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Century Center • AHU -8,10, 11 Supply & Exhaust Fans <br />Install variable speed drives on AHU Fans: <br />170 ...TOTAL VAV FAN HORSEPOWER (FANHP) <br />70.0% ...COMBIN ED LOADING PERCENT OF ALL SUPPLY /RETURN FAN MOTORS(FANLOAD) <br />85.0% ...COMBINED EFFICIENCYOF ALL SUPPLY /RETURN FAN MOTORS(FANEFF) <br />1 ...CURRENT VOLUME CONTROL (I =CV, 2 =DD, 3 =1V) <br />5824:... TOTAL FAN RUNTIME HOURS (FANHRS) = HVACHRS *WPY <br />10% ...PERCENTOF HOURS OPERATION AT 100% (100 %HRS) <br />30% ...PERCENT OF HOURS OPERATION AT 90% (90 %HRS) <br />20% ...PERCENT OF HOURS OPERATION AT80 %(80 %HRS) <br />20% ...PERCENTOF HOURS OPERATION AT 70 %(70 %HRS) <br />15% ...PERCENT OF HOURS OPERATION AT60% (60 %HRS) <br />5% ...PERCENT OF HOURS OPERATION AT 50% (50 %HRS) <br />100% ...SUM OF PERCENT OF HOURS OPERATION <br />(Current) (FANHP /MOTOREFF *.746 KW /HP)`FANLOAD *((FAN 100`(100 %HRS *FANHRS))+ <br />(FAN90 ` (90 %HRS * FANHRS)) + (FAN80 * (80 %HRS * FANHRS)) + <br />(FAN 70 ` (70 %HRS * FANHRS)) + (FAN60 * (60 %HRS * FANHRS)) + <br />(FAN50 ` (50% HRS ` FANHRS))) 613,500 KWH <br />(Retrofit) (FAN HP/ MOTOREFF *.746 KW/HP) * FANLOAD * ((1.0 * (100 %HRS ` FANHRS)) + <br />(.82 ` (90 %HRS ` FANHRS)) +(.65 * (80 %HRS' FANHRS))+ <br />(.51 * (70 %HRS * FANHRS)) +(.38 * (60 %HRS * FANHRS)) + <br />(.27 * (50 %HRS ` FAN HRS))) _____________________= 394,456 KWH <br />219,044 KWH <br />103 <br />