Author Topic: FWH Treatment  (Read 1139 times)

Offline mjo2125

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FWH Treatment
« on: January 31, 2020, 07:22:32 AM »
What are the assumptions BeerSmith makes in determining the FWH IBUs?  When I FWH, I transfer wort to the Boil Kettle at the recommended rate of 1 gallon every 5 minutes while the hops are steeping.

Offline Oginme

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Re: FWH Treatment
« Reply #1 on: January 31, 2020, 07:46:42 AM »
Brad touches on FWH techniques and has a bit about how he deals with it in the software in his blog: http://beersmith.com/blog/2008/03/17/the-first-wort-hop-beer-brewing-techniques/

There are so many variants on FWH that a modeling program cannot manage to cover all of them.  This is especially true since there really have not been many utilization studies in conjunction with IBU models to give a reasonable extension onto the current models which are being used.  The other issue that I have run up against is that the bitterness from a FWH addition varies greatly from a boil addition of the same length in terms of perception of bitterness.  While the overall IBU may be the similar (as tested), the perception is greatly different to the imbiber.


 
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Offline mjo2125

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Re: FWH Treatment
« Reply #2 on: January 31, 2020, 12:39:32 PM »
Thanks.  I'm conducting a FWH experiment.  BS-3 predicted 25.7 IBU for standard hopping (60 min boil) and 28.3 IBU for FWH.  Lab analysis shows actual 20 IBUs and 26 IBUs, respectively.  I'm not surprised that the FWH IBU is generally higher.  I'm surprised at the spread (6 IBUs) between standard and FWH hopping.  I thought FWH contributed 10% more than standard as rule of thumb (I assume BS-3 uses the same rule of thumb?).  It took 35 mins to steep the FWH before the boil could begin - just wondering if the 35 min steep time could explain the spread.

Offline BOB357

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Re: FWH Treatment
« Reply #3 on: January 31, 2020, 02:38:38 PM »
Looks like you've learned what many of us have known for quite some time. None of the popular utilization models are accurate and IBUs, whether calculated or measured, don't necessarily translate into perceptible bitterness.
Bob

Offline mjo2125

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Re: FWH Treatment
« Reply #4 on: February 01, 2020, 07:16:24 AM »
Yep - I'll know more about perceived bitterness after I conduct a sensory triangle test with my brew club next month...

Offline Oginme

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Re: FWH Treatment
« Reply #5 on: February 01, 2020, 07:25:08 AM »
Good for you undertaking this work.  I will be interested in hearing your results from the tasting.
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Offline BOB357

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Re: FWH Treatment
« Reply #6 on: February 01, 2020, 09:03:44 AM »
Been brewing for about 12 years and learn new things all the time. You can never know too much.
Bob

 

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