Spike Brewing 12.5 Conical Fermenter Giveaway!

Home Brew Forums > Home Brewing Beer > Beginners Beer Brewing Forum > Full Boil vs. Partial boil Hops utilization

Reply
 
LinkBack Thread Tools
Old 11-12-2008, 09:22 PM   #11
jds
Feedback Score: 0 reviews
 
jds's Avatar
Recipes 
 
Join Date: Oct 2007
Location: Littleton, CO
Posts: 1,947
Liked 17 Times on 14 Posts

Default

Quote:
Originally Posted by GearBeer View Post
Yes, 'tis sad with the cost of hops nowadays.

Therefore, I shall charge you with a crusade. You must seek out the Holy Turky Fryer.
And so the lad said:

"Seek ye the holy fowl cooker, so that it may be brewed.
Two cubits across and three high, no less shall ye seek.
Appoint it with the ball valve of mercy, so that ye may drain it well.
Let not the oil contaminate it, nor let it runneth over."
__________________
jds is offline
 
Reply With Quote Quick reply to this message
Old 11-12-2008, 11:00 PM   #12
Grinder12000
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
Grinder12000's Avatar
Recipes 
 
Join Date: Jul 2008
Location: Columbus WI
Posts: 2,945
Liked 33 Times on 29 Posts
Likes Given: 2

Default

Quote:
"Seek ye the holy fowl cooker, so that it may be brewed.
Two cubits across and three high, no less shall ye seek.
Appoint it with the ball valve of mercy, so that ye may drain it well.
Let not the oil contaminate it, nor let it runneth over.
BRAVO!!! THAT is blog worthy
__________________

Grinders Island Brewery - Pipeline

Bottled! Award winning East India Porter, Oatmeal Stout, Milk Stout, Saison fermenting at a nice controlled 85 degrees (up from 70) as it should be - weird isn't it.

Grinder12000 is offline
 
Reply With Quote Quick reply to this message
Old 11-13-2008, 12:13 PM   #13
emgesp1
Feedback Score: 0 reviews
Recipes 
 
Join Date: Nov 2008
Location: Oak Lawn, IL
Posts: 90
Default

As BarleyWater informed me.

When doing a partial-boil and late extract method, you can't rely on beersmith, or similar program to calculate the IBU's, because it doesn't take into account the water you will be topping off with.

So, if you are using Beersmith, or similar program when creating a recipe, and say for example your aiming at 30 IBU's, you actually will want to aim for 60, because if you aim for 30, after top off you will only get 15.

__________________
emgesp1 is offline
 
Reply With Quote Quick reply to this message
Old 11-13-2008, 12:38 PM   #14
emgesp1
Feedback Score: 0 reviews
Recipes 
 
Join Date: Nov 2008
Location: Oak Lawn, IL
Posts: 90
Default

Here is an easy rule of thumb if your not doing a full-boil.

You can assume 50% of the total amount of IBU's calculated using a program like beersmith. So, if you end up topping off with 2.5 gallons of water, you will end up with 50% of what the program orginally calculated. Also, you must always go by 100 IBU as a limit. You can't calculate 50% of say 150 IBU's and expect 100 total IBU's, because 100 IBU's is the total limit regardless of brewing methods.

__________________
emgesp1 is offline
 
Reply With Quote Quick reply to this message
Old 11-13-2008, 12:39 PM   #15
emgesp1
Feedback Score: 0 reviews
Recipes 
 
Join Date: Nov 2008
Location: Oak Lawn, IL
Posts: 90
Default

Sorry, I accidentally screwed up my math on my previous post, I meant to say 200 IBU's.

__________________
emgesp1 is offline
 
Reply With Quote Quick reply to this message
Old 11-13-2008, 01:24 PM   #16
Donner
Feedback Score: 0 reviews
Recipes 
 
Join Date: Feb 2008
Location: Oxford, MS
Posts: 819
Liked 2 Times on 2 Posts

Default

I just want to make sure i'm understanding. Beer Alchemy, (which most people don't use since they don't have mac) does take into account the amount of h20 in the pre boil, post boil, transfer and water used to top off. Changing any of those numbers does change the number of IBUs projected.

