Ss Brewing Technologies Giveaway!

Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Grain Bill Hand Calc - Extraction% & Brewhouse%
Reply
 
LinkBack Thread Tools
Old 04-10-2012, 06:44 PM   #1
BrewWorm
HBT_SUPPORTER.png
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2011
Location: Fort Collins, CO
Posts: 41
Liked 1 Times on 1 Posts
Likes Given: 1

Default Grain Bill Hand Calc - Extraction% & Brewhouse%

I'm set on doing hand calculations for my grain bills (and hops for that matter) so I can really understand what's going on in my mash tun. When I get good consistent brews, then I'll switch to the software.

For now, I'm trying to get a firm handle on extraction percentages and brewhouse efficiency. Basically do you factor in the extraction percent into the overall brewhouse efficiency?

As I understand it now:
Extraction %: How much extract you can get from a unit of malt. This will vary from malt to malt, but is usually in the ~75 - 80% range, correct?

Brewhouse efficiency: How much of the sugars you can actually extract from the grain. Does this include the extraction % or is more just about how much extract you can lauter and separate from the grain bed?


So for grain calc say that I want to hit 13 Plato in a 15gallon batch.

15gallons = 125lbs of H20
125 * .13 = 16.25 lbs of extract

Would it be 16.25/(brewhouse eff) or 16.25/(brew eff * extraction %)?

I'm guessing the latter so if I had a 80% efficiency and 2row I would get
16.25/(0.8 *0.8) = 25lbs of grain.

Am I thinking about this correctly?

__________________
BrewWorm is offline
 
Reply With Quote Quick reply to this message
Old 04-10-2012, 08:11 PM   #2
jimbot
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2011
Location: Raleigh, NC
Posts: 37
Liked 5 Times on 4 Posts
Likes Given: 11

Default

Let's try this in SG units. You want 1.053 SG (13 Plato) in 15 gallons of wort.

15 gal * 53 = 795 gravity points.

Now you figure your malt bill out so that it adds to that many points. A pound of Pale 2-row is 36 points. Let's saw brewhouse efficiency is 75%, so that pound is now 27 points.

795 points / 27 per pound= 29.4 pounds of Pale 2 row.

Somehow, we got the same result, but I'm not sure how you did that. I don't think you should be using the weight of the water at all.

__________________

Last edited by jimbot; 04-10-2012 at 08:16 PM.
jimbot is offline
 
Reply With Quote Quick reply to this message
Old 04-11-2012, 02:04 AM   #3
BrewWorm
HBT_SUPPORTER.png
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2011
Location: Fort Collins, CO
Posts: 41
Liked 1 Times on 1 Posts
Likes Given: 1

Default

The plato target gives me the percent of sugar to water, so using the weight of the water I can calculate how much sugar I need in that water.

Then it's just trying to figure out how much malt I need to mash to end up with that weight of sugars in the brew kettle. Which is what I'm struggling with.

For example if the starch conversion is 100% efficient for 2row, you'd still end up with only 80% of the weight of the grain in extract. So if I need 16 lbs of extract I would need 20 pounds of 2row if I could mash and lauter PERFECTLY.

So "brewhouse efficiency" should refer to just how close I can get to this 80%? If I can get 80% of the available sugars from the grain, that means that the weight of grain should be equal weight of needed extract/0.64 or at 75% efficiency I'd divide by 0.56.

__________________
BrewWorm is offline
 
Reply With Quote Quick reply to this message
Old 04-11-2012, 02:40 PM   #4
jimbot
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2011
Location: Raleigh, NC
Posts: 37
Liked 5 Times on 4 Posts
Likes Given: 11

Default

I think you have it.

I still think its a lot easier with SG units though.

--Jimbot

__________________
jimbot is offline
 
Reply With Quote Quick reply to this message
Old 04-11-2012, 05:30 PM   #5
BrewWorm
HBT_SUPPORTER.png
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2011
Location: Fort Collins, CO
Posts: 41
Liked 1 Times on 1 Posts
Likes Given: 1

Default

Quote:
Originally Posted by jimbot View Post
I think you have it.

I still think its a lot easier with SG units though.

--Jimbot
Probably. We get pretty close to the same numbers. At 75% my method gives 28.5 lbs where as you were getting 29.4lbs. Maybe this is because when I calculate the weight of the water I used 8.3 lbs when I should be using the weight of wort. That would give me ~30lbs needed.

I'll just start brewing and calculate my BH efficiency. That way as long as I calculate the weights the same every time, I should be able to hit my numbers.
__________________
BrewWorm is offline
 
Reply With Quote Quick reply to this message
Reply



Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Determining Grain Bill: extract eff vs. grain yield gjmonty All Grain & Partial Mash Brewing 0 12-30-2011 02:52 PM
Missing 1 grain from my grain bill... xdalisx All Grain & Partial Mash Brewing 16 05-01-2011 03:57 PM
First foray into All Grain - Is my grain bill too weak? Bradinator All Grain & Partial Mash Brewing 13 02-22-2011 12:17 AM
Crushing Grain In the Brewhouse yetanothersteve All Grain & Partial Mash Brewing 21 10-16-2009 03:53 PM
all grain extraction help desperately needed hopandgator All Grain & Partial Mash Brewing 16 01-22-2007 09:30 AM