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ECM 4: VFD UpoLades <br />CENTURY CENTER -AHU -1 Supply& Exhaust Fan <br />Install variable speed drives on AHU Fans: <br />37.5 ...TOTAL VAVFAN HORSEPOWER (FANHP) <br />70.0% ...COMBINED LOADING PERCENT OF ALL SUPPLY /RETURN FAN MOTORS (FANLOAL <br />85.0% ...COMBINED EFFICIENCY OF ALL SUPPLY/RETURN FAN MOTORS (FANEFF) <br />1 ...CURRENT VOLUME CONTROL (1 =CV, 2 =DD, 34v) <br />582Q ...TOTAL FAN RUNTIME HOURS (FANHRS) = HVACHRS *WPY <br />10% ...PERCENT OF HOURS OPERATION AT 100% (100 %HRS) <br />30% ...PERCENT OF HOURS OPERATION AT90 %(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 /H P) * FANLOAD *((FAN 100 -(1 00%6HRS * FANHRS)) + <br />(FAN90 * (90 %HRS * FANHRS))+ (FAN80 * (80 %HRS * FANHRS))+ <br />(FAN70 * (70 %HRS - FANHRS)) + (FAN60 * (60 %HRS * FANHRS)) + <br />(FAN50 * (50 %oHRS * FANHRS))) ________________ ___: 139,416 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))) _____ _________________ 87,012 KWH <br />52,404 KWH <br />101 <br />