Common sense of coffee machine simple function description of each part of coffee machine
Boiler:
At present, the popular coffee machine boiler materials mainly include copper and stainless steel, but some manufacturers will also use copper alloy and copper plating.
The main characteristics of copper boilers are good extensibility (in frequent hot and cold water alternating, but also to maintain good elasticity), heat transfer speed is faster. In early distilleries it was widely used, such as distillation equipment for spirits. Figure 1.JPG (17.84 KB)
distillation equipment
For coffee machines, the speed of heat transfer will directly affect the uniformity of overall heating, so copper naturally becomes the main material for making boilers. Now some machines cooking head is also made of copper, easy to maintain the temperature of the water.
Since stainless steel appeared much later than copper, the first coffee machines have always been made of copper. The advantages of stainless steel are mainly corrosion resistance and durability. But it seems that stainless steel boilers are expensive.
In addition to the boiler, there are two devices to maintain the normal operation of the boiler: high pressure valve, low pressure valve and discharge valve.
high pressure valve
High pressure valve is a safety device, mainly to protect the safety of operators.
Main principle: When the water in the boiler is heated to generate pressure, when the pressure in the boiler reaches the preset 2bar, the valve will be opened to start the pressure relief action, in order to avoid the pressure is too high and exceeds the pressure limit of the boiler itself.
low pressure valve
Low pressure valve is a valve set to maintain the normal operation of the coffee machine.
Main principle: avoid low pressure in boiler caused by temperature drop and air volume contraction in confined space. When reheating, the air expands faster than the temperature of the liquid due to metal heat conduction, so that the pressure sensing element misjudges the pressure in the boiler and stops heating.
discharge valve
Water unloading valve at the bottom of the boiler, mainly in the long-term start-up, keep the water fresh, clean the boiler scale, maintenance of the machine, the boiler water needs to be completely removed, then open the water unloading valve can be all the water in the boiler discharged.
Source: Network
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The grinding process of coffee should also match the cooking method.
The quality of the minced coffee has a great influence on the next cooking process. The grinding process should also match the cooking method, which is the key to extracting the best flavor from coffee beans. The cooking method of coffee powder which is in contact with hot water for a long time requires thicker particles. If the coffee powder is too fine relative to the cooking method, the coffee will be too bitter, hard and overcooked.
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Basic knowledge about all aspects of coffee-baristas must see
Linnaeus (Swedish naturalist) classifies coffee plants into the Rubiaceae family, such as gardenia. The great naturalist named it Coffea. Although wild plants can grow as high as 10-12 meters, the plantations are about 3 to 5 meters high, with the exception of Colombia, where tree species rarely exceed 2 meters. This makes farming and picking easier and more economical to cultivate. Leaves
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