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<br />
<br />EXHIBIT D
<br />FACILITY OPERATING PARAMETERS &
<br />UTILITY SAVINGS CALCULATION METHODS
<br />Controls Modifications
<br />City Hall
<br />
<br />VFD - Control with VAV Boxes
<br />
<br />
<br />Energy Calculations - Variable Frequency Drives Optimization
<br />HVACHRS BASELINE PROPOSED SAVINGS
<br />
<br />Proposed Proposed Proposed Fan Energy Ventilation Cooling Fan Energy Ventilation Cooling Fan Energy Ventilation Cooling
<br />SUPPLY O.A. Measured Baseline Affected Proposed Baseline
<br />
<br />AHU # AREA SERVED CFM CFM KW Hrs/Wk Hrs/Wk Hrs/Wk % Flow S.F. CFM O.A. CFM % Flow KWH Therms KWH KWH Therms KWH KWH Therms KWH
<br />
<br />AHU-1 Offices 14,200 3000 8.95 84.70 85 55 70% 11,881 3,000 70% 13,524 1,057 12,121 8,782 686 7,871 4,742 370 4,250
<br />
<br />AHU-2 Councle Chambers 3,500 1700 1.79 92.00 92 60 70% 2,928 1,700 70% 2,938 650 7,460 1,916 424 4,866 1,022 226 2,595
<br />
<br />AHU-3 Workout 2,400 1200 1.79 168.00 168 85 100% 2,400 1,200 100% 15,641 2,444 9,617 7,914 1,237 4,866 7,727 1,207 4,751
<br />
<br />AHU-4 Offices 11,000 3000 5.97 96.50 97 55 70% 11,000 3,000 70% 10,272 1,204 13,810 5,854 686 7,871 4,417 518 5,939
<br />
<br />AHU-6 Offices 2,750 302 3.82 97.25 97 55 70% 2,750 302 70% 6,632 122 1,401 3,751 69 792 2,881 53 609
<br />
<br />TOTAL 49,006 5,477 44,408 28,216 3,102 26,265 20,790 2,375 18,144
<br />
<br />
<br />
<br />Assumptions
<br />
<br />VARIABLES CALCULATIONS
<br />See Table Above ...PRESENT HRS/WK OF SYSTEM OPERATION (HVACHRS) PROPOSED O.A. CFM
<br />0 ...HRS/WK OF SCHEDULED FOR WARMUP/COOLDOWN (WUCD) Fan Law #2: S.P.n/S.P.o = (CFMn/CFMo)^2
<br />52 ...WKS/YR OF AIR SYSTEM OPERATION (WPY)
<br />therfore: CFMn = CFMo * SQRT(S.P.n/S.P.o)
<br />See Table Above …Measured KW / Data Logger KW (FANKW) PROPOSED KW
<br />...ELECTRICITY UNIT ($) COST/KWHR (ELECCOST) Fan Law #3 BHPn/BHPo = (CFMn/CFMo)^3 (BHP is proportionate to KW); CFMn=CFMo * (S.P.n / S.P.o)
<br />4977 ...HEATING HRS/YR FROM WEATHER DATA (HHPY) therfore: (CFMn/CFMo)^3 = KWn/Kwo
<br />See Table Above ...TOTAL SUPPLY FAN CFM (CFM) FAN ENERGY (KWH/YR.)
<br />See Table Above …TOTAL OA CFM (OACFM) Basseline = (WINTER KW * HVACHRS * (HHPY/168)) + (SUMMER KW * HVACHRS * (52-(HHPY/168)))
<br />62 ...UNOCCUPIED HRS. SPACE HEATING SETPOINT (HTSPUNOC) Proposed = (PROPOSED WINTER KW * HVACHRS * (HHPY/168)) + (PROPOSED SUMMER KW * HVACHRS * (52-(HHPY/168)))
<br />27.9 ...AVERAGE O.A. TEMP. DURING HEATING SEASON (AVEDBT)
<br />FAN ENERGY COST ($/YR.)
<br />...$/BTU COST OF HEATING ENERGY (HEATCOST)
<br />= FAN ENERGY * ELECCOST
<br />0.9 …BOILER EFFICIENCY (BTU)
<br />VENTILATION (BTU/YR.)
