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ECM 4: VFD Upgrades <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, 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 -.746 KW/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 %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 />