In the previous note; Pump control in HVAC system – how to?, I mentioned about the two strategy to control the pumping system in partial-load when chilled water flowrate demand is reduced. In this note, I shows the pumping energy required for each strategy. With the simple visual from pump/system curve, you will see that using variable speed drive (VSD) to control pump speed at partial-load get more energy saving than modulating control valve with constant speed of pump(s).
Related notes:
Pump operating point and control curve for chilled water system (Closed loop)
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