9 Things Your Parents Teach You About Machine Espresso > 자유게시판

How Does Machine Espresso Work?

Machine espresso utilizes precise pressure and mind-blowing filter technology to create the perfect cup of coffee. What exactly does it work?

To make an espresso hot water is forced under high pressure through finely ground coffee. The process is similar to making drip coffee but the difference is in the pressure.

The Head of the Group

The group head is the portafilter is inserted when you are making espresso. It is responsible for dispersing water into the portafilter, and controlling the pressure of the resulting extraction. There are various kinds of group heads each with its own advantages and disadvantages. Some are focused on temperature stability, while others on pre-infusion options, and others are designed to control the lever. Some include a mix of features, such as the E61 one, which is the standard choice for many baristas due to its ability to offer multiple perks in one package.

As you can see in the above photo, the group head has numerous notches that you can place your portafilter before twisting it by hand to secure it. A gasket made of rubber is placed inside the notches, which helps create a seal when you insert your portafilter. The notches on the head allow for a precise positioning of the portafilter which is vital for a consistent extraction.

Aside from allowing you to easily connect your portafilter, the group head is responsible to ensure that the temperature remains even. It does this by cycling hot water through the brew basket and around the portafilter, making sure that it's always at the right temperature for extraction. It is important to realize that even a few degree difference can make the difference between a great and a great espresso.

The Pump

Motorized pumps in espresso machines that rotate provide the nine atmospheric bar pressure needed for espresso extraction. This is different from manual piston machines that rely on levers. The pressure builds by drawing tap water from a reservoir and pumping it through a heat exchanger prior to it is shot through the ground coffee in the group head.

Pumps are typically more affordable and last longer than piston-driven machines. However, both types of machines may degrade because of excessive use and insufficient cleaning. Pumps are also more complex mechanically, and can add to the cost of even the simplest models.

Some espresso machines employ steam pressure instead of a pump to brew espresso. The downside is that the boiler that produces steam also raises the temperature of the water until it reaches boiling which could lead to excessive extraction. Additionally these machines are often required to rebuild their pressure between cups, which requires time and energy.

Many espresso machines use an rotary or a vibration pump. A vibration model makes use of the vibrating disk to create pressure, whereas the rotary model pushes hot water through the ground at a high speed. Both types of machine can produce an excellent espresso, however Rotary machines are quieter and more durable than vibration pumps.

The Boiler

The boiler is the component which heats the water to the ideal temperature for extraction. The steam that is produced is then directed to the portafilter, which holds the espresso grounds. It is then funneled into the cup. During this process, steam creates pressure and pushes through the grounds of the coffee. This results in a crema on top of the espresso machines for home. This is a hallmark of a great espresso.

There are three types of espresso machines, each having a different type of pump and the temperature of the brew. There are various ways that the brew can be controlled and the size of the cup that the maker can create.

The first espresso machines were steam types. They had one boiler to make both brew and steam, however the pressure they were able to generate was low - only two bars of atmospheric pressure at the most. The coffee tasted bitter and burned. This is why Milanese manufacturers Luigi Bezzerra and Desiderio Pavoni developed the modern espresso machine.

The most well-known espresso maker is a semiautomatic machine that has an electric espresso maker pump. When people think of espresso machines, they imagine these machines. If you have a semi-automatic espresso machine machine you must grind the beans and then tamp them yourself but the pump is able to regulate the flow of water and pressure. This is a great compromise between the human touch and the mechanised accuracy.

The Filter

professional espresso machine machines typically have filters that separate the grounds of the coffee from the hot water. The filter is also a vital element of the machine's temperature control, since it stops overheating.

It also enhances flavor as a filter can allow for a longer bloom time. This allows the beans to release their flavor and gives an opportunity for a better extraction.

However it is crucial to remember that even a top filter could result in a bad cup of coffee as the quality of the beans and extraction is still crucial.

It's in this area that the magic takes place. This is what makes espresso taste so good. The grouphead, also called the brew head, is the place where the portafilter (the container you place the ground coffee into) is placed when making espresso.

In a steam-driven espresso machine, hot water is heated in an airtight container to create steam, which then pushes the hot water through the 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 ability to create the ideal brewing conditions, as they only operate at 1-1.5 bars of pressure. However, the perfect shot requires 9-10 bar.

In recent times, best cheap espresso machine machines powered by a compressed air pump have become increasingly popular. They use an air-compressor to force hot water into the ground and are much more mobile than steam-driven electric espresso machines.