Sage Advice About Machine Espresso From A Five-Year-Old > 자유게시판

How Does Machine Espresso Work?

The machine espresso is made using precise pressure, as well as a filtering technology that is amazing to create the coffee you love. What exactly does it work?

To make an espresso, hot water is pushed under pressure through finely ground coffee. The process is similar to that of making drip coffee. However the pressure is the major difference.

The Group Head

The group head is the portafilter that is inserted when you are making espresso. It disperses the water into the portafilter, and then regulates the pressure of the extraction. There are several different types of group heads each with its unique advantages and drawbacks. Some are specifically designed for stability of temperature while others are designed to handle pre-infusion. Some are designed to control the lever. There are even some that come with a range of features, such as the E61, which is considered the most popular choice among baristas for its ability to offer multiple benefits in one package.

As you can see in the above image, the group head has several notches where you place your portafilter and twist it manually to secure it. There is also a gasket made from rubber in the notches, which helps create an airtight seal when you insert your portafilter into the machine. The notches allow for the precise placement of the portafilter. This is crucial to ensure an even extraction.

The group head does not just allow the portafilter to be inserted easily but also maintains a constant temperature. It does this by circulating hot water through the brew basket, and around the portafilter, making sure that it is always at the right temperature for extraction. It is important to realize that even a tiny differences can make the distinction between a great and a excellent espresso.

The Pump

In contrast to piston machines that are manually operated, which use a lever to pressurize water, Rotary espresso machines rely on motorized pumps to supply the nine atmospheric bars of pressure that are required to extract espresso. The pressure builds by drawing tap water from a reservoir and pumping it through a heat exchanger before being pushed through the ground coffee inside the group head.

Pumps are generally cheaper and last longer than piston-driven machines. However, both types of machines may degrade because of excessive use and poor cleaning. They also add mechanical complexity which can result in a high price tag on even the most basic models.

Some espresso machines employ steam pressure instead of a pump for brewing espresso. This can result in over-extraction because the boiler that makes steam also heats the water until it comes to a boil. The machines also need to continually rebuild their pressure between cups. This requires energy and time.

A majority of espresso machines utilize an rotary or a vibration pump. A vibration model employs a rotating disk to generate pressure, whereas a Rotary model pushes hot coffee through the ground at a fast speed. Both machines can produce excellent espresso, but rotary machines are more stable, quieter and less likely to fail.

The Boiler

The boiler is the one that is used to heat the water to the perfect temperature to extract. The resulting steam reaches the portafilter containing the ground espresso and is then funneled down into the cup. During this process, the steam creates pressure that pushes through the coffee machine espresso grounds. This produces a layer of crema that is then poured over. This is one of the hallmarks of a great espresso.

There are three kinds of espresso makers. They differ in the kind of pump they use and how hot the coffee is. There are many ways to control the brew as well as the size of cup that can be produced by the machine.

The first espresso machines were steam type. The earliest espresso machines were steam-type machines. The coffee tasted bitter and burnt. This is why the Milanese manufacturers Luigi Bezzerra and Desiderio Pavoni created the modern espresso machine.

The most well-known espresso maker is a semi-automatic device that has an electric pump. When people think of espresso machines, they imagine these machines. With a semi-automatic machine you must grind the beans and tamp them by hand. However, the pump regulates the flow of water and pressure. This is a great compromise between human control and mechanized consistency.

The Filter

Typically, espresso machines utilize filters to separate the grounds of the coffee as they go through the hot water. The filter is also an essential part of the temperature control system, as it keeps the machine from overheating.

Filters also aid in flavor, as it permits the beans to flower for a longer period of time. This allows the beans to let their nuances out, and allows for a better extraction.

It is important to remember that even the finest filter can produce a bad cup of coffee. The quality of the beans and the extraction process, remain vital.

It's here that the magic happens. This is what makes espresso taste so good. The grouphead (also known as the brewhead) is where you put the portafilter - the thingy that you put the coffee grounds into, while making espresso.

In an espresso machine that is driven by steam, hot water is heated in an airtight tank to create steam, which then pushes the hot water through the grounds at high pressure. These machines are cheaper and easier for the owner to maintain than pumps-driven models. However, they are not as efficient in their ability to create the perfect brewing conditions since they operate at 1-1.5 bars of pressure, while the perfect shot requires 9-10 bars.

In recent years, compressed air pump-driven professional espresso maker machines have been gaining popularity. They utilize an air compressor to force hot water into the grounds, and are far more portable than steam-driven electric machines.