A Positive Rant Concerning Machine Espresso
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How Does Machine Espresso Work?
Machine espresso employs precise pressure and mind-blowing filter technology to make the delicious coffee and espresso maker we enjoy. How exactly does it work?
To make espresso hot water is pushed under pressure through finely ground coffee. The process is similar to making drip coffee. However it is the pressure that makes the main difference.
The Group Head
The group head is the portafilter that is inserted when you are making espresso. It distributes water into the portafilter, and then regulates the pressure of the extraction. There are several different types of group head, each with their particular advantages and drawbacks. Some are focused on temperature stability, others on pre-infusion features, and others are designed to control the lever. Some come with a combination of both, such as the E61. This is a favorite among baristas due to the fact that it has multiple advantages in a single package.
As you can see in the above image the group head comes with several notches to place your portafilter before twisting it with your hands to lock it in. There is also a gasket of rubber which is located inside the notches and helps to create the seal when you insert your portafilter into the machine. The notches allow for the precise placement of the portafilter. This is crucial to ensure an accurate extraction.
In addition to allowing you to easily connect your portafilter, the group head is also responsible to ensure that the temperature remains even. This is accomplished by cycling hot water around the portafilter and through the brew-basket to ensure that the temperature is constant for extraction. This is important because even a small difference in temperature can make the difference between excellent and great espresso.
The Pump
Unlike manual piston machines, which rely on a lever that pressurize water, rotary espresso machines rely on motorized pumps to provide the nine atmospheric bars of pressure required for espresso extraction. This pressure is generated by pumping water through a heat exchanger and then through the ground coffee.
Pumps tend to be more affordable and last longer than piston-driven machines. However, both types of machines can deteriorate because of excessive use and insufficient cleaning. They also create mechanical complexity that can lead to the cost of even the simplest models.
Certain espresso machines do away with the pump completely and utilize steam pressure to make espresso. This can lead to over-extraction as the boiler that makes steam also heats the water until it comes to a boil. These machines also have to continually rebuild their pressure between cups. This requires energy and time.
Many espresso machines utilize the rotary or vibration pump, which has a vibration model using a rotating disc to create pressure, and rotating models that push hot water through the grounds under high speed. Both models can make 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 ideal temperature to extract. The resulting steam reaches the portafilter that contains the ground espresso and is then pumped into the cup. During this process, steam creates pressure and pushes through the grounds of the coffee. This results in a crema on the top of the espresso. This is one of the main characteristics of a great espresso.
There are three types of espresso machines, each with a different type of pump and brew temperature. There are a variety of ways in which the brew could be controlled as well as the dimensions of the cup the maker can create.
The first espresso machines were steam types. The earliest espresso machines were steam types. This led to the coffee tasting burnt and bitter. The modern espresso machine was created by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.
The most popular espresso machine is a semiautomatic that has an electric pump. When people think of espresso machines, they envision these machines. Semi-automatic machines require you to grind and tamp your beans yourself however the pump controls the flow of water and pressure. This is an excellent compromise between human control and mechanized accuracy.
The Filter
Typically, espresso machines employ filters to separate the grounds of the coffee as they go through the hot water. The filter is also a crucial component of the temperature control system as it prevents the machine from overheating.
A filter can also help with flavor as it allows for a longer flowering phase. This lets the beans release their flavor and also allows for better extraction.
It is important to remember that even the best cheap espresso machine filter can make a bad cup of coffee. The quality of the beans and the extraction process, are still crucial.
This is where the magic happens, it's the thing that makes an espresso machine small really taste good. The grouphead, also referred to as the brew head, is the place where the portafilter (the thingy you put the coffee grounds into) is located when you're making espresso.
Steam-driven espresso machines make use of hot water that is heated in an airtight container to produce steam. The steam then moves hot water through the coffee grounds under high pressure. These kinds of machines are generally less expensive and easier to maintain than pump-driven models. They are however limited to create the ideal conditions for brewing since they only operate with 1-1.5 bar of pressure. The ideal 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 ground, and are more mobile than steam-driven electric espresso machines.
