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CENTURY CENTER -AHU- 2,3,4,5 & 6 Supply& Exhaust Fans <br />Install variable speed drives on AHU Fans: <br />190 ...TOTAL VAVFAN HORSEPOWER ( FANHP) <br />70.0% ...COMBINED LOADING PERCENT OF ALL SUPPLY/RETURN FAN MOTORS (FANLOAC <br />85.0% ...COMBINED EFFICIENCY OF ALL SUPPLY /RETURN FAN MOTORS (FANEFF) <br />1 ...CURRENT VOLUME CONTROL (1 =6V, 2 =DD, 3 =1V) <br />5824 ...TOTAL FAN RUNTIME HOURS (FANHRS) = HVACHRS *WPY <br />10% ...PERCENT OF HOURS OPERATION AT 100% (100 %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*. 746KW/HP) *FANLOAD *((FAN100'(100 %HRS *FANHRS))+ <br />(FAN90 * (90 %HRS' FANHRS)) +(FAN80 * (80 %HRS' FANHRS))+ <br />(FAN70 * (70 %HRS' FANHRS)) +(FAN60 * (60 %HRS' FANHRS))+ <br />(FAN50 - (50 %HRS * FANHRS))) ___________________: 685,060 KWH <br />(Retrofit) (FANHP /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))) ______________________ 440,862 KWH <br />244,198 KWH <br />102 <br />