Does the Type of Fermenter Affect Your Homebrew? · Does the Type of Fermenter Affect Your...
Transcript of Does the Type of Fermenter Affect Your Homebrew? · Does the Type of Fermenter Affect Your...
› Terrence Sullivan and Kimberly Bacigalupo
› Sierra Nevada Brewing in Chico, CA
Many Thanks to Our Friends
› Paul Chlup, Katherine Witrick & Troy Montrone.
› Sweetwater Brewing in Atlanta, GA
Many Thanks to Our Friends
Katherine Witrick and Troy Montrone.
› It Only Took: – 17 Beer Drinkers
– A Sitting Governor
– 1000s of Inquiries
– And a Rubber Chicken
› Resumes due 12/31/15
› Feb 2016 Wynkoop Brewing
› Details Soon www.wynkoop.com
A Contest So Good It Will Never Die
› Where Did I Come Up With The Idea?
› How to Design an Experiment
› How to Limit Variables
› What Were the Results?
› What Do They Mean?
› What Should You Do As a Homebrewer?
› Follow On Experiments
TODAY
› Grand Rapids 2014 AHA Convention
› Drew Beechum & Denny Cohn
› Brewing Experiments at Home Presentation
› Mention of the Nathan Fermenter and 1927
› Commercial Breweries Have Research – Volume and Temperature Control
– Diameter and Cone Angle
– Column Height
› I Asked Myself What About Homebrew-Sized Vessels?
Inspiration
› Developed in 1927 by Leopold Nathan
› Patented in 1931
› Skeptically Received by Brewers
› Bad Timing – Prohibition – Great Depression – World War II – Brewery Consolidation – Tradition over Science
Look Familiar?????
Nathan Fermenter
› Built 1901
› German Immigrant Engineer
› Home
› Then Antique Shop
› Bob Sandage – Homebrewer
– Engineer
– Likes Difficult Projects
The Wrecking Bar Before
› Rated World Class – Beer Advocate & Rate Beer
– 1 of Only 12 in the World
› 4th Anniversary June 19, 2015
The Wrecking Bar Today
› Breaking Bob Kӧlsch (Always Been The Name)
› Brewed Regularly for Several Years
› Lots of Institutional Experience
› Recipe Improved as Necessary
› Great Representative of the Style
› Unexpected Fermentation Issues Should Stick Out
› No Post Fermentation Processing (Filtration, Dry Hopping)
› Wanted to Compare Apples to Apples
Experiment Design: The Beer
› Breaking Bob Kӧlsch Recipe
› 62.5% Heidelberg (not Heisenberg!) Malt
› 37.5% Cologne Malt
› 18.5 IBUs from Magnum for 60 minutes
› 2.5 IBUs from Tettnang for 20 minutes
› WLP029 Kӧlsch yeast
› Water profile matched closely to Köln Germany.
Experiment Design: The Beer
› Wrecking Bar Brew Pub
› Wort Goes Straight to Unitank
› Small Vessel Wort Drawn After Yeast Pitch
› Cool Room for Small Vessels With Temperature Control
› All Transfers Done Within Hours of Each Other
› Time On Yeast As Identical As Humanly Possible
› Bottling, Tasting Trials & Contest On-Site from Draft
Experiment Design: The Brewery
› Transfers Kept to a Minimum
› Duplicates of Each Fermenter For “Murphy-Proofing”
› Everything Mimics Handling of Commercial Portion of Batch
› Fining With Gelatin Only Post Fermentation Task
› 6 Common Homebrew Vessels/Lock Combinations Used – Plastic Bucket (Poppet Lock)
– Carboy (Both Poppet Lock & Blow-Off Tube)
– Cornelius Keg (Blow-Off Tube)
– 12.7 Gallon SS Conical Unitank (Both Poppet Lock & Blow-Off Tube)
Experiment Design: The Process
› All Small Batches Kegged at Same Time
› All Beer Bottled at Same Time
› Bottles Hand Carried to Sweetwater for Testing
› Bottles Overnight Shipped to Sierra Nevada – Minimal Time In Transit
– Cold Packs and Insulated Shipping Container
– Single Container to Save Cost
Experiment Design: The Process (cont)
› Similar to the Observer Effect
› How Do We Observe Without Affecting The Beer?
