solution | Application
Description | Energy
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Control, VVC plus
Based on the size of the
system, the energy consumption of the primary loop can be
substantial. An adjustable frequency drive controlling the primary
system pumps replaces the throttling valves and eliminates trimming
the impellers. Decreasing the pumpís speed with a drive has the
same effect as trimming the pump impeller, except it doesnít
require any labor costs and the pumpís efficiency remains higher.
The result is greater energy efficiency and reduced maintenance and
Two drive control methods are common: One method uses a feedback
signal from a flow meter. The desired constant-flow rate is known, a
flow meter installed at the discharge of each chiller monitors the
pump output. An adjustable frequency drive with a built-in PID
controller maintains the appropriate flow rate, even compensating
for scale buildup and for changing resistance in the primary loop as
chillers and their pumps are staged on and off. This flow meter
feedback application minimizes chiller low evaporator temperature
safety trip-out and manual reset. More...
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