How much power is saved for inverter air compressors than industrial frequency air compressors

Compared with industrial frequency air compressors, variable frequency air compressors have significant advantages in energy saving. Specifically, inverter air compressors can save about 20% to 40% of the electrical energy compared to industrial-frequency air compressors. This energy-saving effect is mainly due to the adaptive adjustment capability of the frequency converter when the load changes.

Analysis of the causes of energy saving:

1. Load regulation capability:

   • The frequency converter controls the motor speed through the inverter, and can automatically adjust the motor speed according to actual gas needs, achieving accurate control of compressed air. When the load is low, the inverter air compressor can reduce the speed and reduce energy consumption; when the load is high, it can quickly increase the speed to meet production needs.

2. Reduce unnecessary energy consumption:

   • When the power frequency air compressor is running, its motor will run at a constant speed regardless of the load changes. This results in the air compressor still generates a lot of useless work and causes energy waste when the load is low. The frequency converter can adjust the motor speed according to the actual load conditions to avoid unnecessary energy consumption.

3. Avoid energy loss during unloading:

   • The operating mode of standard screw air compressors is divided into two states: loading and unloading. During the unloading operation, the motor is running normally, but the air compressor has no high-pressure air output, and the power consumption is about 35% of the time it is loaded. The variable speed technology of the frequency converter minimizes the energy consumption of the compressor by avoiding energy loss during discharging.

Practical case:

Take a 75kW air compressor as an example, when idle, the inverter air compressor can save about 13.8kWh of electricity per hour compared to the industrial frequency air compressor (assuming that the industrial frequency air compressor consumes 75kWh of electricity per hour when idle, and the inverter air compressor consumes about 60kWh of electricity per hour when idle). Calculated based on the 3,000 hours of idle per year, about 414,000 kWh of electricity can be saved in a year. Calculated at 1.00 yuan per kilowatt-hour of industrial electricity costs, about 414,000 yuan of electricity bills can be saved in a year.

Summary:

Inverter air compressors have significant advantages in energy saving compared to industrial-frequency air compressors. Through adaptive adjustment capabilities, the frequency converter can adjust the motor speed in real time according to actual needs, avoid unnecessary energy consumption, and save a lot of electricity. In practical applications, enterprises can choose the appropriate frequency converter model and power according to their own needs to achieve the best energy-saving effect.