› Accepted Premise Bottled Versions Would Be Slightly Different
Heisenberg Uncertainty Principle
› Blind Triangle Testing – Subjects Were Mix of:
› BJCP
› Beer Industry
› Pub Patrons
– 3 Samples in Opaque Cups
– 2 are the Same
– Only 1 Sample is Different
– Much More Powerful than A/B Testing › Twice the reliability with half the samples
› Much easier to determine if there is discrimination between samples
– More Breaking Bob Available to Test Against
Human Trials
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Percent Correct
Bucket Carboy Pop Carboy Tube Corny Keg Conical Pop Conical Tube Commercial Unitank
Blind Trial Discrimination
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Bucket Carboy Pop Carboy Tube Corny Keg Conical Pop Conical Tube
Blind Trial Breaking Bob
› Blind Triangle Testing Worked
› The Beers Were “Different” – But Only Slightly
– Many Tasters Couldn’t Tell
› Minimize Waste – Breaking Bob versus Small Fermenters
– Use Smaller Pitchers › Uptick in Discrimination Due to Temperature
– Opaque Cups Critical › Forces Discrimination to Aroma, Flavor & Mouthfeel
› Small Batch Clarity Issues
Lessons Learned
› BJCP Flight 8 Beers – 6 Homebrew Variations
– Breaking Bob Kӧlsch
– Reissdorf Kӧlsch
– Checklist Scoresheets
› GABF Medal/BJCP Mini-BOS – 8 Samples in Numbered Cups
– All Present at Same Time
– Pick 1st, 2nd, 3rd and HM
Human Trials
› BJCP Judges – Master and Grand Master
– 3 National Judges
– 6 Certified
– 14 Total
› Other Qualifications – 4 with Pro Brewing Experience
– 7 Media
– 6 With Industry Experience
– 18 Total Judges/9 Teams
Human Trials
› Scores – Highest 45 – Lowest 26 – Highest Variance (Top/Bottom) 15 – Lowest Variance 7 – 5 Pts Total Average Difference (1-8)
› Analysis – Non-BJCP had 2 Highest Variances – Average Variance was 10 – There WAS a Difference – But Only Slight
Results
› First Round – Breaking Bob 6th by Average Score
– 2nd by 1st, 2nd, 3rd Points
– Score Winner Carboy Tube Bob
– Point Winner Conical Pop Bob
– Reissdorf 2nd by Score 6th by Points
› Second Round – Conical Tube Bob 1st 3 of 9 Times
– Bob Beat Reissdorf 6 of 9 Times
– Breaking Bob Was 3rd
– Bucket Bob Had Lowest Finish
– But It Did Win Once
Results
› Breaking Bob “Standard” – ABV 4.79% – SG 1.007 – 4.48 SRM – IBU 25.85 – pH 4.39 – Haze 156
› Schraderbrau – SG was 1 or 2 Gravity Points Higher
› Except for Conicals
– Gravity Tracked With Alcohol – pH All Normal – No Micro Contamination (Yeah) – One Sample Haze/Color (My Bad)
Lab Results
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Free Diacetyl Precurser Total Diacetyl
5 Gallon 11 Gallon Conical 30 BBL Unitank
Diacetyl Levels (ppb)
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Total Diacetyl (ppb)
Bucket Carboy Pop Carboy Tube Corny Keg Conical Pop Conical Tube Commercial Unitank
Total Diacetyl (ppb)
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Total Pentanedione (ppm)
Bucket Carboy Pop Carboy Tube Corny Keg Conical Pop Conical Tube Commercial Unitank
Total Pentanedione (ppm)
› Biggest Difference – Flat Bottom vs Cone – 5 Gallon vs Larger Batches (The Cone)
› Slight Difference – Flat Bottom vs Hemispherical – Poppet vs Blow-off Tube
› Mitigation Strategy Homebrew – Transfer to Secondary – Higher Pitching Rate? – Agitation?
› Think Stir Plate
Conclusions
› Single Ale Yeast Strain – English Ale Styles?
– Belgian Ale Styles?
– What About Lagers?
› Standard Gravity – High Gravity?
– Low Gravity?
› Geometry 5 vs 11 Gal – Repeat w/SS Conical Fermenters
– 7, 14, 27 & Commercial 30 bbl
– Answers Once and For All Geometry vs Size Question (For That Yeast)
Caveats & Future Experiments