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jpender
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jpender
Joined: 11 Jul 2011
Posts: 614
Location: California
Expertise: I like coffee

Grinder: OE LIDO
Vac Pot: S/S Moka Pot
Drip: Aeropress
Posted Wed Dec 5, 2012, 1:07pm
Subject: Re: Coffee Brewing Method Absorption - A few notes
 

Netphilosopher Said:

In fact, of contact time, brew water, grind level, and extraction...the only thing with a strong, reliable correlation is the actual mass of the brew coffee.

Posted December 5, 2012 link

No strong correlation, sure, but that's not what one would expect. Those data don't demonstrate that there is not the level of correlation that would occur if extraction really has zero effect on absorption (sponge model). Like my runs, yours exhibit far too much noise to see a signal. You'd need many more data to hope to tease out (or demonstate the absence of) this small effect. I stopped after ten runs because I could see it would take hundreds to measure something that has no practical value, only coffee-geekeryness.

But think about it: If A is really independent of extraction, it would mean that the more solubles you remove from the grounds, the more water those grounds retain.
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Netphilosopher
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Posted Wed Dec 5, 2012, 3:04pm
Subject: .
 

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jpender
Senior Member
jpender
Joined: 11 Jul 2011
Posts: 614
Location: California
Expertise: I like coffee

Grinder: OE LIDO
Vac Pot: S/S Moka Pot
Drip: Aeropress
Posted Wed Dec 5, 2012, 5:34pm
Subject: Re: Coffee Brewing Method Absorption - A few notes
 

Netphilosopher Said:

If I run an extraction of 15% and one at 24% and I don't see an effect or correlation, then it is essentially meaningless.

Posted December 5, 2012 link

That it is of no practical value to the coffee brewer I fully agree. It's an academic point.

Netphilosopher Said:

And what you said is what is happening - the solubles removed from the grounds are, in fact, replaced by water mass in the grounds.

Posted December 5, 2012 link

Well maybe it's happening, I sure don't know, but your data in that graph aren't sufficient to demonstrate it.
If they were we would be able to use it to plot LRR vs. yield and get a line with slope=1.
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Netphilosopher
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Posted Thu Dec 6, 2012, 6:26am
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Netphilosopher
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