9 Things Your Parents Taught You About Machine Espresso > 자유게시판

How Does Machine espresso machines for home Work?

Machine espresso utilizes precise pressure and incredible filter technology to produce the delicious coffee we enjoy. How 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 Group Head

The group head is the portafilter that is inserted when you are making espresso. It is responsible for dispersing the water into the portafilter and controlling the pressure of the extraction. There are many different kinds of group heads, each with their unique advantages and drawbacks. Some are designed to provide stability in temperature, while others are built to handle pre-infusion. Some are designed to control the lever. Some are a combination, like the E61. This is a popular choice among baristas because it offers multiple advantages in one package.

As you can see in the above image, the group head has many notches in which you can place your portafilter and then twist it with your hands to lock it in. A rubber gasket is located inside the notches, which helps create a seal as you insert your portafilter. The notches on the head permit a precise placement of the portafilter, which is necessary for an efficient extraction.

In addition to allowing you easily insert your portafilter, the group head is responsible to ensure that the temperature remains even. This is accomplished by cycling hot water around the portafilter, and through the brew-basket, ensuring the temperature is always right to extract the coffee. This is crucial, since even a few degrees can make the difference between excellent and great best budget espresso machine.

The Pump

The motorized pumps that are used in rotary espresso machines supply the nine atmospheric bars of pressure required to extract espresso. This differs from manual piston machines that rely on levers. This pressure builds up by removing tap water from a reservoir and pumping it through a heat exchanger prior to being shot through the ground coffee in the group head.

Pumps are typically less expensive than piston-driven machines and tend to last longer. However, both types of machines can get damaged through overuse and lack of cleaning. Pumps are also more complex mechanically, and can add to the cost of even the simple models.

Some espresso machines do away with the pump completely and instead use steam pressure to brew espresso. This can result in over-extraction because the boiler that produces steam also warms the water to boil. Additionally these machines are often required to rebuild their pressure between cups, which takes time and energy.

Many espresso machines make use of an rotary or vibrating pump, with a vibration model that uses a vibrating disc to create pressure and a rotary model pushing hot water through the grounds under high speed. Both machines can produce excellent espresso, however rotary machines are quieter, more durable and less likely to fail.

The Boiler

The boiler is the part that heats water to the ideal temperature to extract. The steam produced will eventually reach the portafilter, which holds the buy espresso makers grounds. It is then poured into the cup. In this process, the steam creates pressure and pushes through the coffee grounds. This results in a layer crema that is then poured over. This is a sign of a good espresso.

There are three types of espresso makers. They differ in the type of pump they use and how hot the coffee is. There are many ways to control the brew and the size of the cup that can be made by the machine.

The first espresso machines were steam-types. They used one boiler to create steam and brew, however, the pressure they could generate was low - only two bars of atmospheric pressure maximum. This resulted in the coffee tasting bitter and burnt. This is why Milanese producers Luigi Bezzerra and Desiderio Pavoni created the modern espresso machine.

The most common espresso machine is a semiautomatic that has an electric pump. When people think of espresso machines, they picture these machines. Semi-automatic machines require you to grind and tamp the beans on your own, but the pump regulates the flow of water and pressure. This is a perfect compromise between human control and mechanised accuracy.

The Filter

Espresso machines usually have a filter that separates the grounds of the coffee from hot water. The filter is also a vital part of the machine's temperature control, as it prevents overheating.

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

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

This is where the magic happens, and it's what makes espresso taste great. The grouphead, sometimes referred to as the brewhead, is where the portafilter (the container you place the coffee ground into) is placed when making espresso.

Steam-driven espresso machines make use of hot water that is heated in an airtight vessel to create steam. The steam then pushes hot water into the grounds of the coffee under pressure. These kinds of machines are generally less expensive and simpler to maintain than pumps-driven models. They are however limited to create the ideal brewing conditions as they only operate with 1-1.5 bar of pressure. The ideal shot requires 9 bar espresso machine-10 bars.

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