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Power consumption of water pump: None >
VFD only > VFD with controller
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> VFD
with parallel connection controller.
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None = No energy saving device
installed.
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VFD only = Only VFD (variable frequency device)
installed.
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VFD with controller = VFD installed, and controlled by a
controller.
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VFD with parallel connection
controller = VFDs installed (parallel connection), and controlled by a
special
controller.
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Power consumption of water pump = I + II-1
+ II-2 +
III-1~2.
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Energy saving by VFD only
= III-1~2 (over
design).
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Energy saving by VFD with controller = II-1 + II-2 +
III-1~2.
Parallel
connection control:
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The original design: two water pumps, one
is ON at full speed, the other is OFF as a spare
pump.
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The parallel connection design: after
installing our system, two water pumps are ON at 50%
speed.
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The original design
supplies water Q by consuming power P.
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By new design, speed of two
pumps is reduced to 50%. Therefore, each pump can supply water 0.5Q,
and two pumps supply water Q (0.5Q x 2), same as the original
design.
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When speed is reduced to
50%, power consumption will be reduced to 12.5% (50% x 50% x
50%).
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After installing our
system, two pumps consume 0.125P
x 2 = 0.25P. Comparing to original power consumption P, we can save up to 75% of total power
consumption.
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