Air compressors happens to be used in all manufacturing procedures and industrial applications necessitating compressed air. Two types of compressors are there: centrifugal compressors (also called dynamic) and positive displacement compressors.
Most compressors are positive displacement compressors, that is, a mechanism reduces the volume of air to compress it. These fluidairedynamics compressors are generally driven by electric motors that can be check by entering fluidairedynamics.com.
There are different technologies:
Piston compressors. They can be single-cylinder. This type of compressor can rise up to 10 bars of pressure. They also can be multi-stage to boost the pressure in stages and go up to 400 bars. Piston compressors are generally the most economical.
A potential shortcoming of this type of compressor is that it releases oil with the compressed air. If the air you need needs to be clean, you should provide a filtration system or go for an oil-free compressor(this is the case for example for the electronics, pharmaceutical, food industry or for a clean room).
Screw compressors. It is the most common industrial model. It uses helical screws instead of the piston. The pressure acquired can differ from 5 bars for a single-stage model to 13 bars for a multi-stage model.
Some screw compressors are variable speed. They can adapt their rotational speed to compressed air needs to optimize their energy needs.
Vane compressors. The vanes are plates which slide in an eccentric rotor, causing the compression of the air. The energy competence of these compressors use to be generally interesting. They are very compact products compared to other technologies. At the similar pressure and flow rate, these compressors use to have a lower rotation speed than screw compressors, which helps to slow down wear on parts and reduce maintenance requirements. The compressor can thus gain in longevity.
Centrifugal compressors (dynamic compressors) are the second type: with these compressors, air is sucked through the machine by the rotation of a paddle wheel. It is the same principle as that used in turbo-compressors in the automobile. They use to beusually used at the time you want to obtain a high flow rate with a high pressure, and this continuously. This is particularly the case in industries linked to energy production and in the chemical industry.