1. Applications
  
    Compresser

2. Features
  
    Air compressors not only apply almost in all industries but also providing sufficient and stable air pressure supply.
    In order to achieve the necessary conditions of production flow, instable air supply will influence product quality.
    Owing to the arrangement at production line and insufficient pressure, air compressors must keep reserve to cope
    with the demands of production line when installed.

    When the air demand at production line is little, air compressors will be run at partial load control mode. The
    conventional screw type air compressors run at constant frequency, therefore, if the compressor runs at a partial
    load for a long time, it may lead to system inefficiency and cause the waste of energy.

    Most of traditional screw air compressors run with constant frequency.
    The ways of the control exhaust are： (1) load and unload (2) valve

3. Application of energy-saving frequency inverter
  
    Compressed Air Energy Input and Useful Energy Output

   

   
     * Source：Compressed Air - Energy Efficiency Reference Guide & Bureau of Energy

1. Discussion on energy saving of compressor with inverter
  
    a. Add unload control mode: 8%-22% of energy saving benefit.

    b. Capacity adjustment (intake throttle) control mode:
         About 30% of energy saving benefit.

    c. Inverter control (constant output pressure) mode:
        The control range of output should be 40%-100%.
        The power consumption is about 50% for 50%-54% of output.

       

        * Source：Bureau of Energy

 2. Energy cost analysis of compressed air system

     a. Leak is the No.1 deadly enemy for energy cost of compressed air system.

     b. Statistical data of US Department of Energy:
    
          - Leak of compressed air is 30%~50% in general factory.
          - It is 10%~30% in better managed factory or new factory.
          - 5%~10% is more acceptable range.

     c. Artificial demand is the compressed air demand which is not useful for production due to
         unnecessary or excess expansion.
   
         - Cause: Due to improper selection in planning and poor control.

       

        * Source：Bureau of Energy