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              Application: Pumps & Fans Control (Buildings)

              • 70% of electrical consumption in Industry is used to turn motors. 33% of them control Pump or Fan Applications.
              • Most of Pump and Fan applications are driven by a DOL solution of SoftStarter. This means that the motor runs at full speed and the flow variation is obtained. The energy consumption falls very little when the flow decreases. At 80% of the nominal flow, the energy consumption remains at 95%. The potential for savings on the installed base is huge.
              • CEMEP association has made a simulation for the European market. The use of Drive in such applications could save 900 M Euro/year and 4 Million tonnes of CO2/year.

              How can a customer manage energy more efficiently?

              • To save energy we have to:
                - drive the motor with a frequency inverter instead of a contactor or Soft Start
                - remove the restriction device (valve or damper)
              • The AC Inverter allows to adjust the speed of the Pump or the Fan, therefor the Flow
              • The result is huge saving compared to conventional solutions:
                - up to 50% for Fan, Pay back of the drive within one Year
                - up to 30 % for a Pump , Payback within 2 years

              Solutions or architectures used in the application

              A) Solution without drive
              The motor turns at fixed speed according to the frequency network and the number of poles.
              Example : 3600 Rpm for 60 Hz
              Motor 2 poles
              The only way to adjust the Flow is a restriction device (damper) generating losses
              B) Energy Saving Solution with drive
              The Drive (named also frequency inverter) allow to varies the frequency therefor the motor speed.
              The Flow is directly proportional to the speed.
              Damper or valve are not any more needed
              C) Energy Consumption with and without drive
              Example for Fan Application
              Outlet damper 
              Variable speed drive 
              50% of Energy saving at 80% of the nominal flow
              Example for Pump Application
              Control valve 
              30% of Energy saving at 80% of the nominal flow

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