The 9 Things Your Parents Teach You About Machine Espresso
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How Does Machine Espresso Work?
Machine espresso makes use of precise pressure and amazing filter technology to make the delicious coffee we enjoy. How does it work exactly?
Espresso is made by forcing hot water at high pressure through finely-ground coffee. The process is similar to making drip coffee, but the major difference is in the pressure.
The Group Head
The group head is the portafilter that you put in when making barista espresso machine. It is responsible for dispersing water into the portafilter before controlling the pressure that results from the extraction. There are a variety of types of group heads each with its distinct advantages and drawbacks. Some are designed to provide the stability of temperature while some are designed to handle pre-infusion. Others are built to control the lever. Some have a combination, like the E61. This is a preferred choice for baristas because it offers multiple benefits in one package.
As you can see in the above photo, the group head is equipped with several notches. The portafilter is placed into these notches and twist the head to secure it. A gasket made of rubber is placed inside the notches to help create a seal as you insert your portafilter. The notches on the head permit a precise placement of the portafilter, which is essential for a consistent extraction.
The group head is not just able to allow you to insert your portafilter easily however, it also keeps the same temperature. It does this by cycling hot water through the brew basket, and around the portafilter, making sure that it is always at the correct temperature for extraction. This is important because even a small difference in temperature can mean the difference between good and excellent espresso.
The Pump
The motorized pumps that are used in rotary espresso machines supply the nine atmospheric bar pressure needed to extract espresso. This is different from manual piston machines that use levers. The pressure is created by pumping water through a heat-exchanger and then through the ground coffee.
Pumps tend to be cheaper and last longer than piston-driven machines. However, both types of machines can degrade due to excessive use and poor cleaning. Pumps are also more complex mechanically, and can add to the price of even the simpler models.
Certain espresso machines utilize steam pressure instead of a pump to make espresso. The downside is that the same boiler that produces steam also increases the temperature of water to boiling which could lead to excessive extraction. Additionally these machines are often required to restore their pressure between cups, which requires time and energy.
A large majority of espresso machines employ an rotary or a vibration pump. A vibration model employs an oscillating disk to create pressure, while the Rotary model pushes hot coffee through the ground at high speed. Both machines can make excellent espresso, but rotary machines are more quiet, durable and less likely to break down.
The Boiler
The boiler is the part that heats the water to the optimal temperature for extraction. The steam that is created reaches the portafilter, which is the container that holds the espresso coffee grounds. It is then funneled into the cup. During this process the steam is able to create enough pressure to push the grounds of coffee through. This results in a whipped-up top of the espresso. This is one of the main characteristics of a great espresso.
There are three types of espresso makers, which differ in the type of pump they employ and how hot the brew is. There are different ways to control the brew and the size of cup that can be produced by the machine.
The first espresso machines were steam-types. The first espresso machines were steam-type machines. The coffee tasted bitter and burned. The modern espresso machine was created by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.
The most common espresso machine is a semiautomatic that has an electric pump. When people think of espresso machines, they imagine these machines espresso. With a semi-automatic machine you grind the beans and then tamp them yourself but the pump provides regulated water flow and pressure. This is an excellent compromise between human touch and the mechanized accuracy.
The Filter
Espresso machines typically use filters that separate the coffee grounds from the hot water. The filter is also a vital component of the machine's temp control, since it stops overheating.
It also improves flavor, as a filter can allow for a longer bloom time. This allows the beans to release their flavors and provides the chance for better extraction.
It is important to keep in mind that even the most efficient filter could result in a poor cup of coffee. The quality of the beans, and the extraction, remain vital.
This is where the magic happens, and it's what makes espresso taste good. The grouphead (also known as the brewhead) is where you put the portafilter - the thingy that you use to put the coffee grounds in, when making travel espresso maker.
In a steam-driven espresso machine, hot water is heated in an airtight container to create steam. This then pushes the hot water through the grounds at a high pressure. These types of machines are usually less expensive and easier to maintain than pumps-driven models. However, they are limited in their ability to provide the ideal brewing conditions, since they are only operating at 1-1.5 bars of pressure. While the perfect shot requires 9-10 bars.
In recent years, compressed air-pump-driven espresso machines have become more popular. They utilize an air compressor to push hot water through the grounds, and are far more portable than electric steam-driven machines.
