The 9 Things Your Parents Taught You About Machine Espresso
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How Does Machine Espresso Work?
Machine espresso uses precision pressure and amazing filter technology to make the perfect cup of coffee. But how exactly does it work?
Espresso is made by pushing hot water at high pressure through finely-ground coffee. The process is similar to making drip coffee. However the pressure is the major difference.
The Head of the Group
The name implies, the group head is the place you put your portafilter in when making espresso. It is responsible for dispersing the water into the portafilter before controlling the pressure of the extraction. There are a variety of types of group heads each with its distinct advantages and drawbacks. Some focus on temperature stability, while others on pre-infusion features, and others are designed to control the lever. Some are a combination, such as the E61. This is a preferred choice for baristas as it provides a variety of benefits in one package.
As you can see in the photo above The group head features many notches in which you can put your portafilter, then twist it by hand to secure it. There is also a gasket of rubber in the notches, which helps create the seal when you insert your portafilter into the machine. The notches permit an exact placement of the portafilter. This is crucial for an even extraction.
Apart from allowing you easily insert your portafilter, the group head is also responsible for maintaining an even temperature. It does this by circulating hot water through the brew basket, and around the portafilter, ensuring that it's always at the correct temperature for extraction. This is vital, because even a small difference in temperature can be the difference between a good and excellent espresso.
The Pump
Contrary to manual piston machines that use a lever to pressurize water, Rotary espresso machines rely on motorized pumps to supply the nine atmospheric bars of pressure necessary for espresso extraction. This pressure is generated by pumping water through a heat-exchanger and then through the ground coffee.
Pumps tend to be less expensive than piston-driven models, and they tend to last longer, however both types of machine can get damaged through overuse and lack of cleaning. Pumps are also more complex mechanically, which could increase the cost of even the simple models.
Some espresso machines make use of steam pressure instead of a pump to brew espresso makers. This can lead to over-extraction as the boiler that produces steam also warms the water to boil. The machines also need to continuously rebuild their pressure between cups. This takes energy and time.
Many espresso machines use the rotary or vibration pump. A vibration model uses the vibrating disk to create pressure, whereas a Rotary model pushes hot coffee through the ground at a high speed. Both types of machine can produce an excellent espresso, however Rotary machines are quieter and more durable than vibration pumps.
The Boiler
The boiler is used to heat the water to the right temperature for extraction. The steam that is produced reaches the portafilter containing ground espresso beans and is then pumped down into the cup. In this process, the steam creates pressure that pushes through the coffee grounds. This creates a foam on the top of the espresso. This is the hallmark of a great espresso.
There are three types of espresso makers, and they differ in the type of pump they employ and how hot the brew is. There are a variety of ways that the brew can be controlled as well as the size of the cup that the machine can produce.
The first espresso machines were steam-types. The first espresso machines were steam-type machines. This led to the coffee tasting burnt and bitter. The modern espresso machine was designed by the Milanese manufacturers Luigi Bezzerra & Desiderio Pavoni.
The most commonly used espresso maker is a semi-automatic one that has an electric pump. These are what people imagine when they think of an espresso machine. With a semi-automatic machine, you grind the beans and tamp them by hand, but the pump is able to regulate the flow of water and pressure. This is a perfect compromise between human control and mechanised reliability.
The Filter
Typically, espresso machines have filters to separate the coffee grounds as they pass through the hot water. The filter is also an essential component of the temperature control system as it prevents the machine from overheating.
It also improves flavor, as a filter allows for a longer bloom time. This lets the beans release their nuances, and also allows for better extraction.
It is important to remember that even the best filter can result in 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 travel espresso maker really taste great. The grouphead (also called the brewhead) is where you place the portafilter, the thingy which you put the coffee grounds in, when making espresso.
Steam-driven espresso machines use hot water that is heated inside an airtight container to produce steam. The steam then moves hot water through the coffee machines espresso grounds under high pressure. These machines are less expensive and are easier for the user to maintain than pumps-driven models. They are however limited in their ability to create the perfect conditions for brewing as 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 are becoming increasingly popular. They use an air compressor to force hot water through the ground, and are more mobile than electric steam-driven espresso machines.
