Description | Traditional
solution | Energy Savings
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Control, VVC plus,
In primary/secondary pumping
systems, great energy savings and control potential is realized by
adding adjustable frequency drives to control the secondary system,
changing it from constant speed, variable volume to variable speed,
variable volume. With drives applied, the pumps are controlled to
vary their speed with the system requirements (the system curve)
instead of simply "riding" the pump curve. This results in
operation following the system curve, optimum energy savings and
eliminates the over-pressurization of the cooling coil two-way
control valves. With reduced speed, life of the pump and motor
bearings are increased. Although the same cooling coil differential
head is maintained in the individual air handling units, the overall
system pressure and control valve pressure difference is reduced.
The resulting water velocity across the valve seat is significantly
lower than if the pump were operating at constant, maximum speed.
This increases valve life, reduces maintenance effort and reduces
noise in the system.
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