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-   -   efficiency question (http://www.homebrewtalk.com/f39/efficiency-question-463885/)

autonomist3k 03-07-2014 02:10 AM

efficiency question
I just got a mash efficiency of 78% which I'm pretty happy with.
but I got a brewhouse efficiency of 64.5% which seems low to me.
My OG was 5 pts lower than expected. I was calculating for 70% brewhouse efficiency. I batch sparge btw.

My question is, is 64.5% a decent over efficiency? what would you say is average?

Hemphill 03-07-2014 02:37 AM

Most recipes are built around 75%. If you came in 5 points under your og,chances are the 64% is closer than 78% for your efficiency.

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Hemphill 03-07-2014 02:41 AM

I batch sparge as well but split my sparge in half for two runnings. I usually run around 82% efficiency. So if I'm using someone else's recipe I come in a few points higher on my OG.

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autonomist3k 03-07-2014 02:50 AM

No, I'm saying that my MASH efficiency is 78%, so my mash isn't the culprit.
But my overall efficiency is 64%, so there's something wrong in my process other than my mash.

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autonomist3k 03-07-2014 02:52 AM

I'm thinking my boil off rate is the problem, but I'm just curious if 64% overall is bad for batch sparging.

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BBL_Brewer 03-07-2014 03:00 AM

Where are you getting the 64% from? Is that derived from how many gallons hit the fermentor? If that's the case, sounds like you have a lot of dead space in your kettle. Are you using whole hops or pellet? Whole hops absorb wort and will also lower your overall efficiency. Boil off should have no impact on your efficiency. You're not boiling off sugar, just water. Whether you have a higher OG (less water) or a lower OG (more water) the amount of sugar you extracted remains the same.

freisste 03-07-2014 03:01 AM

Boiloff shouldn't affect it because that doesn't affect sugar in the pot. Do you have dead space in the mash tun or somewhere else?

How large was your batch and what was expected? Keep in mind, if you get 6 gallons of 1.050 and you expected 5 of 1.060, you don't have an efficiency problem.

autonomist3k 03-07-2014 03:11 AM

I'm using beersmith which calculates brew house efficiency, it takes everything into account, mash efficiency, dead space in mash tun and kettle, and adding your measured OG effects it also.
I use pellet hops.
It's a 2.5 gallon batch, and I got the correct amount of wort.

I'm using my equipment that I use for 5 gallon batches, I bet the dead space effects the smaller batches more.

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autonomist3k 03-07-2014 03:13 AM

I was expecting 1.067 but got 1.062.

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BBL_Brewer 03-07-2014 03:19 AM

Ok. So are you saying that you had a calculated mash efficiency of 78% which should have given you an OG of 1.067 but you ended up with 1.062 instead?

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