Tutorial
lighting, is going both north and south of the work crew. Furthermore, traffic cameras along I-85 can be consulted to provide a visual view of the weather to the west. Based on this information, the city might decide to keep its crew deployed even though the crew may be able to hear thunder. By keeping the crew deployed, the city eliminates the cost of redeployment, and minimizes the losses from the leak since it
Devices put in when the facility was new may not be providing the proper [power factor] correction, and a municipality may be overpaying for its energy and not be aware of it.
can be located and fixed faster.
PUMPING APPLICATIONS Many articles have been written about saving energy in pumping applications by using a variable frequency drive (VFD) on variable flow applications. These articles quote the affinity laws and talk about how pressure drops by the cube for any change in flow.
But most applications are constant speed. In these applications, pumps are staged on to provide step changes in flow. What can be done to reduce energy in these applications? Believe it or not, the VFD can be used here. Most VFD's
can be programmed to go to a set speed when a start command is received allowing you to have the drive go to a fixed reduced speed and save energy. How does this work? As previously mentioned, the
Know how.
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wateronline.com ■ Water Online The Magazine, Cleanwater Edition 35