Firstly, you need to start by assessing the air flow (CFM, l/s or m³/h) and pressure (psi or bar) you require. Under-sizing will compromise performance, while over-sizing will waste energy. Moreover, remember that electricity accounts for approximately 80% of the operating costs of an air compressor, so proper sizing and pressure ensure stable and efficient operation.

Here is more information on air flow and pressure:

• Flow rate: measured in cubic feet per minute (cfm), litres per second (l/s) or cubic metres per hour (m³/h). It will vary according to your workload and how long you need a constant air flow.
• Pressure: measured in pounds per square inch (psi) or bars. Heavy-duty tasks require higher pressure levels.

Key benefit: rotary screw compressors offer higher flow rates and higher pressure than piston compressors, making them ideal for industrial applications.

Rotary screw compressors use two screw rotors. They are available in belt-driven, gear-driven and direct-driven models.

Fixed speed compressors

• Operate continuously at a set speed.
• Gear drives are more efficient than belt drives and require less maintenance.

Variable speed compressors (VSD)

• Adjust pressure according to demand, reducing energy consumption by up to 35%.
• Direct drive VSD models with IVR technology and iPM motors offer maximum efficiency.

Tip: It is recommended to opt for a fixed speed compressor for constant demand and choose a VSD compressor if your air requirements fluctuate.

• Oil-injected compressors: Require lubrication for cooling, ideal for heavy-duty industrial use.
• Oil-free compressors: Best for applications needing pristine air quality (e.g., medical or food industries).