9 Lessons Your Parents Taught You About Machine Espresso
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How Does Machine Espresso Work?
Machine espresso makes use of precise pressure and mind-blowing filter technology to make the delicious coffee we enjoy. How exactly does it work?
In order to make espresso, hot water is forced under 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 place your portafilter while making espresso. It disperses water into the portafilter and regulates the pressure of the extraction. There are a variety of group heads, each with its own advantages and disadvantages. Some are designed to provide temperature stability while others are specifically designed to handle pre-infusion. Others are made to control the lever. Some come with a range of features, such as the E61, which is the classic choice among many baristas for its ability to offer multiple perks in a single package.
As you can see in the photo above the head of the group is equipped with several notches. It is possible to place your portafilter inside these notches, and then twist the head to secure it. There is also a gasket of rubber which is located inside the notches to help create a seal when you insert your portafilter into the machine. The notches on the head allow for a precise positioning of the portafilter which is essential to ensure an efficient extraction.
Apart from allowing you easily connect your portafilter, the group head is responsible to ensure that the temperature remains even. It does this by circulating hot water through the brew container and around the portafilter, making sure that it is always at the correct temperature to extract. It is crucial to keep in mind that even a tiny difference can make the difference between a good and a excellent espresso.
The Pump
Contrary to manual piston machines that use a lever to pressurize water, rotary espresso machines rely on motorized pumps to deliver the nine atmospheric bars of pressure necessary to extract espresso. This pressure is built up 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 machine can become damaged due to excessive use and poor cleaning. Pumps are also more complicated mechanically, which can raise prices of even simplest models.
Some espresso machines can eliminate the pump completely and use steam pressure to brew espresso. This could lead to over-extraction since the boiler that makes steam also heats the water to boil. Additionally, these machines frequently have to rebuild their pressure between cups, which takes time and energy.
Many espresso machines employ an rotary or vibrating pump, which has a vibration model that uses a vibrating disc to generate the pressure and rotating models that push hot water through the grounds at high speed. Both machines produce great espresso, however rotary machines are quieter, more durable and less likely to break down.
The Boiler
The boiler is the component which heats the water to the optimal temperature to extract. The steam that is produced reaches the portafilter, which contains the ground espresso and is then funneled down into the cup. During this process, steam creates pressure to push through the grounds of the coffee. This results in a layer crema that is then poured over. This is the hallmark of a good espresso.
There are three types of espresso machines, each with different pumps and the temperature of the brew. There are various ways in which the brew can be controlled, as well as the size of the cup that the machine can produce.
The earliest espresso coffee machines for sale machines were steam type. They utilized one boiler to make steam and brew, however, the pressure they could produce was not very high - two bars of atmospheric pressure maximum. The coffee tasted bitter and burnt. The modern espresso machine was invented by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.
The most commonly used espresso maker is a semi-automatic one with an electric pump. These are what people imagine when they think of an espresso machine. With a semi-automatic espresso machine machine, you grind the beans and then tamp them by hand, but the pump provides regulated water flow and pressure. This is a great compromise between human control and mechanized consistency.
The Filter
Typically, espresso machines employ a filter to separate out the grounds of coffee as they move through the hot water. The filter is also a vital part of the machine's temperature control, since it helps to prevent overheating.
Filters also aid in flavor, as it permits a longer flowering phase. This allows beans to release their nuances and gives an opportunity for better extraction.
However, it is important to remember that even a top espresso machines filter can result in a poor cup of coffee as the quality of the beans and extraction is important.
This is where the magic happens, it's what makes an espresso really taste good. The grouphead (also known as the brewhead) is where you put the portafilter, which is the thingy used to place the grounds of coffee into when making espresso.
Steam-driven espresso machines use hot water heated in an airtight vessel to create steam. The steam then pushes hot water through grounds of the coffee under pressure. These machines are cheaper and easier for the user to maintain than pumps-driven models. They are however limited to create the ideal conditions for brewing, as they operate with 1-1.5 bar of pressure. The ideal shot requires 9-10 bars.
In recent times, espresso machines powered by a compressed air pump have become increasingly popular. They utilize an air compressor to force hot water through the ground and are much more mobile than electric steam-driven espresso machines.
