The 9 Things Your Parents Teach You About Machine Espresso
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How Does Machine Espresso Work?
Machine espresso uses precision pressure and incredible filter technology to produce the coffee we love. What exactly is it?
Espresso is made by forcing hot water at high pressure through finely-ground coffee. The process is similar to making drip coffee, but the key difference is in the pressure.
The Group Head
The name implies the group head is where you place your portafilter while making espresso. It distributes water into the portafilter, and then regulates the pressure during the extraction. There are a variety of types of group heads each with its distinct advantages and drawbacks. Some are designed to provide stability in temperature, while others are built to handle pre-infusion. Others are built to control the lever. Some include a combination such as the E61. This is a favorite among baristas because it offers multiple advantages in a single package.
As you can see in the image above the head of the group is fitted with several notches. You can place your portafilter in these notches, then twist the head to lock it. There is also a rubber gasket that resides inside the notches to help create a seal when you insert your portafilter into the machine. The notches on the head permit a precise placement of the portafilter, which is crucial to ensure an even extraction.
The group head not only lets you to place your portafilter easily however, it also keeps the temperature at a constant level. It does this by circulating hot water through the brew basket, and around the portafilter to ensure that it's always at the correct temperature to extract. It is important to remember that even a few degree deviation can make the difference between a decent and a excellent espresso.
The Pump
The motorized pumps in espresso machines rotary provide nine atmospheric bar pressure that is required for espresso extraction. This is different from manually operated piston machines that employ a lever. The pressure is created by pumping water through a heat-exchanger and then through the ground coffee.
Pumps are generally less expensive than piston-driven machines and tend to last longer, however both types of machines may get damaged through overuse and lack of cleaning. They also add mechanical complexity, which can result in costly prices for even the most basic models.
Certain espresso machines utilize steam pressure instead of a pump for brewing espresso. This could lead to over-extraction since the boiler that produces steam also warms the water to boil. Additionally these machines are often required to rebuild their pressure between cups, which requires time and energy.
A large majority of espresso machines employ a rotary or vibration pump. A vibration model makes use of a vibrating disk to generate pressure, whereas a circular model pushes hot liquid through the ground at high speed. Both models can make excellent espresso, however rotary machines are quieter and more durable than vibration pumps.
The Boiler
The boiler is the component that heats water to an optimal temperature for extraction. The resultant steam then reaches the portafilter, which contains the ground espresso coffee machine espresso and is then pumped into the cup. During this process the steam is able to create enough pressure to push the coffee grounds through. This creates a layer crema that is then poured over. This is one of the main characteristics of a good espresso.
There are three kinds of espresso makers. They differ in the kind of pump they use and how hot the brew is. There are also different ways in which the brew can be controlled as well as the size of the cup that the maker can create.
The earliest espresso machines were steam-based. They employed only one boiler to make steam and brew, but the pressure they could generate was low - only two bars of atmospheric pressure, at most. This led to the coffee tasting bitter and burnt. The modern espresso machine was invented by the Milanese producers Luigi Bezzerra & Desiderio Pavoni.
The most commonly used espresso maker is a semi-automatic device that has an electric pump. These are the images people have when they imagine an espresso machine. Semi-automatic machines require you to grind and tamp the beans by yourself while the pump controls the water flow and pressure. This is a fantastic compromise between human control and mechanized accuracy.
The Filter
Typically, espresso machines utilize a filter to separate out the grounds of coffee as they move through the hot water. The filter is also a vital component of the machine's temperature control, since it stops overheating.
It also improves flavor, as a filter lets you enjoy a longer bloom time. This lets the beans release their flavor and improves extraction.
It is important to remember that even the most efficient filter can produce a bad cup of coffee. The quality of the beans, as well as the extraction, are still very 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 place the portafilter, the device which you put the coffee grounds in, 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 coffee grounds under high pressure. These machines are less expensive and easier for the owner to maintain than pumps-driven models. They are however limited to create the perfect 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 into the grounds and are much more portable than electric steam-driven machines.
