Technology comparison

4-> 1: Suction. Air enters the compression chamber. The air volume remains constant while the lobe rotors turn.
1-> 2: External compression. The air is compressed externally due to back-pressure of the connected pipeline.
2-> 3: Discharge. Air is pushed out into the pipeline.

As shown in the Pressure/Volume diagram, the compression work is represented by the blue area and is proportional to the energy

• Click here to see the compression principle of a lobe element
  
  

4 -> 1: Suction. Air enters the compression chamber.
1 -> 2: Internal compression. As the rotors move towards each other, the air volume decreases.
2-> 3: Discharge. Air is pushed out into the pipeline.

As shown in the Pressure/Volume diagram, the compression work is represented by the blue area and is proportional to the energy consumed. The green area represents energy savings of a screw blower compared to a traditional ‘Roots’ type rotary lobe blower. This is due to the internal compression.
 
The ZS screw blower is on average 30% more energy efficient compared to a traditional ‘Roots’ type lobe blower. 

• Click here to see the compression principle of a screw element