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HairVise
Senior Member


Joined: 11 Dec 2013
Posts: 1
Location: San Francisco
Expertise: I love coffee

Posted Wed Dec 11, 2013, 11:28am
Subject: Aeropress Java Jug
 

I recently bought a Java Jug from Aeropress so that I could use my press while traveling as well as to make two cups of coffee at a time. For a single cup, I use the inverted method with 16 grams of coffee, brewing for a minute, and I'm very pleased with the results.

Trying to make enough coffee for two has never worked for me though. If I double the amount of coffee, then the concentrate is very small. Adding enough water to the second cup line on the jug makes for a very watery and disappointing coffee.

Anyone out there have any brilliant techniques for making more than one cup at a time with the aeropress and java jug?

Thanks,

hairvise
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jpender
Senior Member
jpender
Joined: 11 Jul 2011
Posts: 708
Location: California
Expertise: I like coffee

Grinder: OE LIDO
Vac Pot: S/S Moka Pot
Drip: Aeropress
Posted Wed Dec 11, 2013, 4:22pm
Subject: Re: Aeropress Java Jug
 

I haven't done this, but two ideas come to mind. The first is to brew in a larger container and only use the Aeropress (in stages) or a cone filter to seperate the coffee from the grounds. Then you don't have to worry about making a concentrate.

If you insist on using the limited confines of an Aeropress in a single stage then you'll have to updose to compensate for the loss of dissolved solids in the grounds. All else being equal, this is a formula for figuring out how much coffee you'll need:

c = (e - sqrt(e^2 - 4easm/w)) / (2ea/w)

c = amount of coffee
e = extraction (e.g., 0.20)
a = approximate absorption ratio of grounds (e.g., 1.2)
s = strength of coffee in mug (e.g. 0.0125)
m = size of mug
w = brew water that will fit in the Aeropress

This will produce a concentrate of volume: x = w - ac, at a strength of ec/(ec + w).
So you'd need to add (m-x) hot water to the concentrate to get your mug.

...in theory at least.
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CheapBastid
Senior Member


Joined: 3 Dec 2012
Posts: 73
Location: Los Angeles
Expertise: I like coffee

Espresso: None
Grinder: Infinity - talking myself...
Vac Pot: None
Drip: Mr Coffee
Roaster: None
Posted Fri Dec 20, 2013, 1:57pm
Subject: Re: Aeropress Java Jug
 

If you're running it inverted, where are you setting the plunger? Try pulling the plunger out as far as you safely can to allow for more extraction in the press.

I tend to have it resting at the top of the 4, but I've run it below the bottom of the 4 when I'm trying to get as much coffee brewed as possible.

I always make sure that I gently top off the pour as the bloom subsides.  This allows me to try to get as much water into the grounds as they steep.
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jpender
Senior Member
jpender
Joined: 11 Jul 2011
Posts: 708
Location: California
Expertise: I like coffee

Grinder: OE LIDO
Vac Pot: S/S Moka Pot
Drip: Aeropress
Posted Fri Dec 20, 2013, 5:13pm
Subject: Re: Aeropress Java Jug
 

CheapBastid Said:

If you're running it inverted, where are you setting the plunger? Try pulling the plunger out as far as you safely can to allow for more extraction in the press.

Posted December 20, 2013 link

There's not enough room for what he was asking.

He's using 16 g of coffee to make "one cup" so assuming his coffee is about 1.25% strength that means his cup is around 8 oz, i.e. 1 cup. So in order to make twice this much he'll have to use 2 cups of water plus the amount of water that the coffee absorbs. That's going to something like 500 ml. The Aeropress when inverted with the plunger inserted only 1 cm has a volume of about 290 ml. Not even close! Even my modified Aeropress can only hold about 320 ml.

If you plug the numbers into the equation I wrote above (with 20% extraction, 1.25% strength, 1.2 absorption factor, a 460 ml mug, and with the expectation of fitting 220 ml of water into the inverted Aeropress, you will find that you need 36 g of coffee. That's considerably more than twice his 16 g dose because so much of the strong (~3.3%) coffee is trapped in the grounds. The resultant concentrate would be only ~175 ml while over 40 ml of coffee the same strength would be stuck in the grounds. Almost one fifth of the coffee is lost. This is why it's so inefficient to do it this way.

I think a larger Aeropress would have a market. Maybe not a big enough market for Aerobie though.
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