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Rancilio Silvia - How to
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jpender
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jpender
Joined: 11 Jul 2011
Posts: 722
Location: California
Expertise: I like coffee

Grinder: OE LIDO
Vac Pot: S/S Moka Pot
Drip: Aeropress
Posted Thu Dec 6, 2012, 11:11am
Subject: Re: Coffee Brewing Method Absorption - A few notes
 

I'm assuming that LRR is defined in Mojo the same way as in the VST patent. If so, LRR = A + yield, and if A is constant then that's the equation of a line with slope=1. So you'd take your values for W-P, divide by C to get A (you could then combine data for different C), add the yield to these data, and then plot them against the yield.

In your tests, the variation in extraction itself is smaller than the measured variation in A. So if there is a proportional correlation with extraction you won't see it with a handful of runs.

Consider the middle case in your graph of extraction vs W-P. The values range from about 28 to 34 grams. That's a lot of scatter, something like 3g. The effect of extraction on A (assuming a proportional effect) would be less than 1g of water over the whole range.
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Netphilosopher
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Posted Thu Dec 6, 2012, 2:52pm
Subject: .
 

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jpender
Senior Member
jpender
Joined: 11 Jul 2011
Posts: 722
Location: California
Expertise: I like coffee

Grinder: OE LIDO
Vac Pot: S/S Moka Pot
Drip: Aeropress
Posted Thu Dec 6, 2012, 3:00pm
Subject: Re: Coffee Brewing Method Absorption - A few notes
 

Slope is rise / run, or delta-y / delta-x. In this case:

(1.40-1.32) / (0.24-0.16)

It's so trivial you're probably looking for something more. The only reason I suggested graphing it this way is it brings into focus how much the noise dominates over the signal.
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Netphilosopher
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Location: USA
Expertise: Just starting

Posted Fri Dec 7, 2012, 4:30am
Subject: .
 

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Great Espresso at Home
Curated selection of the best machines from La Spaziale, Izzo, Quick Mill, La Marzocco & more.
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