20 Questions You Must Always ASK ABOUT Machine Espresso Before You Buy Machine Espresso > 자유게시판

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How Does Machine Espresso Work?

The machine espresso makes use of precise pressure and filtering system that is awe-inspiring to create the coffee you enjoy. How exactly does it work?

Espresso is created by forcing hot water under pressure through finely ground coffee. The process is similar to that of making drip coffee. However it is the pressure that makes the main difference.

The Head of the Group

The group head is the portafilter you place in the espresso maker when making it. It disperses water in the portafilter and regulates the pressure during the extraction. There are many different kinds of group heads each with its particular advantages and drawbacks. Some are specifically designed for the stability of temperature while some are specifically designed to handle pre-infusion. Some are designed to control the lever. Some are a combination, like the E61. This is a preferred choice for baristas since it provides multiple advantages in a single package.

As you can see in the above photo the head of the group has a number of notches. It is possible to place your portafilter in these notches, then twist the head to lock it. A gasket made of rubber is placed inside the notches to help create a seal when you insert your portafilter. The notches on the head permit a precise position of the portafilter which is crucial to ensure an efficient extraction.

The group head not only lets you to insert your portafilter easily however, it also keeps the temperature at a constant level. It does this by circulating hot water through the brew basket, and around the portafilter to ensure that it's always at the right temperature to extract. It is important to realize 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, Rotary espresso machines rely on motorized pumps to supply the nine atmospheric bars of pressure that are required to extract espresso. The pressure is built by pumping water through a heat-exchanger and then through the ground coffee.

Pumps are typically less expensive than piston-driven machines, and tend to last longer, but both types of machines can degrade with overuse and insufficient cleaning. They also add mechanical complexity which can result in costly prices for even the most basic models.

Some espresso machines use steam pressure instead of a pump to brew espresso. This can cause over-extraction because the boiler that produces steam also heats the water to boil. These machines also have to constantly rebuild their pressure between cups. This requires energy and time.

Many espresso machines make use of the rotary or vibration pump. A vibration model makes use of a rotating disk to generate pressure, while the rotating model pushes hot water through the ground at a high speed. Both machines can produce excellent espresso but rotary machines are more stable, quieter and less likely to break.

The Boiler

The boiler is the component that heats the water to the optimal temperature to extract. The resultant steam then reaches the portafilter, which contains ground espresso beans and is then funneled down into the cup. In this process, the steam causes pressure to push through the coffee grounds. This results in a layer of crema that is then poured over. This is a hallmark of a good espresso.

There are three kinds of pro espresso machine makers, which differ in the type of pump they use and the degree of heat that the brew is. There are different ways to control the amount of brew, as well as the size of the cup that can be produced by the machine.

The first espresso machines were steam-types. They used one boiler to make both brew and steam, but the pressure they could create was minimal - two bars of atmospheric pressure, at most. The coffee tasted bitter and burned. This is the reason Milanese producers Luigi Bezzerra and Desiderio Pavoni developed the modern espresso machine.

The most well-known italian espresso machines maker is a semi-automatic one with an electric pump. These are what people imagine when they imagine an espresso machine. Semi-automatic machines require you to grind and tamp the beans yourself, but the pump regulates the water flow and pressure. This is an excellent solution that combines human control with mechanized accuracy.

The Filter

Espresso machines usually use a filter that separates the coffee grounds from the hot water. The filter is also an essential component of the machine's temp control, since it helps to prevent overheating.

It also aids in flavor, as a filter can allow for a longer bloom phase. This lets the beans let their nuances out, and also allows for better extraction.

It is important to remember that even the finest filter could result in a poor cup of coffee. The quality of the beans, as well as the extraction, remain vital.

This is where the magic happens. It's what makes espresso taste good. The grouphead, often referred to as the brew head, is where the portafilter (the thingy you put the best ground coffee for espresso machine (https://www-coffeee-uk14405.bloggin-ads.com/52090211/7-simple-secrets-To-completely-doing-the-best-espresso-machine) coffee into) is placed when you're making espresso.

Steam-driven espresso coffee machines for sale machines use hot water that is heated inside an airtight container to produce steam. The steam then pushes hot water through the coffee grounds under high pressure. These kinds of machines tend to be less expensive and easier to maintain than pumps-driven models. They are however limited to create the perfect conditions for brewing, as they operate with 1-1.5 bar of pressure. The perfect shot requires 9-10 bars.

In recent times, 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 more mobile than steam-driven electric espresso machines.