When we measure green coffee bean density, it can provide important information about the coffee we are about to roast. It forms our roasting plan including charge temperature and how the coffee will react when we apply heat over time. Knowing a coffee bean’s density prepares us to manage heat to optimize for flavor. It also gives us clues how the green coffee beans will behave during the dry phase, browning phase, first crack and even the development phase.
One of the things I love about my channel is being able to share what I have learned (and continue to learn) about roasting coffee. Low density coffee conducts heat slower through to the bean center than than a high density coffee. One of my “virtual ” mentors is Joe Morocco who, along with Mill City, have shared a great amount of knowledge as it relates to coffee roasting theory. This topic of heat transfer being affected by density is important. I would encourage everyone to take a look at Joe’s very good blog article as it relates to bean density, moisture levels and heat transfer here https://joemarrocco.com/2016/10/24/coffee-roasting-measuring-what-matters/
According to Joe, he recommends a higher charge temp with very low gas at charge, and then ramping gas back up to a lower setting.
Thank you to @daRock1212 for the advice related to this topic. It is situations like this why I am so thankful for the home coffee roasting community!
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HOW TO MEASURE COFFEE BEAN DENSITY
We measure green coffee bean density by using a container like a drinking cup, fill it with 250 grams of water and mark the fill line with a dark marker. This is now the standard measurement for every coffee you want to learn it’s density. Place the empty measuring cup you just made onto a scale, tare it, and then pour the green coffee beans into the cup, even to the fill line. The weight that displays on the scale is the green coffee’s weight in grams. Now divide that by your standard of measurement which in this example is 250 grams. The result is a number that begins with a decimal Even a home coffee roaster can determine how to measure, something like 0.7692. Now simply remove the decimal and use the first 3 numbers, in this case, 769. This is our number! To know what this number is, refer to the ranges below:
High Density 700+
Medium Density 600 – 700
Low Density 500 – 600
Here is the formula for to determine the density of green coffee beans:
Weight (g) ÷ Volume (mL) = Density (g/mL).
What type of questions do you have about home coffee roasting. Comment below OR go to my community tab and answer my post!
Video Timeline
0:00 Measure green coffee bean density
0:34 What is green coffee bean density?
1:22 What influences the density of a coffee seed?
4:05 Why should we care about green coffee bean density?
7:19 Have your roasts been impacted by bean density?
8:17 How do I change my roast plan based on density?
11:35 How to measure green coffee bean density
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I roast coffee on my Mill City 500 gram commercial coffee roaster every week. I also use a Behmor and a hot air popcorn popper to roast some great coffee. Join me as we roast, brew and cup coffee every week at home.
Do you roast coffee at home? Do you craft single serve coffee and if so, what brewing method do you like? Please share your comments and be sure to like this video!
About Me:
I am a coffee enthusiast who roasts coffee from home on my sample size commercial drum coffee roaster. Coffee has been in my life for over 40 years, whether I was selling it or roasting it, I want to share my passion with you.
Supplies to Build Your Coffee Cart & Organize
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Hefty 15 Quart Storage Bins – https://amzn.to/2MsOYFh
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