Case Studies

PWA Engineering LLC conducts various pilot tests to furthermore analyze the true efficiencies of the ECM motors compared to existing motors.  Each pilot study works off the power used, measured in watts, by the motors.  Data is collected on the older PSC motor for a determinable amount of time, usually a day or two.  The PSC motor is then replaced with a new high-efficiency ECM motor and data is collected for the same amount of time.  Ideally the ECM motor will be programmed to the user specifications, so the motor is then programmed to run at set rpms for different times during the day.  Likewise data is collected on the programmed ECM motor.  The results of these studies are as follows:

Ø      A 25% decrease in watts used by replacing a PSC motor with an ECM motor

Ø      When the ECM is programmed, it saves up to 86% percent on the watts used over the PSC motor  

If the facility were to only replace the existing motor with the ECM motor it shows a significant decrease in power consumption, saving the facility money.  However, the ideal thing is to program the ECM motor which shows DRAMATIC decreases in the power consumption.

For the actual results of the pilot test at Langley AFB click here.

Here is a list of several more pilot studies from various buildings on Langley AFB in Hampton, VA.  (click on each building to open study) 

• Building 664
• Building 329