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How Does Machine Espresso Work?
Machine espresso makes use of precise pressure and incredible filter technology to produce the delicious coffee we enjoy. How exactly does it work?
Espresso is created by forcing hot water under high pressure through finely-ground coffee. The process is similar to making drip coffee however the main difference lies in the pressure.
The Head of the Group
The group head is the portafilter that you place in the espresso maker when making it. It disperses water into the portafilter and regulates the pressure of extraction. There are many different types of group heads each with their own advantages and drawbacks. Some are specifically designed for the stability of temperature while some are designed to handle pre-infusion. Others are made to control the lever. There are some that include a mix of features, such as the E61, which is the most popular choice among baristas because of its ability to provide multiple benefits in a single package.
As you can see from the photo above the group head has a number of notches. You place your portafilter into these notches and twist the head to secure it. A gasket made of rubber is positioned 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 vital to ensure an efficient extraction.
Aside from allowing you to easily connect your portafilter, the group head is also responsible to maintain an even temperature. It does this by cycling hot water through the brew basket, and around the portafilter, making sure that it's always at the correct temperature for extraction. This is crucial, since even a small difference in temperature can make the difference between excellent and great espresso.
The Pump
Contrary to manual piston machines which use a lever to pressurize water, rotating espresso machines rely upon motorized pumps to deliver the nine atmospheric bars of pressure required to extract espresso. This pressure builds up by removing tap water from a reservoir and pumping it through a heat exchanger prior to being pumped through the ground coffee inside the group head.
Pumps tend to be cheaper than piston-driven models, and they tend to last longer, but both types of machines can get damaged through overuse and lack of cleaning. They also make mechanically complex that can lead to the cost of even the most basic models.
Some best espresso machine under 500 machines employ steam pressure instead of a pump to make espresso. The disadvantage of this is that the boiler that produces steam also increases the temperature of water to boiling and can result in over-extraction. Additionally these machines are often required to restore their pressure between cups, which requires time and energy.
Many espresso machines make use of an rotary or a vibration pump. A vibration model employs an oscillating disk to create pressure, whereas the rotary model pushes hot water through the ground at a fast speed. Both machines produce great espresso, however rotary machines are more stable, quieter and less likely to break.
The Boiler
The boiler is the part that heats water to an optimal temperature to extract. The steam that is produced will eventually reach the portafilter, which is a container for espresso grounds. It is then pumped into the cup. During this process the steam creates enough pressure to push the grounds of coffee through. This results in a layer of crema that is then poured over. This is one of the main characteristics of a good espresso.
There are three kinds of espresso makers, which differ in the type of pump they employ and how hot the coffee is. There are different ways that the brew can be controlled, as well as the size of the cup that the machine is capable of making.
The first espresso machines were steam-type. They had one boiler to make both brew and steam, however the pressure they were able to produce was very low - just two bars of atmospheric pressure at the most. This resulted in the coffee tasting burnt and bitter. The modern espresso machine was designed by the Milanese producers Luigi Bezzerra & Desiderio Pavoni.
The most well-known espresso maker is a semi-automatic one that has an electric pump. These are the things people think of when they think of an espresso maker. Semi-automatic machines require you to grind and tamp the beans by yourself while the pump controls the flow of water and pressure. This is a perfect solution that combines human control with mechanized reliability.
The Filter
Espresso machines usually have filters that separate the coffee grounds from the hot water. The filter is also a vital component of the machine's temperature control, as it helps prevent overheating.
It also improves flavor, since a filter can allow for a longer bloom phase. This allows the beans to release their nuances and gives an opportunity for better extraction.
It is important to keep in mind that even the finest filter can make a bad cup of coffee. The quality of the beans, as well as the extraction, remain vital.
This is where the magic happens, it's the thing that makes an espresso really taste great. The grouphead, often called the brew head, is the place where the portafilter (the device you put the coffee grounds into) is located when you're making espresso.
In a steam-driven espresso machine, hot water is heated in an airtight tank to create steam. This then pushes the hot water through the grounds at a high pressure. These types of machines are generally less expensive and simpler to maintain than pumps-driven models. However, they are not as efficient in their ability to create the perfect brewing conditions because they operate 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 make use of an air compressor to push hot water through the ground and are much more mobile than electric steam-driven espresso machines.
