This is where I will try to post, as often as I can, on beer topics that are related to my beer, the beer I drink, and my beer education.

Wednesday, March 08, 2006

Day 28, Brewing Science Lecture

The morning lecture was done by Dr. Bamforth. Charlie is the one that gives very entertaining lectures. This lecture was a little out of context, covering beer stability, since we are not supposed to be learning that for 2 more weeks. The lecture was more about beer instability actually, the six types being biological, non-biological, light, foam, flavor and gushing. Foam was probably my favorite today. Foam stability is affected by many factors, mostly iso-alpha-acids from hops and proteins. Did you know that scratches in a glass can improve the foam build-up and retention? Apparently the scratches act as a nucleation site in the bottom of the glass. Some pubs will intentionally serve beer in scratched glasses for this reason. It can appear quite appealing, since the scratches also serve to cause a continual flow of bubbles up the center of the glass. To some, Charlie is known as the Pope of Foam, because in his lab he has so many devices for measuring and evaluating foam. He has also published dozens of articles on the subject.
The afternoon lecture was a continuation of our discussion on fermentation vessels. Cylindro-conical Vessels (CCV), are amazing.
-They are cheap to build.
-The yeast settles rapidly and can be recovered easily and efficiently.
-Fermentation is rapid.
-Heat is produced but cooling is efficient because the flow automatically is circulated up the center (by the concentrated flow of CO2 bubbles) and down the sides past the cooling jackets.
-The beer is made more bitter.
However, to receive the full benefit from the hydrostatic pressure, they need to be between 1500 and 6000 hL in size. Not exactly appropriate for most small breweries.

3 Comments:

Blogger Deez Nutz said...

"Apparently the scratches act as a nucleation site in the bottom of the glass"

same concept of boiling stones for experiments.

I want a conical fermentor soooooo bad!

11:42 AM

 
Blogger Andy said...

I second the desire for a conical fermenter. I'd even take a poly one.

12:14 PM

 
Blogger joemonkey said...

I assume you are both completely prepared for the minimum capacity of 1500 hL? Party at your house, WOOOO!

7:54 PM

 

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