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| | Economical aspects |
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Not every pump application will benefit from VFD control. The only way to determine if a VFD will result in an economically satisfying solution is to do a thorough analysis. Pumping with variable frequency drive (VFD) controlled systems can be separated into two different cases:
- A variable continuous flow is required by the process (common for industrial applications). The normal way to control the flow is by throttling. The use of a VFD will, in most cases, lead to a substantial energy reduction.
- VFD vs. ON-OFF regulation (common for sewage applications). Variable speed drive is used to reduce pipe system losses when pumping. The effect of the VFD-control depends on the pipe system used. Systems with high losses relative to the geodetic head will benefit from VFD control, while the impact of a VFD in lift systems (low losses relative to geodetic head), is negligible at best. A though system analysis has to be performed in order to determine whether variable frequency control might be economically motivated.
This type of analysis can be performed with ITT Water & Wastewater pump selection program,
Flyps. Contact your ITT Water & Wastewater representative to get support on this!
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Engineering
