Illustration 2.4: Discharge dampers reduce power consumption somewhat. Inlet Guide Vans offer a 40% reduction but are expensive to install. The
GEfrequency converter solution reduces energy consumption with more than 50% and is easy to install.
2.7.5 Example with Varying Flow over 1 Year
The example below is calculated on the basis of pump characteristics ob-
tained from a pump datasheet.
The result obtained shows energy savings in excess of 50% at the given flow
distribution over a year. The pay back period depends on the price per kwh
and price of frequency converter. In this example it is less than a year when
compared with valves and constant speed.
Energy savings
P
shaft
=P
shaft output
Flow distribution over 1 year
AF-600 FP Design Guide
18
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