13 Things You Should Know About Machine Espresso That You Might Not Have Known > 자유게시판

How Does Machine Espresso Work?

The machine espresso Machine small (www.aupeopleweb.com.au) uses precise pressure and filtering system that is awe-inspiring to make the coffee you love. What exactly is it?

In order to make 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 that you insert when brewing espresso. It is responsible for dispersing the water into the portafilter and controlling the pressure of the extraction. There are a variety of group heads each with their own advantages and drawbacks. Some are designed to provide temperature stability while others are specifically designed to handle pre-infusion. Others are built to control the lever. Some are a combination, such as the E61. This is a favorite among baristas as it provides a variety of advantages in one package.

As you can see in the above photo, the group head has several notches where you place your portafilter and twist it by hand to lock it in. There is also a gasket made of rubber in the notches and helps create a seal when you insert your portafilter into the machine. The notches permit the precise placement of the portafilter. This is crucial to ensure a consistent extraction.

Apart from allowing you easily place your portafilter in, the group head is responsible to maintain an even temperature. This is done by cycling hot water around the portafilter and through the brew-basket, making sure that the temperature is always at the right level to extract the coffee. It is important to note that even a slight deviation can make the difference between a good and a great espresso coffee makers.

The Pump

The motorized pumps that are used in rotary espresso machines supply the nine atmospheric bar pressure needed for espresso extraction. This differs from manually operated piston machines that employ levers. The pressure is created by pumping water through a heat-exchanger and then through the ground coffee.

Pumps tend to be cheaper than piston-driven machines and tend to last longer, however both types of machines may be damaged by excessive use and inadequate cleaning. Pumps are also more complicated mechanically, which could increase prices of even simple models.

Certain espresso machines utilize steam pressure instead of a pump in order to brew espresso. This can cause over-extraction because the boiler that makes steam also heats the water until it comes to a boil. The machines must also continually rebuild their pressure between cups. This takes energy and time.

Many espresso machines make use of the rotary or vibration pump. A vibration model makes use of a vibrating disk to generate pressure, while the circular model pushes hot liquid through the ground at a fast speed. Both models can make excellent espresso, but rotary machines are quieter and more durable than vibration pumps.

The Boiler

The dual boiler espresso machine is the one that makes the water warm to a temperature that is ideal for extraction. The steam that is produced reaches the portafilter containing the ground espresso and is then pumped down into the cup. In this process, the steam creates pressure and pushes through the grounds of the coffee. This results in a crema on top of the cheap espresso machine. This is one of the hallmarks of a great espresso.

There are three types of espresso makers. They differ in the kind of pump they use and how hot the coffee is. There are a variety of ways to control the amount of brew, as well as the size of cup that can be produced by the machine.

The earliest mini espresso maker machines were steam type. They had one boiler to make both brew and steam, however the pressure they were able to create was minimal - two bars of atmospheric pressure, at most. The coffee tasted bitter and burned. This is the reason Milanese manufacturers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso machine.

The most commonly used espresso maker is a semiautomatic machine that has an electric pump. These are the images people have when they think of an espresso maker. With a semi-automatic machine, you grind the beans and tamp them yourself but the pump controls the flow of water and pressure. This is an excellent compromise between human touch and mechanized consistency.

The Filter

Espresso machines usually have filters that separate the grounds of the coffee from hot water. The filter is also a vital element of the temperature control system because it stops the machine from overheating.

A filter also improves flavor as it allows for the beans to flower for a longer period of time. This allows beans to release their flavors and provides the chance for better extraction.

It is important to keep in mind that even the best filter could result in a poor cup of coffee. The quality of the beans and the extraction process, are still very important.

This is where the magic happens, and it's what makes espresso taste good. The grouphead (also called the brewhead) is where you place the portafilter, the device that you use to put the coffee grounds into, while making espresso.

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

In recent years, espresso machines powered by compressed air-pump have become increasingly popular. They make use of an air compressor to force hot water into the ground and are more mobile than steam-driven electric espresso maker espresso machines.