Danfoss VLT FC 102 Series Design Manual page 34

Introduction to VLT® HVAC D...
2.7.19 Condenser Pumps
2 2
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, and they are as much as 20% more efficient than air cooled chillers.
2.7.20 The VLT Solution
Adjustable frequency drives can be added to condenser water pumps instead of balancing the pumps with a throttling
valve or trimming the pump impeller.
Using an adjustable frequency drive 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
Figure 2.20 The VLT Solution
32
Design Guide
Flow or pressure sensor
BASIN
Water
Outlet
Danfoss A/S © Rev. 06/2014 All rights reserved.
Frequency
converter
Throttling
valve
Condenser
Water pump
Supply
MG11BC22