What is the power requirement for a screw air compressor with a capacity of 20 cubic meters per minute and a pressure of 10 kilograms?

Basis for Calculating the Power of Screw Air Compressors

Under operating conditions of an exhaust volume of 20 m³/min and an exhaust pressure of 1. 0 MPa (i.e., 10 kgf/cm², approximately equal to 10 bar), the shaft power typically requires comprehensive consideration of adiabatic efficiency, mechanical efficiency, and intake conditions (such as temperature, humidity, and altitude). Based on industry experience, GB/T 13277-2018 “Air Quality Grades for General Use Compressors,” and the typical performance curves in Appendix A of ISO 1217, the power of the drive motor for this specification of machine generally ranges from132 kW to 160 kW.

Key Factors Affecting Power

• Volumetric Efficiency and Isentropic Efficiency: High-quality twin-screw compressors can achieve an isentropic efficiency of 70%– 75%, which directly affects energy consumption;
• Intake Conditions: Power is lowest under standard operating conditions (20℃, 1 atm, 0% relative humidity); high temperatures and altitudes significantly increase power consumption;
• System Configuration: Whether it includes variable frequency control, waste heat recovery, two-stage compression, etc., affects the actual input power;
• Safety Margin: Manufacturers usually reserve a 5%–10% power margin to ensure long-term stable operation.

Therefore, when selecting a model, it is recommended to refer to the performance curve charts provided by the manufacturer and prioritize products that have passed CE, ISO 8573 certification, or have a Chinese energy efficiency label of level two or above.