Danfoss FC 101 Design Manual page 23

Product Overview
2.6.18 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.
2.6.19 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.
Water
Inlet
BASIN
Illustration 2.14 Condenser Pumps
®
VLT HVAC Basic Drive FC 101 Design Guide
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.
Frequency
converter
Flow or pressure sensor
Water
Outlet
Condenser
Water pump
MG18C502 - Rev. 2013-09-06
Throttling
valve
2 2
Supply
21