Scroll compressors

Scroll compressors use two scrolls, one fixed and the other moving and coupled to the motor.
The scrolls are interleaved so as to be in contact with one another in various places and thus form a series of gradually thinner pockets of air towards the centre. The fluid is compressed by rotation of the orbiting scroll around the fixed scroll until being discharged in the centre.

Scroll compressors are widely used in home and commercial air-conditioning systems, in heat pumps and in air-conditioning systems for telephone applications and data centres. Capacity ranges are from 2 to more than 100 KW, and consequently their use is not spread in applications with low cooling capacity, where rotary and hermetic reciprocating compressors are preferred, and with very high cooling capacity, where screw and centrifugal compressors are preferred.
Advantages of scroll compressors include smaller dimensions and lower weight than reciprocating compressors of the same capacity, even if higher than rotary compressors. They also have very high efficiency at the design compressor ratio, which however decreases at different working conditions. 
Their best feature is low noise operation and reduced vibrations. High efficiency scroll compressors have been also developed fitted with brushless DC motors and driven by inverters.

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