting until you do several batches and figure out what you are getting for brewhouse.
72% is a basic default for BS and a great place to start.

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