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CENTURY CENTER -Hot Water Pumps <br />Install variable speed drives on Hot Water Pumps: <br />60 ...TOTAL HW PUMP HORSEPOWER (HWPHP) <br />80.0% ...COMBINED LOADING PERCENT OF ALL HW PUMP MOTORS (HWPLOAD) <br />85.0% ...COMBINED EFFICIENCY OFALL HW /CW PUMP MOTORS(HWPEFF) <br />3,725 " ... TOTAL PUMP RUNTIME HOURS (PUMPHRS = HVACHRS /168 *HHPY) <br />15% ...PERCENT OF HOURS OPERATION AT 100 % (100 %HRS) <br />30% ...PERCENT OF HOURS OPERATION AT 90% (90 %HRS) <br />25% ...PERCENT OF HOURS OPERATION AT 80 % (80 %HRS) <br />20% ...PERCENT OF HOURS OPERATION AT 70% (70 %HRS) <br />10% ...PERCENT OF HOURS OPERATION AT 60% (60 %HRS) <br />0% ...PERCENT OF HOURS OPERATION AT 50% (50 %HRS) <br />0% ...PERCENT OF HOURS OPERATION AT 40% (40 %HRS) <br />0% ...PERCENT OF HOURS OPERATION AT 30% (30 %HRS) <br />100% ...SUM OF PERCENT OF HOURS OPERATION <br />(Current) (HWPHP *0.746 KW/H P/HWPEFF)*HWP LOAD *PU MPH RS 156,915 KWH <br />(Retrofit) (HWPHP /HWPEFF *.746 KW /HP) *HWPLOAD *((1.0 *(100 %HRS *HWPHRS))+ <br />(.9A2.5 * <br />(90 %oHRS* <br />HWPHRS))+ (,842.5 * <br />(80 %HRS * HWPHRS))+ <br />(.7A2.5 - <br />(70 %HRS * <br />HWPHRS)) + (.6A2.5 * <br />(60 %HRS * HWPHRS)) + <br />(.5A2.5 * <br />(50 %HRS * <br />HWPHRS)) + (AA2.5 * <br />(40 %oHRS * HWPHRS)) + <br />(.3A2.5 *(30% <br />oHRS *HWPHRS)))__ <br />_________________ 99,408 KWH <br />57,507 KWH <br />105 <br />