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What is the best water flow rate for water drip coffee maker?
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daio7
Senior Member


Joined: 15 Jan 2014
Posts: 1
Location: malaysia
Expertise: Just starting

Posted Mon Feb 24, 2014, 11:33pm
Subject: What is the best water flow rate for water drip coffee maker?
 

I am now doing a project to optimizing the energy use of coffee machine by inverstigating the mass flow rate. I have to run plenty of project to gather data of power

input vs mass flow rate of water to find out the optimization rate. These experiments I have done but now i face a problem. One of the objective of my project is to

obtain the approriate mass flow rate of water that can brew coffee with good flavor.

What is the mass flow rate of water that can make sure brewed coffee is in good flavor? Is there any article or study about these?
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RandomTask
Senior Member


Joined: 30 Jan 2013
Posts: 67
Location: Saskatchewan, Canada
Expertise: I love coffee

Grinder: Barratza Encore
Drip: Behmor Brazen
Roaster: Behmor 1600
Posted Thu Feb 27, 2014, 9:32am
Subject: Re: What is the best water flow rate for water drip coffee maker?
 

Since no one else has attempted to answer this question, I will do my best. The more technical users on the forum may chime in with a better answer.

From everything I've read, there is no "mass flow rate" listed as optimum for coffee extraction. There is guidelines stated for contact time; how long the water is in contact with the grounds, not how quickly the water is pushed through them. Tempurature is as, if not more, imporant than contact time, as water should be between 92C - 96C through the enitre brewing process.

The SCAA guidelines for brewers state: "For a brewer at maximum coffee and water capacity, the minimum technical requirement is for the water contact time with the coffee grounds shall be more than 4 minutes but less than 8 minutes for all brewers operating under standard temperature and pressure at the manufacturers stated design voltage, depending on grind." with a quantity of grinds of ~55g/litre of water.

All the details of what the SCAA consideres a "certified" brewer can be found on their certified brewer program here.

Unfortunately, your optimum flow rate is going to be based off of the quanty of water held by the brewer so that it dispense all of the water within the 4 minute window.
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christopher197404
Senior Member


Joined: 21 Sep 2013
Posts: 6
Location: Baker
Expertise: I live coffee

Posted Mon Mar 17, 2014, 6:37pm
Subject: Re: What is the best water flow rate for water drip coffee maker?
 

daio7 Said:

I am now doing a project to optimizing the energy use of coffee machine by inverstigating the mass flow rate. I have to run plenty of project to gather data of power

input vs mass flow rate of water to find out the optimization rate. These experiments I have done but now i face a problem. One of the objective of my project is to

obtain the approriate mass flow rate of water that can brew coffee with good flavor.

What is the mass flow rate of water that can make sure brewed coffee is in good flavor? Is there any article or study about these?

Posted February 24, 2014 link

I could not give you a direct answer for what the mass flow rate is, but I advise you could use a normal coffee maker to calculate it out. For example, you could  add 1 liter water to a drip coffee maker and observe the full time it used. Of course, you need to do it more than once and try to use more than one coffee machine. Then The volume divided by the seconds, you will get the mass flow rate of water for the drip coffee maker
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