CWFRCenter for Work and Family Research (Penn State University)
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where CWFR is the ratio of desired CW flow setpoint to the design CW flow.
Optimum staging for variable speed CW pumps was found to correlate very well to CW flow with 60% of the total design flow as the staging point, i.e., one pump should operate when the CWFR is below 60% and two pumps should operate when CWFR is above 60%, with a time delay to prevent short cycling.