Machine espresso uses precision pressure and amazing filter technology to make the perfect cup of coffee. But how exactly does it work?
Espresso is made by pushing hot water at high pressure through finely-ground coffee. The process is similar to making drip coffee. However the pressure is the major difference.The Head of the Group
The name implies, the group head is the place you put your portafilter in when making espresso. It is responsible for dispersing the water into the portafilter before controlling the pressure of the extraction. There are a variety of types of group heads each with its distinct advantages and drawbacks. Some focus on temperature stability, while others on pre-infusion features, and others are designed to control the lever. Some are a combination, such as the E61. This is a preferred choice for baristas as it provides a variety of benefits in one package.
As you can see in the photo above The group head features many notches in which you can put your portafilter, then twist it by hand to secure it. There is also a gasket of rubber in the notches, which helps create the seal when you insert your portafilter into the machine. The notches permit an exact placement of the portafilter. This is crucial for an even extraction.
Apart from allowing you easily insert your portafilter, the group head is also responsible for maintaining an even temperature. It does this by circulating hot water through the brew basket, and around the portafilter, ensuring that it's always at the correct temperature for extraction. This is vital, because even a small difference in temperature can be the difference between a good and excellent espresso.
The Pump
Contrary to manual piston machines that use a lever to pressurize water, Rotary espresso machines rely on motorized pumps to supply the nine atmospheric bars of pressure necessary for espresso extraction. This pressure is generated by pumping water through a heat-exchanger and then through the ground coffee.
Pumps tend to be less expensive than piston-driven models, and they tend to last longer, however both types of machine can get damaged through overuse and lack of cleaning. Pumps are also more complex mechanically, which could increase the cost of even the simple models.
Some espresso machines make use of steam pressure instead of a pump to brew espresso makers. This can lead to over-extraction as the boiler that produces steam also warms the water to boil. The machines also need to continuously rebuild their pressure between cups. This takes energy and time.
Many espresso machines use the rotary or vibration pump. A vibration model uses the vibrating disk to create pressure, whereas a Rotary model pushes hot coffee through the ground at a high speed. Both types of machine can produce an excellent espresso, however Rotary machines are quieter and more durable than vibration pumps.
The Boiler
The boiler is used to heat the water to the right temperature for extraction. The steam that is produced reaches the portafilter containing ground espresso beans and is then pumped down into the cup. In this process, the steam creates pressure that pushes through the coffee grounds. This creates a foam on the top of the espresso. This is the hallmark of a great espresso.
There are three types of espresso makers, and they differ in the type of pump they employ and how hot the brew is. There are a variety of ways that the brew can be controlled as well as the size of the cup that the machine can produce.
The first espresso machines were steam-types. The first espresso machines were steam-type machines. This led to the coffee tasting burnt and bitter. The modern espresso machine was designed by the Milanese manufacturers Luigi Bezzerra & Desiderio Pavoni.
The most commonly used espresso maker is a semi-automatic one that has an electric pump. These are what people imagine when they think of an espresso machine. With a semi-automatic machine, you grind the beans and tamp them by hand, but the pump is able to regulate the flow of water and pressure. This is a perfect compromise between human control and mechanised reliability.
The Filter
Typically, espresso machines have filters to separate the coffee grounds as they pass through the hot water. The filter is also an essential component of the temperature control system as it prevents the machine from overheating.
It also improves flavor, as a filter allows for a longer bloom time. This lets the beans release their nuances, and also allows for better extraction.
It is important to remember that even the best filter can result in 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 travel espresso maker really taste great. The grouphead (also called the brewhead) is where you place the portafilter, the thingy which you put the coffee grounds in, when making espresso.
Steam-driven espresso machines use hot water that is heated inside an airtight container to produce steam. The steam then moves hot water through the coffee machines espresso grounds under high pressure. These machines are less expensive and are easier for the user to maintain than pumps-driven models. They are however limited in their ability to create the perfect conditions for brewing as 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 are becoming increasingly popular. They use an air compressor to force hot water through the ground, and are more mobile than electric steam-driven espresso machines.
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