10 Quick Tips About Machine Espresso > 자유게시판

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How Does Machine Espresso Work?

The machine espresso is made using precise pressure and filtering system that is awe-inspiring to make the coffee you love. How exactly does it work?

Espresso is created by forcing hot water under pressure through finely-ground coffee. The process is similar to making drip coffee, however the main difference lies in the pressure.

The Head of the Group

As the name suggests the group head is where you put your portafilter in when making espresso. It disperses the water into the portafilter and regulates the pressure of the extraction. There are a variety of group heads, each with its own advantages and disadvantages. Some are focused on temperature stability, some on pre-infusion features, and others are designed to control the lever. Some include a combination like the E61. This is a favorite among baristas as it provides a variety of benefits in a single package.

As you can see in the image above the group head comes with numerous notches that you can put your portafilter, then twist it with your hands to secure it. There is also a rubber gasket in the notches to help create an airtight seal after inserting your portafilter into the machine. The notches allow for precise placement of your portafilter. This is crucial for an efficient extraction.

The group head not only allows you to insert your portafilter easily, but it also maintains a constant temperature. This is done by cycling hot water around the portafilter and through the brew basin, ensuring the temperature is always right for extraction. It is important to note that even a few degree deviation can make the difference between a decent and a excellent espresso.

The Pump

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

Pumps are generally less expensive than piston-driven machines, and they tend to last longer, however both types of machine can become damaged due to excessive use and poor cleaning. Pumps are also more complicated mechanically, and can add to the cost of even simplest models.

Some italian espresso machines (Suggested Web page) machines use steam pressure instead of a pump for brewing espresso. The drawback is that the same boiler that produces steam also raises the temperature of the water to the point of boiling and can result in over-extraction. In addition the machines often have to restore their pressure between cups, which takes time and energy.

A large majority of espresso machines employ an rotary or a vibration pump. A vibration model makes use of the vibrating disk to create pressure, whereas a circular model pushes hot liquid through the ground at high speed. Both machines produce great espresso however rotary machines tend to be more quiet, durable and less likely to break.

The Boiler

The boiler is the element which heats the water to the ideal temperature to extract. The steam created reaches the portafilter, which is the container that holds the espresso coffee grounds. It is then funneled into the cup. During this process the steam creates enough pressure to push the grounds of the coffee through. This produces a layer of crema that is then poured over. This is one of the main characteristics of a good espresso.

There are three kinds of espresso makers, and they differ in the kind of pump they use and how hot the espresso is. There are a variety of ways that the brew may be controlled, as well as the size of the cup that the machine is capable of making.

The first espresso machines were steam-type. The earliest espresso machines were steam-type machines. This led to the coffee tasting bitter and burnt. The modern espresso machine was designed by the Milanese producers Luigi Bezzerra & Desiderio Pavoni.

The most popular espresso machine is a semiautomatic with an electric pump. These are the images people have when they imagine an espresso machine. If you have a semi-automatic machine you need to grind the beans and then tamp them by hand, but the pump is able to regulate the flow of water and pressure. This is a great solution that combines human control with mechanized consistency.

The Filter

Espresso machines typically have a filter that separates the grounds of the coffee from hot water. The filter is also an essential component of the temperature control system, because it stops the machine from overheating.

It also improves flavor, as it allows for a longer bloom time. This helps the beans release their nuances and gives an opportunity for a better extraction.

It is important to keep in mind that even the finest filter can result in a bad cup of coffee. The quality of the beans, as well as the extraction, remain crucial.

It's here that the magic occurs. This is what makes espresso taste so delicious. The grouphead (also known as the brewhead) is where you place the portafilter, which is the thingy which you put the grounds of your coffee into when making barista espresso coffee machine.

Steam-driven espresso capsule machine machines use hot water that is heated in an airtight container to produce steam. The steam then moves hot water through the coffee grounds under high pressure. These kinds of machines tend to be cheaper and easier to maintain than pumps-driven models. However, they are limited in their capacity to create the ideal brewing conditions, as they only operate at 1-1.5 bars of pressure. The perfect shot requires 9-10 bar.

In recent years, espresso machines powered by a compressed air compressor have become increasingly popular. They use an air-compressor to push hot water through the ground and are much more mobile than steam-driven electric espresso machines.