Machine espresso makes use of precise pressure and mind-blowing filter technology to make the delicious coffee we enjoy. How exactly does it work?
In order to make espresso, hot water is forced under 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 place your portafilter while making espresso. It disperses water into the portafilter and regulates the pressure of the extraction. There are a variety of group heads, each with its own advantages and disadvantages. Some are designed to provide temperature stability while others are specifically designed to handle pre-infusion. Others are made to control the lever. Some come with a range of features, such as the E61, which is the classic choice among many baristas for its ability to offer multiple perks in a single package.
As you can see in the photo above the head of the group is equipped with several notches. It is possible to place your portafilter inside these notches, and then twist the head to secure it. There is also a gasket of rubber which is located inside the notches to help create a seal when you insert your portafilter into the machine. The notches on the head allow for a precise positioning of the portafilter which is essential to ensure an efficient extraction.
Apart from allowing you easily connect your portafilter, the group head is responsible to ensure that the temperature remains even. It does this by circulating hot water through the brew container and around the portafilter, making sure that it is always at the correct temperature to extract. It is crucial to keep in mind that even a tiny difference can make the difference between a good and a excellent espresso.
The Pump
Contrary to manual piston machines that use a lever to pressurize water, rotary espresso machines rely on motorized pumps to deliver the nine atmospheric bars of pressure necessary to extract espresso. This pressure is built up 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 machine can become damaged due to excessive use and poor cleaning. Pumps are also more complicated mechanically, which can raise prices of even simplest models.
Some espresso machines can eliminate the pump completely and use steam pressure to brew espresso. This could lead to over-extraction since the boiler that makes steam also heats the water to boil. Additionally, these machines frequently have to rebuild their pressure between cups, which takes time and energy.
Many espresso machines employ an rotary or vibrating pump, which has a vibration model that uses a vibrating disc to generate the pressure and rotating models that push hot water through the grounds at high speed. Both machines produce great espresso, however rotary machines are quieter, more durable and less likely to break down.
The Boiler
The boiler is the component which heats the water to the optimal temperature to extract. The steam that is produced reaches the portafilter, which contains the ground espresso and is then funneled down into the cup. During this process, steam creates pressure to push through the grounds of the coffee. This results in a layer crema that is then poured over. This is the hallmark of a good espresso.
There are three types of espresso machines, each with different pumps and the temperature of the brew. There are various ways in which the brew can be controlled, as well as the size of the cup that the machine can produce.
The earliest espresso coffee machines for sale machines were steam type. They utilized one boiler to make steam and brew, however, the pressure they could produce was not very high - two bars of atmospheric pressure maximum. The coffee tasted bitter and burnt. The modern espresso machine was invented by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.
The most commonly used espresso maker is a semi-automatic one with an electric pump. These are what people imagine when they think of an espresso machine. With a semi-automatic espresso machine machine, you grind the beans and then tamp them by hand, but the pump provides regulated water flow and pressure. This is a great compromise between human control and mechanized consistency.
The Filter
Typically, espresso machines employ a filter to separate out the grounds of coffee as they move through the hot water. The filter is also a vital part of the machine's temperature control, since it helps to prevent overheating.
Filters also aid in flavor, as it permits a longer flowering phase. This allows beans to release their nuances and gives an opportunity for better extraction.
However, it is important to remember that even a top espresso machines filter can result in a poor cup of coffee as the quality of the beans and extraction is important.
This is where the magic happens, it's what makes an espresso really taste good. The grouphead (also known as the brewhead) is where you put the portafilter, which is the thingy used to place the grounds of coffee into when making espresso.
Steam-driven espresso machines use hot water heated in an airtight vessel to create steam. The steam then pushes hot water through grounds of the coffee under pressure. These machines are cheaper and easier for the user to maintain than pumps-driven models. They are however limited to create the ideal conditions for brewing, as they operate with 1-1.5 bar of pressure. The ideal shot requires 9-10 bars.
In recent times, espresso machines powered by a compressed air pump have become increasingly popular. They utilize an air compressor to force hot water through the ground and are much more mobile than electric steam-driven espresso machines.
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