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Old 12-04-2007, 08:56 PM   #1
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Default Need help with first AG efficiency

So I did it today in the 25F wind chill and all and all things went well. I was waiting for something to go wrong and nothing did...until racking into the fermenter. My pre-boil volume was 6.55 gallons and I was hoping for 5.5 gallons into the fermenter. I ended up with 3.75 in the fermenter! How could that much have been evaporated/absorbed?!? I only used 3oz of hops and my boil time was about 70 minutes. I mean the steam was coming off like crazy since its was frigid most of the time, but that much boil off?!? I ended up topping-up with another gallon of spring water...

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Old 12-04-2007, 09:38 PM   #2
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If I understand everything I just read after a google search (its iffy at best) air temp will effect your evaporation rate.

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Old 12-04-2007, 10:45 PM   #3
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Turns out my efficiency was 42%

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Old 12-04-2007, 10:49 PM   #4
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Ouch........................optimist kicking in............it can only get better.

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Old 12-04-2007, 10:49 PM   #5
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Quote:
Originally Posted by GaryA
Ouch........................optimist kicking in............it can only get better.
Yeah I don't get it. When partial mashing I never had that low efficiency. It won't even be drinkable since the IBUs are 70 and the OG is 1.049. That's just not good...Help!
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Last edited by Soulive; 12-04-2007 at 10:52 PM.
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Old 12-04-2007, 10:52 PM   #6
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Well with partials you would get extra sugars from your extracts. Guessing you didn't put any extract in this one.

Post up the recipe and temps so those with more AG experience can help out.

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Old 12-04-2007, 10:54 PM   #7
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Quote:
Originally Posted by GaryA
Well with partials you would get extra sugars from your extracts. Guessing you didn't put any extract in this one.

Post up the recipe and temps so those with more AG experience can help out.
Its EdWort's HPA recipe to the tee. My mash temps were 153F and I sparged at 167F. I know partial-mashing involves the extract but I still was still able to fullfill the grain fermentables. My mashing just really sucked and I don't understand goign from 6.5 gallons to 3.5 in about an hour fifteen
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Last edited by Soulive; 12-04-2007 at 11:00 PM.
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Old 12-04-2007, 11:30 PM   #8
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The O.G. of that 3.5 gallons has to be pretty high since you boiled off 3 gallons. I would add some spring water and pitch the yeast.

What is the O.G of your post boil wort?

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Old 12-04-2007, 11:32 PM   #9
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Quote:
Originally Posted by EdWort
The O.G. of that 3.5 gallons has to be pretty high since you boiled off 3 gallons. I would add some spring water and pitch the yeast.

What is the O.G of your post boil wort?
The 3.5 gallons were at 1.049 before the water. I really really don't know what happened here
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Old 12-04-2007, 11:56 PM   #10
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Alright, deep breath...

I can't believe you brewed today with the wind.. gusts of 40mph. Brave! I suspect that wind adds a lot to boiloff.

Did you leave any wort behind in the kettle at all? You used my keggle right so did you maybe forget to add hose to the output in order to pull a siphon to get all the wort out? I can't imagine a 3 gallon boil off in only 75 minutes.

You know what though, boiloff really has nothing to do with efficiency. Even if you boil off an extra gallon and then topup a gallon, your efficiency numbers would be the same (unless you left wort behind).

Also, did you accurately measure your runnings to know for sure how much you had preboil? Maybe you undersparged and only had 5/6 gallons?

Did you break the batch sparge into two smaller infusions or did you do one large one?

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