Machine espresso makes use of precise pressure and incredible filter technology to produce the delicious coffee we enjoy. How exactly does it work?
Espresso is created by forcing hot water under high pressure through finely-ground coffee. The process is similar to making drip coffee however the main difference lies in the pressure.The Head of the Group
The group head is the portafilter that you place in the espresso maker when making it. It disperses water into the portafilter and regulates the pressure of extraction. There are many different types of group heads each with their own advantages and drawbacks. Some are specifically designed for the stability of temperature while some are designed to handle pre-infusion. Others are made to control the lever. There are some that include a mix of features, such as the E61, which is the most popular choice among baristas because of its ability to provide multiple benefits in a single package.
As you can see from the photo above the group head has a number of notches. You place your portafilter into these notches and twist the head to secure it. A gasket made of rubber is positioned 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 vital to ensure an efficient extraction.
Aside from allowing you to easily connect your portafilter, the group head is also responsible to maintain an even temperature. It does this by cycling hot water through the brew basket, and around the portafilter, making sure that it's always at the correct temperature for extraction. This is crucial, since even a small difference in temperature can make the difference between excellent and great espresso.
The Pump
Contrary to manual piston machines which use a lever to pressurize water, rotating espresso machines rely upon motorized pumps to deliver the nine atmospheric bars of pressure required to extract espresso. This pressure builds up by removing tap water from a reservoir and pumping it through a heat exchanger prior to being pumped through the ground coffee inside the group head.
Pumps tend to be cheaper than piston-driven models, and they tend to last longer, but both types of machines can get damaged through overuse and lack of cleaning. They also make mechanically complex that can lead to the cost of even the most basic models.
Some best espresso machine under 500 machines employ steam pressure instead of a pump to make espresso. The disadvantage of this is that the boiler that produces steam also increases the temperature of water to boiling and can result in over-extraction. Additionally these machines are often required to restore their pressure between cups, which requires time and energy.
Many espresso machines make use of an rotary or a vibration pump. A vibration model employs an oscillating disk to create pressure, whereas the rotary model pushes hot water through the ground at a fast speed. Both machines produce great espresso, however rotary machines are more stable, quieter and less likely to break.
The Boiler
The boiler is the part that heats water to an optimal temperature to extract. The steam that is produced will eventually reach the portafilter, which is a container for espresso grounds. It is then pumped into the cup. During this process the steam creates enough pressure to push the grounds of coffee through. This results in a layer of crema that is then poured over. This is one of the main characteristics of a good espresso.
There are three kinds of espresso makers, which differ in the type of pump they employ and how hot the coffee is. There are different ways that the brew can be controlled, as well as the size of the cup that the machine is capable of making.
The first espresso machines were steam-type. They had one boiler to make both brew and steam, however the pressure they were able to produce was very low - just two bars of atmospheric pressure at the most. This resulted in the coffee tasting burnt and bitter. The modern espresso machine was designed by the Milanese producers Luigi Bezzerra & Desiderio Pavoni.
The most well-known espresso maker is a semi-automatic one that has an electric pump. These are the things people think of when they think of an espresso maker. Semi-automatic machines require you to grind and tamp the beans by yourself while the pump controls the flow of water and pressure. This is a perfect solution that combines human control with mechanized reliability.
The Filter
Espresso machines usually have filters that separate the coffee grounds from the hot water. The filter is also a vital component of the machine's temperature control, as it helps prevent overheating.
It also improves flavor, since a filter can allow for a longer bloom phase. This allows the beans to release their nuances and gives an opportunity for better extraction.
It is important to keep in mind that even the finest filter can make a bad cup of coffee. The quality of the beans, as well as the extraction, remain vital.
This is where the magic happens, it's the thing that makes an espresso really taste great. The grouphead, often called the brew head, is the place where the portafilter (the device you put the coffee grounds into) is located when you're making espresso.
In a steam-driven espresso machine, hot water is heated in an airtight tank to create steam. This then pushes the hot water through the grounds at a high pressure. These types of machines are generally less expensive and simpler to maintain than pumps-driven models. However, they are not as efficient in their ability to create the perfect brewing conditions because they operate 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 make use of an air compressor to push hot water through the ground and are much more mobile than electric steam-driven espresso machines.
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