Machine espresso employs precise pressure and mind-blowing filter technology to make the delicious coffee and espresso maker we enjoy. How exactly does it work?
To make espresso hot water is pushed under pressure through finely ground coffee. The process is similar to making drip coffee. However it is the pressure that makes the main difference.The Group Head
The group head is the portafilter that is inserted when you are making espresso. It distributes water into the portafilter, and then regulates the pressure of the extraction. There are several different types of group head, each with their particular advantages and drawbacks. Some are focused on temperature stability, others on pre-infusion features, and others are designed to control the lever. Some come with a combination of both, such as the E61. This is a favorite among baristas due to the fact that it has multiple advantages in a single package.
As you can see in the above image the group head comes with several notches to place your portafilter before twisting it with your hands to lock it in. There is also a gasket of rubber which is located inside the notches and helps to create the seal when you insert your portafilter into the machine. The notches allow for the precise placement of the portafilter. This is crucial to ensure an accurate extraction.
In addition to allowing you to easily connect your portafilter, the group head is also responsible to ensure that the temperature remains even. This is accomplished by cycling hot water around the portafilter and through the brew-basket to ensure that the temperature is constant for extraction. This is important because even a small difference in temperature can make the difference between excellent and great espresso.
The Pump
Unlike manual piston machines, which rely on a lever that pressurize water, rotary espresso machines rely on motorized pumps to provide the nine atmospheric bars of pressure required for espresso extraction. This pressure is generated by pumping water through a heat exchanger and then through the ground coffee.
Pumps tend to be more affordable and last longer than piston-driven machines. However, both types of machines can deteriorate because of excessive use and insufficient cleaning. They also create mechanical complexity that can lead to the cost of even the simplest models.
Certain espresso machines do away with the pump completely and utilize steam pressure to make espresso. This can lead to over-extraction as the boiler that makes steam also heats the water until it comes to a boil. These machines also have to continually rebuild their pressure between cups. This requires energy and time.
Many espresso machines utilize the rotary or vibration pump, which has a vibration model using a rotating disc to create pressure, and rotating models that push hot water through the grounds under high speed. Both models can make 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 ideal temperature to extract. The resulting steam reaches the portafilter that contains the ground espresso and is then pumped into the cup. During this process, steam creates pressure and pushes through the grounds of the coffee. This results in a crema on the top of the espresso. This is one of the main characteristics of a great espresso.
There are three types of espresso machines, each with a different type of pump and brew temperature. There are a variety of ways in which the brew could be controlled as well as the dimensions of the cup the maker can create.
The first espresso machines were steam types. The earliest espresso machines were steam types. This led to the coffee tasting burnt and bitter. The modern espresso machine was created by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.
The most popular espresso machine is a semiautomatic that has an electric pump. When people think of espresso machines, they envision these machines. Semi-automatic machines require you to grind and tamp your beans yourself however the pump controls the flow of water and pressure. This is an excellent compromise between human control and mechanized accuracy.
The Filter
Typically, espresso machines employ filters to separate the grounds of the coffee as they go through the hot water. The filter is also a crucial component of the temperature control system as it prevents the machine from overheating.
A filter can also help with flavor as it allows for a longer flowering phase. This lets the beans release their flavor and also allows for better extraction.
It is important to remember that even the best cheap espresso machine filter can make a bad cup of coffee. The quality of the beans and the extraction process, are still crucial.
This is where the magic happens, it's the thing that makes an espresso machine small really taste good. The grouphead, also referred to as the brew head, is the place where the portafilter (the thingy you put the coffee grounds into) is located when you're making espresso.
Steam-driven espresso machines make use of hot water that is heated in an airtight container to produce steam. The steam then moves hot water through the coffee grounds under high pressure. These kinds of machines are generally less expensive and easier to maintain than pump-driven models. They are however limited to create the ideal conditions for brewing since they only operate with 1-1.5 bar of pressure. The ideal 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 ground, and are more mobile than steam-driven electric espresso machines.
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