Danfoss FC 102 Design Manual page 31

Introduction to VLT® HVAC D...
2.7.19 Condenser Pumps
Condenser Water pumps are primarily used to circulate water through the condenser section of water cooled chillers and
their associated cooling tower. The condenser water absorbs the heat from the chiller's condenser section and releases it
into the atmosphere in the cooling tower. These systems are used to provide the most efficient means of creating chilled
water, they are as much as 20% more efficient than air cooled chillers.
2.7.20 The VLT Solution
Frequency converters can be added to condenser water pumps instead of balancing the pumps with a throttling valve or
trimming the pump impeller.
Using a frequency converter instead of a throttling valve simply saves the energy that would have been absorbed by the
valve. This can amount to savings of 15-20% or more. Trimming the pump impeller is irreversible, thus if the conditions
change and higher flow is required the impeller must be replaced.
Water
Inlet
BASIN
Illustration 2.20 The VLT Solution
MG11BC02
Design Guide
Frequency
converter
Flow or pressure sensor
Water
Outlet
Condenser
Water pump
Danfoss A/S © Rev. 06/2014 All rights reserved.
Throttling
valve
2 2
Supply
29