- Rotary compressors are of positive displacement type in which air is compressed by entrapping it between the reduced space of two sets of engaging surfaces.
- The pressure rise is either by backflow of air (as in roots blower) or by both squeezing action and backflow (as in vanes blower).
- Roots blowerWork done per minute, Wroots = (p2 − p1)V1Roots efficiency, ηroots =
where V1 = volume of air handled per minuterp = 
pressure ratio - Vanes type blowerWork done per revolution =
where i = number of Vanespd = maximum isentropic pressure - Indicated power, I.P. =
kW
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