Machine espresso makes use of precise pressure and amazing filter technology to make the delicious coffee we enjoy. How does it work exactly?
Espresso is made by forcing hot water at high pressure through finely-ground coffee. The process is similar to making drip coffee, but the major difference is in the pressure.
The Group Head
The group head is the portafilter that you put in when making barista espresso machine. It is responsible for dispersing water into the portafilter before controlling the pressure that results from the extraction. There are a variety of types of group heads each with its distinct advantages and drawbacks. Some are designed to provide the stability of temperature while some are designed to handle pre-infusion. Others are built to control the lever. Some have a combination, like the E61. This is a preferred choice for baristas because it offers multiple benefits in one package.
As you can see in the above photo, the group head is equipped with several notches. The portafilter is placed into these notches and twist the head to secure it. A gasket made of rubber is placed inside the notches to help create a seal as you insert your portafilter. The notches on the head permit a precise placement of the portafilter, which is essential for a consistent extraction.
The group head is not just able to allow you to insert your portafilter easily however, it also keeps the same temperature. It does this by cycling hot water through the brew basket, and around the portafilter, making sure that it is always at the correct temperature for extraction. This is important because even a small difference in temperature can mean the difference between good and excellent espresso.
The Pump
The motorized pumps that are used in rotary espresso machines supply the nine atmospheric bar pressure needed to extract espresso. This is different from manual piston machines that use levers. The pressure is created by pumping water through a heat-exchanger and then through the ground coffee.
Pumps tend to be cheaper and last longer than piston-driven machines. However, both types of machines can degrade due to excessive use and poor cleaning. Pumps are also more complex mechanically, and can add to the price of even the simpler models.
Certain espresso machines utilize steam pressure instead of a pump to make espresso. The downside is that the same boiler that produces steam also increases the temperature of water to boiling which could lead to excessive extraction. Additionally these machines are often required to restore their pressure between cups, which requires time and energy.
A large majority of espresso machines employ an rotary or a vibration pump. A vibration model employs an oscillating disk to create pressure, while the Rotary model pushes hot coffee through the ground at high speed. Both machines can make excellent espresso, but rotary machines are more quiet, durable and less likely to break down.
The Boiler
The boiler is the part that heats the water to the optimal temperature for extraction. The steam that is created reaches the portafilter, which is the container that holds the espresso coffee grounds. It is then funneled into the cup. During this process the steam is able to create enough pressure to push the grounds of coffee through. This results in a whipped-up top of the espresso. This is one of the main characteristics of a great espresso.
There are three types of espresso makers, which differ in the type of pump they employ and how hot the brew is. There are different ways to control the brew and the size of cup that can be produced by the machine.
The first espresso machines were steam-types. The first espresso machines were steam-type machines. The coffee tasted bitter and burned. The modern espresso machine was created by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.
The most common espresso machine is a semiautomatic that has an electric pump. When people think of espresso machines, they imagine these machines espresso. With a semi-automatic machine you grind the beans and then tamp them yourself but the pump provides regulated water flow and pressure. This is an excellent compromise between human touch and the mechanized accuracy.
The Filter
Espresso machines typically use filters that separate the coffee grounds from the hot water. The filter is also a vital component of the machine's temp control, since it stops overheating.
It also improves flavor, as a filter can allow for a longer bloom time. This allows the beans to release their flavors and provides the chance for better extraction.
It is important to keep in mind that even the most efficient filter could result in a poor cup of coffee. The quality of the beans, and the extraction, remain vital.
This is where the magic happens, and it's what makes espresso taste good. The grouphead (also known as the brewhead) is where you put the portafilter - the thingy that you use to put the coffee grounds in, when making travel espresso maker.
In a steam-driven espresso machine, hot water is heated in an airtight container to create steam. This then pushes the hot water through the grounds at a high pressure. These types of machines are usually less expensive and easier to maintain than pumps-driven models. However, they are limited in their ability to provide the ideal brewing conditions, since they are only operating at 1-1.5 bars of pressure. While the perfect shot requires 9-10 bars.
In recent years, compressed air-pump-driven espresso machines have become more popular. They utilize an air compressor to push hot water through the grounds, and are far more portable than electric steam-driven machines.