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Old 07-12-2012, 12:20 AM   #11
SledgeH
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Utilization is a factor of the time and gravity of the boil. A higher concentration of sugars makes it more difficult for the isomerized alpha acids to dissolve.

 
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Old 07-27-2012, 03:49 PM   #12
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Quote:
Originally Posted by Bobby_M View Post
The gravity of the boil has nothing to do with utilization. BYO experimented with this and the results were confirmed with lab testing of IBUs in the finished batch. What does contribute to utilization as bobbrews already mentioned is the boil volume. The best you can do is 100 IBU of concentration and even that is hard to achieve. If you get your 100 IBU in a 2.5 gallon boil, the best you can get when topped up to 5 gallons is 50 IBU. If you're not trying to brew IPA it wouldn't matter as much.
Do you have a link to these results?
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Old 07-27-2012, 04:28 PM   #13
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"...you're not only affecting IBUs, since the top off water also dilutes the overall hop character, flavor, complexity, quality." bobbrews

You know, hadn't thought much about the dilution factor when partial boiling then topping off. That makes total sense to me and believe it's a good argument for dry hopping post fermentation for a few days before bottling. Going to try dry hopping I think, with my next batch which is going to be an extract/specialty grain version SNPA Clone.

 
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Old 07-27-2012, 10:30 PM   #14
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Quote:
Originally Posted by BrotherBock View Post
Do you have a link to these results?
There's a podcast or two on Basic Brewing Radio with the BYO/BBR collaborative results.

There are other podcasts with John Palmer talking about this issue as well.

John Palmer started saying in 2008 that he "made a mistake" in his book (called How to Brew) when he gave formulas and utilization formulas that considered wort gravity as a factor in hops utilization. He now says it has no affect, and most of the other science minded brewers think the same thing.

John did tell me back in 2010 when we were having a beer and chatting that "break material may have an impact on utilization" but there isn't any formula to correlate that. I didn't ask more questions, but I'm sure he expounded more on that. I just don't remember much more than that, to be honest.

If you google a bit, you may find the newer thinking on hops utilization, the impact of wort gravity on IBUs, and the hows and whys.
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Old 07-27-2012, 10:31 PM   #15
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Quote:
Originally Posted by hepcat View Post
"...you're not only affecting IBUs, since the top off water also dilutes the overall hop character, flavor, complexity, quality." bobbrews

You know, hadn't thought much about the dilution factor when partial boiling then topping off. That makes total sense to me and believe it's a good argument for dry hopping post fermentation for a few days before bottling. Going to try dry hopping I think, with my next batch which is going to be an extract/specialty grain version SNPA Clone.
Dryhopping won't affect IBUs but will increase the hops aroma in the beer.
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Old 07-28-2012, 04:42 PM   #16
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Originally Posted by Yooper View Post
Dryhopping won't affect IBUs but will increase the hops aroma in the beer.
Diluting wort with top off water does affect the overall hop character, flavor, complexity, quality and aroma too.
That was the main point of my response.

Maybe you should share your vast knowledge of IBUs with bobbrews.

 
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Old 07-28-2012, 04:46 PM   #17
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I don't need schooling. Yooper was responding to your response, not my statement. I wasn't narrowing down dryhopping with my statement. And I never made a case that dryhopping affects IBUs. Not sure why you focused on the dryhopping aspect.

Nice edit

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Old 07-28-2012, 04:51 PM   #18
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Quote:
Originally Posted by bobbrews View Post
I don't need schooling. Yooper was responding to your response, not my statement. I wasn't narrowing down dryhopping with my statement. Not sure why you focused on that aspect.
Hey that makes two of us!!
I don't need it either.
I didn't mention IBUs, you did.
Do you get that diluting the wort with top off water will diminish any/all hop character from any/all hop additions prior to topping off?
Again, that was my point.

 
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Old 07-28-2012, 04:52 PM   #19
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You're confusing me. And I'm not understanding why you're getting so defensive or what I'm being accused of.

Btw, you have perfected this -> http://en.wikipedia.org/wiki/Straw_man

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Old 07-28-2012, 04:53 PM   #20
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Defensive? And what part of my last post are you confused about.

 
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