BIAB efficiancy question - Home Brew Forums
Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > BIAB efficiancy question
Cool Brewing Giveaway - Supporting Membership Drive & Discount

Reply
 
Thread Tools
Old 05-16-2012, 09:30 PM   #1
AviatorTroy
Recipes 
 
Apr 2010
Cincinnati
Posts: 84
Liked 1 Times on 1 Posts



I'm thinking about simplifying and trying a no sparge batch next time around. I've been getting about 78% efficency with a batch sparge. How much should I need to boost my grain bill due to the slight efficiancy losses due to skipping the sparge? And do you just mash with your total water amount and not worry about the fact that it's going to be an extrememly thin mash?



 
Reply With Quote
Old 05-16-2012, 09:51 PM   #2
tre9er
Recipes 
 
Jan 2012
Lincoln, NE
Posts: 4,369
Liked 241 Times on 197 Posts


Yes, it's a full-volume mash. If you stir well and squeeze the bag intensely I think you can still get pretty good efficiency. Of course, it wouldn't hurt to have a gallon of sparge water handy to just pour over the bag while it's suspended from the BK.


__________________
_________________________________
Skal!
Den Faaborg Bryggeri

Quote:
Originally Posted by davekippen View Post
Open log Fermenting and gas-can secondary?? I am planning my next brew right now!!

 
Reply With Quote
Old 05-16-2012, 10:23 PM   #3
wilserbrewer
BIAB Expert Tailor
HBT_SPONSOR.png
 
wilserbrewer's Avatar
Recipes 
 
May 2007
Jersey Shore, Jersey
Posts: 9,213
Liked 1247 Times on 955 Posts


Basicly the difference will be the slight due to the higher levels of sugars that are left absorbed into the grain. As said above, squeezing will minimize this, but as a guess if you just drain the bag well, maybe a couple, three points, not much. I just let the bag drain well and call it good, I have attempted squeezing, but it can be messy and not worth it as I am brewing indoors. If you want to boost your grain bill by 3-5%, it should be a wash I'd imagine.

 
Reply With Quote
Old 05-16-2012, 10:36 PM   #4
wolfman_48442
Recipes 
 
Mar 2011
Fraser, MI
Posts: 531
Liked 12 Times on 12 Posts


I don't know if it's truly logrithmic, but it's certainly not a linear decline in efficiency as your OG increases.
A 1.050 wort may lose 3-5 points, a 1.075 beer might lose 15 points.

 
Reply With Quote
Old 05-17-2012, 01:19 AM   #5
stux
Recipes 
 
Sep 2011
Sydney, NSW
Posts: 94
Liked 3 Times on 3 Posts


Full volume BIAB efficiency is directly dependent on the liquor:grain ratio in the mash.

Not sure of the exact curve, but as your l:g ratio drops the mash gravity increase, and as the grain absorption remains constant (by weight) you lose relatively more sugars. This is basically a "lautering loss"

Think it's time I ran the numbers and made a chart
__________________
For in-depth BIAB info try http://biabrewer.info

neosapien Likes This 
Reply With Quote
Old 05-17-2012, 02:59 AM   #6
AviatorTroy
Recipes 
 
Apr 2010
Cincinnati
Posts: 84
Liked 1 Times on 1 Posts


Thanks, Im just going to have to try it out and see what i get, Ill start by boosting grains about 5%

 
Reply With Quote
Old 05-17-2012, 06:54 AM   #7
stux
Recipes 
 
Sep 2011
Sydney, NSW
Posts: 94
Liked 3 Times on 3 Posts


Quote:
Originally Posted by stux View Post
Full volume BIAB efficiency is directly dependent on the liquor:grain ratio in the mash.

Not sure of the exact curve, but as your l:g ratio drops the mash gravity increase, and as the grain absorption remains constant (by weight) you lose relatively more sugars. This is basically a "lautering loss"

Think it's time I ran the numbers and made a chart
I ran the numbers and made a chart

My discussion on this chart : http://www.biabrewer.info/viewtopic.php?f=74&t=1481

Basically, I've graphed the Lautering Loss as a percentage vs Liquor to Grain Ratio for four True Absorption values.

1.2 L/KG = BIAB Heavy Squeeze
1.3 L/KG = BIAB Medium Squeeze
1.4 L/KG = BIAB Light Squeeze
1.56 L/KG = Traditional Mash Tun

As modelled using my Conversion Efficiency formulas, which have been quite successful in modelling the BIAB process

This is for No Sparge. You can see why a sparge makes a big difference when the L:G is low.


Click image for larger version

Name:	Lauter Loss.jpg
Views:	186
Size:	19.6 KB
ID:	61621  
__________________
For in-depth BIAB info try http://biabrewer.info

 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Extremely high efficiancy mlarnold All Grain & Partial Mash Brewing 8 04-21-2011 01:24 PM
brewhouse efficiancy BrewsterT All Grain & Partial Mash Brewing 2 05-23-2010 09:01 PM
partial mash.OG,break material,mash tun efficiancy questions dzlater All Grain & Partial Mash Brewing 9 07-07-2008 12:15 AM
Crazy Efficiancy paulthenurse All Grain & Partial Mash Brewing 1 02-02-2008 01:31 AM
efficiancy and P.H. morbid53 All Grain & Partial Mash Brewing 4 03-31-2007 02:05 PM


Forum Jump