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Century Center - Chilled Water Pumps <br />Install variable speed drives on CWS Pumps: <br />900 ...TOTAL CHW SECONDARY PUMP HORSEPOWER (CHWPHP) <br />900.0% ,..COMBINED LOADING PERCENT OF ALL CHW PUMP MOTORS (CHWPLOAD) <br />85.0% ... COMBINED EFFICIENCY OF ALL CHW PUMP MOTORS (CHWPEFF) <br />2,739 ...TOTAL PUMP RUNTIME HOURS (PUMPHRS = HVACHRS /168*CHPY) <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 />90% ... 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) (CHWPHP *0.746 KW/HP /CHWPEFF) *CHWPLOAD *PUMPI 240,405 KWH <br />(Retrofit) (CHWPHP /CHWPEFF *.746 KW /HP) *CHWPLOAD *((1.0 *(100 ° /aHRS *CHWPHRS))+ <br />(.9A2.5 * (90 %HRS * CHWPHRS)) + (.8A2.5 * (80 %HRS * CHWPHRS)) + <br />(.7 ^2.5 * (70 %HRS * CH WPHRS))+ (.6A2.5 * (60 %HRS * CHWPHRS)) + <br />(.5A2.5 * (50 %HRS * CHWPHRS)) + (AA2.5 * (40 %HRS * CHWPHRS)) + <br />(.3 -2.5 * (30 %HRS * CH WPHRS))) _________________= 152,301 KWH <br />88,104 KWH <br />104 <br />