9 Things Your Parents Teach You About Machine Espresso > 자유게시판

• 목록
• 답변
• 글쓰기
• 게시판 리스트 옵션
  • 수정
  • 삭제

How Does machine espresso (click through the up coming article) Work?

Machine espresso employs precise pressure and mind-blowing filter technology to create the coffee we love. What exactly does it work?

In order to make buy espresso machines hot water is pushed under pressure through finely ground coffee. The process is similar to making drip coffee. However the pressure is the primary difference.

The Group Head

The group head is the portafilter that you put in when making best small espresso machine. It is responsible for dispersing the water into the portafilter and Machine espresso then controlling the pressure that results from the extraction. There are a variety of group heads each with its own advantages and drawbacks. Some are designed to provide stability of temperature while others are designed to handle pre-infusion. Others are made to control the lever. Some include a combination such as the E61. This is a popular choice among baristas due to the fact that it has multiple advantages in one package.

As you can see in the photo above The group head features many notches in which you can place your portafilter before twisting it with your hands to lock it in. A gasket made of rubber is positioned in the notches to create a seal when you insert your portafilter. The notches on the head allow for an exact positioning of the portafilter which is necessary for an even extraction.

The group head not only lets you to put in your portafilter easily however, it also keeps the same temperature. This is done by cycling hot water around the portafilter, and through the brew-basket, making sure the temperature is always right for extraction. It is important to realize that even a few degree differences can make the distinction between a good and excellent espresso.

The Pump

The motorized pumps in rotary espresso machines supply the nine atmospheric bar pressure needed to extract espresso machine coffee. This differs from manual piston machines that use a lever. This pressure is built up by pumping water through a heat exchanger and then through the ground coffee.

Pumps are typically cheaper and last longer than piston-driven machines. However, both types of machines are susceptible to degrading because of frequent use and inadequate cleaning. They also increase the complexity of mechanical systems that can lead to costly prices for even the most basic models.

Some espresso machines employ steam pressure instead of a pump for brewing espresso. This can cause over-extraction because the boiler that makes steam also warms the water to boil. These machines also have to constantly rebuild their pressure between cups. This takes energy and time.

Many espresso machines make use of a rotary or vibration pump. A vibration model employs a rotating disk to generate pressure, whereas a rotating model pushes hot water through the ground at high speed. Both machines can make excellent espresso however rotary machines tend to be more stable, quieter and less likely to break down.

The Boiler

The boiler is the component which heats the water to the optimal temperature to extract. The steam produced gets to the portafilter which contains the espresso coffee grounds. It is then funneled into the cup. The steam creates pressure and pushes through the grounds of the coffee. This results in a layer crema that is then poured over. This is a hallmark of a great espresso maker for home.

There are three kinds of espresso machines, each with a different type of pump and brew temperature. There are many ways to control the brew and the size of cup that can be produced by the machine.

The earliest espresso machines were steam types. They employed one boiler to make steam and brew, however the pressure they were able to produce was not very high - two bars of atmospheric pressure at most. This resulted in the coffee tasting burnt and bitter. This is why the Milanese manufacturers Luigi Bezzerra and Desiderio Pavoni developed the modern espresso machine.

The most common espresso machine is a semiautomatic one with an electric pump. When people think of espresso machines, they imagine these machines. Semi-automatic machines require you to grind and tamp the beans yourself The pump, machine Espresso however, regulates the flow of water and pressure. This is a perfect combination of human control and mechanised accuracy.

The Filter

Espresso machines typically use filters that separate the grounds of the coffee from hot water. The filter is also a crucial part of the temperature control system because it stops the machine from overheating.

It also improves flavor as a filter allows for a longer bloom time. This helps the beans to release their flavors and provides an opportunity to improve extraction.

However, it is important to keep in mind that even a great filter can make a terrible cup of coffee, since the quality of the beans and extraction is important.

This is where the magic happens. It's what makes espresso taste great. The grouphead, often referred to as the brewhead, is where the portafilter (the thingy you put the ground coffee in) sits when you're making espresso.

In the steam-driven espresso machine hot water is heated in an airtight container to create steam, which then pushes the hot water through the grounds at a high pressure. These kinds of machines are generally less expensive and easier to maintain than pumps-driven models. They are however limited to create the perfect brewing conditions as they only operate with 1-1.5 bar of pressure. The perfect shot requires 9-10 bars.

In recent years, decent espresso machine machines powered by a compressed air pump have become increasingly popular. They utilize an air compressor to force the hot water through the grounds and are more portable than electric steam-driven machines.