Something About The Temperature Of Ground Coffee

Something About The Temperature Of Ground Coffee

Do you care about the temperature change of 3 Celsius in the coffee machine? If so, you should also pay attention to the temperature changes in the ground coffee. The relationship between the temperature of ground coffee and the quality of coffee is often overlooked.

There is indeed a correlation between the temperature of ground coffee and the quality of coffee, and the coffee industry is increasingly taking it seriously.

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Does Your Grinder Cause The Coffee To Heat Up?

There are many different types of grinders, but whether you choose a cone or flat grinder, ceramic or metal cutters, boutique coffee grinders are usually platters rather than blades.

The cutter plate grinding machine is composed of two cutters, and the distance between the cutters will affect the grinding thickness. When the power is turned on, at least one of the cutters spins and grinds the beans into small chunks.

However, since this process creates friction, friction generates heat. This heat is transferred to the grinder and the ground coffee. Unless you are using very specialized equipment, the temperature of the grinder will vary each time depending on how long it is running.

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Of course, professional grinding machines usually have cooling devices, including fans, heat exchangers, radiators, and so on. However, few of these cooling devices work accurately, and most do not allow users to monitor the temperature of the ground coffee.

"The temperature depends on the speed of the mill, the frequency of use or the noise of the mill," said Lawro, who has experimented with grinders made by several different manufacturers.

The change of temperature will affect the extraction of coffee, leading to problems of coffee quality and stability.

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The Influence Of Unstable Temperature Of Coffee Powder

Lauro says that as the temperature of the ground coffee rises (including in the grinder itself), you'll notice that the coffee extraction time gets shorter and shorter. As the extraction time gets faster, you'll have to adjust the grinding scale to a finer level to address the problem of extracting too fast.

When the barista uses the same grinder at an off-peak time, the temperature of the cutters has dropped and the barista must adjust the grinding scale again. This may not sound like a big deal, but the more often you adjust the Settings of the grinder, the greater the risk of errors, instability, and poor extraction results.

What's more, Lawro says, when the grinder heats up, it speeds up the grinding, creating a ripple effect. "The temperature of the grinder will affect how much you grind your coffee, so you can predict the amount of grinding you are going to grind from the handle based on the grinder's timer, but the performance of the grinder will vary depending on the grinding temperature."

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Lauro was asked why temperature would affect the extraction and grinding time of coffee, which he says is still being studied. "Our first idea was to change the particle size distribution, so we ground the same coffee at different temperatures and analyzed it with the Master Sizer tool."

"In addition, when the same test was performed on another brand of grinder, the difference in coffee ground showing fine grinding was minimal. It's not statistically significant, according to Andre, but I think even a small difference in fine grinding can still have a big impact on the surface area of the coffee grounds, or maybe it's because we're not using the right analytical instruments."

Whatever the reason, however, Lauro is clear about one thing: changes in temperature can have an effect on coffee.

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Why Is It So Hard To Keep The Grinder Cold?

While it's easy to prevent the grinder from getting hot, it's not impossible to cool it down. In the case of Mythos II, the grinder is designed on the outside and made of aluminum to keep it as cool as possible.

In other words, you can cool a bean grinder by raising the input cost, but for the average person looking for efficiency and energy savings, this doesn't seem to be the ideal option.

But how much does it actually cost to cool the grinder? In 2010, Colin says, there was a widespread belief that hot ground coffee was bad and cold ground coffee was good.

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Stabilize The Temperature Of The Ground Coffee

Colin says the problem may not be whether the ground coffee is hot or cold, but rather the change in temperature. So the team put the theory to the test, grinding different coffee powders at different temperatures and then analyzing the extracts. The result?

"The solubility of these compounds varies according to the water temperature, which can affect the final extraction result, "Lara says.

What's more, as long as it remains stable, regardless of the actual temperature inside the grinder, the team can adjust the grinder and get the same extraction time and flavor characteristics for each shot of espresso, no matter how fast they fill the powder.

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In other words, their research suggests that the biggest problem with grinding machines is the stability of temperature, not the temperature itself.

They still stress the importance of cooling the coffee grinder to avoid extreme heating. However, when producing Mythos II, they also built in a preheating feature that allows the user to reduce the amount of cooling needed to cool the grinder, thus saving energy without risking temperature instability.

Ground coffee temperature is not a variable we are used to discussing, but it can affect quality and stability. For stores that use a lot of grinders, grinders can cause particular problems because they heat up during heavy use.

But as with most variations in coffee, stability is key. It doesn't matter what temperature you grind your beans too, as long as you keep them at a stable temperature every time.

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