Can a twin screw blower beat the roots blower?

The technical evolution in the blower market for small volume flows has been very poor in the past 50 years. The step to achieve significant progress in energy efficiency in the low-pressure market, is taken by introducing blowers using internal compression instead of external compression. Rotary lobe blowers, also known as “Roots” type blowers, are positive displacement machines consisting of a pair of two lobed or three lobed rotors, rotating inside an oval shaped casing (Figure 1). One r