Danfoss VLT HVAC Drive FC 100 Series Design Manual page 17

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VLT HVAC Drive Design Guide
Illustration 2.4: Discharge dampers reduce power consumption somewhat. Inlet Guide Vans offer a 40% reduction but are expensive to install. The
Danfossfrequency converter solution reduces energy consumption with more than 50% and is easy to install.
2.6.5. 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 =P
shaft
Flow distribution over 1 year
MG.11.B7.02 - VLT ® is a registered Danfoss trademark
2. Introduction to VLT HVAC Drive
shaft output
2
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