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Old 01-31-2012, 06:20 PM   #11
D_Nyholm
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I'm confused on efficiency here and i bet others are too. THis is what I brewed last night and i'm trying to figure out what might have happened.

6.5 lbs. 2-row
.375 lbs amber malt

After the mashout, i had 4 gallons of wort and a gravity of 1.055 which shows a 87% efficiency

After the 60 minute boil, i had 2.5 gallons an a gravity of 1.076 which shows an efficiency of 75%.

What efficiency is correct? Why would it change so much just from a boil?

 
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Old 01-31-2012, 08:04 PM   #12
zeekage
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Quote:
Originally Posted by D_Nyholm View Post
I'm confused on efficiency here and i bet others are too. THis is what I brewed last night and i'm trying to figure out what might have happened.

6.5 lbs. 2-row
.375 lbs amber malt

After the mashout, i had 4 gallons of wort and a gravity of 1.055 which shows a 87% efficiency

After the 60 minute boil, i had 2.5 gallons an a gravity of 1.076 which shows an efficiency of 75%.

What efficiency is correct? Why would it change so much just from a boil?
Something doesnt add up. Unless there were losses when you transfered between the two measurements. If all you did was boil 4 gallons of 1.055 wort down to 2.5 gallons then you should have 2.5 gallons of 1.088 wort (55 * 4)/2.5 = 88 Since sugar is not lost in the boil. So maybe one of the gravity readings are not corrected for temperature? Or there were some losses somewhere? Or when you measured pre-boil the wort wasn't mixed properly? Or the volume measurement of one of the readings is off?

 
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Old 01-31-2012, 08:40 PM   #13
D_Nyholm
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Originally Posted by zeekage View Post
Something doesnt add up. Unless there were losses when you transfered between the two measurements. If all you did was boil 4 gallons of 1.055 wort down to 2.5 gallons then you should have 2.5 gallons of 1.088 wort (55 * 4)/2.5 = 88 Since sugar is not lost in the boil. So maybe one of the gravity readings are not corrected for temperature? Or there were some losses somewhere? Or when you measured pre-boil the wort wasn't mixed properly? Or the volume measurement of one of the readings is off?
Yup, I'm still learning. I added 4 gallons to the pot, then BIAB, then too gravity after mashout. There definitely was not 4 gallons still in there...

At least I got the efficiency calc right, now I just have to learn how to plug in the right numbers!

 
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Old 01-31-2012, 08:46 PM   #14
zeekage
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Quote:
Originally Posted by D_Nyholm View Post
Yup, I'm still learning. I added 4 gallons to the pot, then BIAB, then too gravity after mashout. There definitely was not 4 gallons still in there...

At least I got the efficiency calc right, now I just have to learn how to plug in the right numbers!
Ah, you didn't account for grain absorption. I believe it's usually a pint/lb of grain. so for your grain bill thats .85 gallons lost there. Which would give you an estimated 3.15 gallons of 1.055 wort not 4. That will make the numbers a bit closer for sure. Take an actual volume measurement pre boil if you want to know pre boil efficiency. In your case, the actual efficiency would be your post boil one. So the 75%

 
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Old 02-26-2012, 02:19 AM   #15
sfrisby
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What is the significance of pre-boil gravity? I have been more focused on post boil, as that is what is going into the fermenter.

 
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Old 02-26-2012, 05:10 AM   #16
Hermit
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What is the significance of pre-boil gravity? I have been more focused on post boil, as that is what is going into the fermenter.
Pre-boil gives you a chance to adjust your hops if you are off or you can add DME or water to compensate.

 
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Old 02-26-2012, 12:21 PM   #17
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That makes a lot of sense. I should start paying more attention to that.

 
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