Machine espresso uses precision pressure and incredible filter technology to produce the coffee we love. What exactly is it?
Espresso is made by forcing hot water at high pressure through finely-ground coffee. The process is similar to making drip coffee, but the key difference is in the pressure.The Group Head
The name implies the group head is where you place your portafilter while making espresso. It distributes water into the portafilter, and then regulates the pressure during the extraction. There are a variety of types of group heads each with its distinct advantages and drawbacks. Some are designed to provide stability in temperature, while others are built to handle pre-infusion. Others are built to control the lever. Some include a combination such as the E61. This is a favorite among baristas because it offers multiple advantages in a single package.
As you can see in the image above the head of the group is fitted with several notches. You can place your portafilter in these notches, then twist the head to lock it. There is also a rubber gasket that resides inside the notches to help create a seal when you insert your portafilter into the machine. The notches on the head permit a precise placement of the portafilter, which is crucial to ensure an even extraction.
The group head not only lets you to place your portafilter easily however, it also keeps the temperature at a constant level. It does this by circulating hot water through the brew basket, and around the portafilter to ensure that it's always at the correct temperature to extract. It is important to remember that even a few degree deviation can make the difference between a decent and a excellent espresso.
The Pump
The motorized pumps in espresso machines rotary provide nine atmospheric bar pressure that is required for espresso extraction. This is different from manually operated piston machines that employ a lever. The pressure is created by pumping water through a heat-exchanger and then through the ground coffee.
Pumps are generally less expensive than piston-driven machines and tend to last longer, however both types of machines may get damaged through overuse and lack of cleaning. They also add mechanical complexity, which can result in costly prices for even the most basic models.
Certain espresso machines utilize steam pressure instead of a pump for brewing espresso. This could lead to over-extraction since the boiler that produces steam also warms the water to boil. Additionally these machines are often required to rebuild their pressure between cups, which requires time and energy.
A large majority of espresso machines employ a rotary or vibration pump. A vibration model makes use of a vibrating disk to generate pressure, whereas a circular model pushes hot liquid through the ground at high speed. Both models can make excellent espresso, however rotary machines are quieter and more durable than vibration pumps.
The Boiler
The boiler is the component that heats water to an optimal temperature for extraction. The resultant steam then reaches the portafilter, which contains the ground espresso coffee machine espresso and is then pumped into the cup. During this process the steam is able to create enough pressure to push the coffee grounds through. This creates a layer crema that is then poured over. This is one of the main characteristics of a good espresso.
There are three kinds of espresso makers. They differ in the kind of pump they use and how hot the brew is. There are also different ways in which the brew can be controlled as well as the size of the cup that the maker can create.
The earliest espresso machines were steam-based. They employed only one boiler to make steam and brew, but the pressure they could generate was low - only two bars of atmospheric pressure, at most. This led to the coffee tasting bitter and burnt. The modern espresso machine was invented by the Milanese producers Luigi Bezzerra & Desiderio Pavoni.
The most commonly used espresso maker is a semi-automatic device that has an electric pump. These are the images people have when they imagine an espresso machine. Semi-automatic machines require you to grind and tamp the beans by yourself while the pump controls the water flow and pressure. This is a fantastic compromise between human control and mechanized accuracy.
The Filter
Typically, espresso machines utilize a filter to separate out the grounds of coffee as they move through the hot water. The filter is also a vital component of the machine's temperature control, since it stops overheating.
It also improves flavor, as a filter lets you enjoy a longer bloom time. This lets the beans release their flavor and improves extraction.
It is important to remember that even the most efficient filter can produce a bad cup of coffee. The quality of the beans, as well as the extraction, are still very 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 place the portafilter, the device which you put the coffee grounds in, 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 coffee grounds under high pressure. These machines are less expensive and easier for the owner to maintain than pumps-driven models. They are however limited to create the perfect 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 into the grounds and are much more portable than electric steam-driven machines.
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