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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% ...COMB IN ED LOADIN G PERCENT OF ALL SUPPLY /RETURN FAN MOTORS (FAN LOAD) <br />85.0% ...COMBINED EFFICIENCY OF ALL SUPPLY /RETURN FAN MOTORS (FAN EFF) <br />1 ...CURRENT VOLUME CONTROL (I =CV, 2 =DD, 3 =IV) <br />5824 " ... TOTAL FAN RUNTIME HOURS (FANHRS) = HVACHRS *WPY <br />10% — PERCENT OF HOURS OPERATION AT 100% (1 00%HRS) <br />30% ...PERCENT OF HOURS OPERATION AT 90% (90 %HRS) <br />20% ...PERCENT OF HOURS OPERATION AT 80% (80 %HRS) <br />20% ...PERCENT OF HOURS OPERATION AT 70% (70 %HRS) <br />15% ...PERCENT OF HOURS OPERATION AT 60% (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 *FAN HRS)) +(FAN 80 * (80 %HRS * FANHRS)) + <br />(FAN70 * (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 * FANHRS))) ______________________ 394,456 KWH <br />219,044 KWH <br />103 <br />