Are you saying that the numbers can't be trusted because of a flaw in the brewing softwares? I just want to make sure i understand. I mean i understand you are diluting down a partial boil and that changes how hops are utilized and the concentration of the IBUs, but i don't understand where the softwares start to tell you the wrong information if it takes into account how much water you top off with.

__________________
DonFeitel.com
Donner is offline
 
Reply With Quote Quick reply to this message
Old 11-13-2008, 04:36 PM   #17
Grinder12000
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
Grinder12000's Avatar
Recipes 
 
Join Date: Jul 2008
Location: Columbus WI
Posts: 2,945
Liked 33 Times on 29 Posts
Likes Given: 2

Default

I agree. Beer tools does have a button that calculates IBU's and when I go from a full boil to a partial boil it takes an appropriate number of IBU's away!

But you guys are saying it's wrong?

__________________

Grinders Island Brewery - Pipeline

Bottled! Award winning East India Porter, Oatmeal Stout, Milk Stout, Saison fermenting at a nice controlled 85 degrees (up from 70) as it should be - weird isn't it.

Grinder12000 is offline
 
Reply With Quote Quick reply to this message
Old 11-13-2008, 08:01 PM   #18
BarleyWater
Feedback Score: 0 reviews
 
BarleyWater's Avatar
Recipes 
 
Join Date: Jan 2007
Location: Armpit of Dallas (Irving), TX
Posts: 2,211
Liked 20 Times on 16 Posts
Likes Given: 1

Default

Quote:
Originally Posted by Grinder12000 View Post
I agree. Beer tools does have a button that calculates IBU's and when I go from a full boil to a partial boil it takes an appropriate number of IBU's away!

But you guys are saying it's wrong?
Yes. So is the one in Beer Smith. It lowers the IBU, but only as a result of the increased gravity of a partial boil, none of the equations are set up to take in dillution of the wort. You really can count on getting about half of what it tells you. Read the link I posted earlier, its all in there.
__________________

Fermenting: Nada
On Tap:Cran Wit, Dr Pepper Dubbel, Cascadian Pale Ale, Dark Chocolate Stout, Imperial Stout, Brown Mild, Schwarzbier
On Board: IIPA


www.franconiabrewing.com
BarleyWater is offline
 
Reply With Quote Quick reply to this message
Old 11-13-2008, 08:21 PM   #19
okstatepike
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2008
Location: Austin, TX
Posts: 45
Default

This is interesting... I never thought of this before. Is there a way to set up your recipe in BeerSmith to correctly calculate IBUs in a partial boil?

If not, I don't think I am following the solution. Is it as easy as formulating the recipe in BS to have double the IBUs I want? (reading other link now...)

__________________
Red Dirt Brewing Co.
Planning: None
Secondary: None
Kegged: None
Drinking: Everything
okstatepike is offline
 
Reply With Quote Quick reply to this message
Old 11-13-2008, 11:06 PM   #20
emgesp1
Feedback Score: 0 reviews
Recipes 
 
Join Date: Nov 2008
Location: Oak Lawn, IL
Posts: 90
Default

Quote:
Originally Posted by okstatepike View Post
This is interesting... I never thought of this before. Is there a way to set up your recipe in BeerSmith to correctly calculate IBUs in a partial boil?

If not, I don't think I am following the solution. Is it as easy as formulating the recipe in BS to have double the IBUs I want? (reading other link now...)
How much water will you be topping off with?

If 2.5 g, then assume 50% of the calculated IBU's, with 100 IBU's as the limit.
__________________
emgesp1 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
Full Boil to Partial Boil Issues larsen67 Beginners Beer Brewing Forum 3 03-15-2010 02:16 AM
Question about water amount in full boil or partial boil neldred Beginners Beer Brewing Forum 6 10-17-2009 03:50 AM
Question about full boil vs. partial boil with kits Jaha35 Beginners Beer Brewing Forum 5 04-29-2009 10:37 PM
full boil/partial boil question KingC Beginners Beer Brewing Forum 2 01-14-2008 04:34 PM
Full Boil hop utilization lizard tail General Techniques 2 12-10-2007 04:41 PM