<br />1.4 …CHILLER EFFICIENCY IN KW/TON (KWTON)
<br />Basseline = ((BIN-DELTA T-HRS) * OACFM * 1.08) + (0.4 * (BIN-DELTA T-HRS) * TOTAL-CFM * 1.08)
<br />2462 ...COOLING HRS/YR FROM WEATHER DATA (CHPY)
<br />Proposed = ((BIN-DELTA T-HRS) * PROPOSED OACFM * 1.08) + (0.4 * (BIN-DELTA T-HRS) * PROPOSED TOTAL-CFM * 1.08)
<br />14.7 ...COOLING WEEKS PER YEAR (CWPY) = (CHPY/168)
<br />VENTILATION COST ($/YR.)
<br />6.2 …COOLING ENTHALPY DELTA (ENTHALPY) 55
<br />= VENTILATION COST * HEATCOST
<br />…MIXED AIR TEMPERATURE SETPOINT (MAT)
<br />COOLING (KWH/YR.)
<br />
<br />Basseline = (HVACHRS * CWPY * OACFM * 4.5 * ENTHALPY / 12,000) * KWTON
<br />Proposed = (HVACHRS * CWPY * PROPOSED OACFM * 4.5 * ENTHALPY / 12,000) * KWTON
<br />COOLING COST ($/YR.)
<br />= COOLING COST * ELECCOST
<br />
<br />
<br />VFD - Control with VAV Boxes
<br />
<br />
<br />Energy Calculations - Variable Frequency Drives Optimization
<br />HVACHRS BASELINE PROPOSED SAVINGS
<br />
<br />Proposed Proposed Proposed Fan Energy Ventilation Cooling Fan Energy Ventilation Cooling Fan Energy Ventilation Cooling
<br />SUPPLY O.A. Measured Baseline Affected Proposed Baseline
<br />
<br />AHU # AREA SERVED CFM CFM KW Hrs/Wk Hrs/Wk Hrs/Wk % Flow S.F. CFM O.A. CFM % Flow KWH kWh KWH KWH kWh KWH KWH kWh KWH
<br />
<br />AHU-7 Offices - Elec 14,000 3000 16.13 100.50 101 55 70% 14,000 3,000 70% 28,917 33,068 4,933 15,825 18,097 2,700 13,092 14,971 2,233
<br />
<br />TOTAL 28,917 33,068 4,933 15,825 18,097 2,700 13,092 14,971 2,233
<br />
<br />
<br />
<br />Assumptions
<br />
<br />VARIABLES CALCULATIONS
<br />See Table Above ...PRESENT HRS/WK OF SYSTEM OPERATION (HVACHRS) PROPOSED O.A. CFM
<br />0 ...HRS/WK OF SCHEDULED FOR WARMUP/COOLDOWN (WUCD) Fan Law #2: S.P.n/S.P.o = (CFMn/CFMo)^2
<br />52 ...WKS/YR OF AIR SYSTEM OPERATION (WPY)
<br />therfore: CFMn = CFMo * SQRT(S.P.n/S.P.o)
<br />See Table Above …Measured KW / Data Logger KW (FANKW) PROPOSED KW
<br />Fan Law #3 BHPn/BHPo = (CFMn/CFMo)^3 (BHP is proportionate to KW); CFMn=CFMo * (S.P.n / S.P.o)
<br />...ELECTRICITY UNIT ($) COST/KWHR (ELECCOST)
<br />4977 ...HEATING HRS/YR FROM WEATHER DATA (HHPY) therfore: (CFMn/CFMo)^3 = KWn/Kwo
<br />See Table Above ...TOTAL SUPPLY FAN CFM (CFM) FAN ENERGY (KWH/YR.)
<br />See Table Above …TOTAL OA CFM (OACFM) Basseline = (WINTER KW * HVACHRS * (HHPY/168)) + (SUMMER KW * HVACHRS * (52-(HHPY/168)))
<br />62 ...UNOCCUPIED HRS. SPACE HEATING SETPOINT (HTSPUNOC)
<br />Proposed = (PROPOSED WINTER KW * HVACHRS * (HHPY/168)) + (PROPOSED SUMMER KW * HVACHRS * (52-(HHPY/168)))
<br />27.9 ...AVERAGE O.A. TEMP. DURING HEATING SEASON (AVEDBT)
<br />FAN ENERGY COST ($/YR.)
<br />...$/BTU COST OF HEATING ENERGY (HEATCOST)
<br />= FAN ENERGY * ELECCOST
<br />0.9 …BOILER EFFICIENCY (BTU)
<br />VENTILATION (BTU/YR.)
<br />1.4 …CHILLER EFFICIENCY IN KW/TON (KWTON)
<br />Basseline = ((BIN-DELTA T-HRS) * OACFM * 1.08) + (0.4 * (BIN-DELTA T-HRS) * TOTAL-CFM * 1.08)
<br />2462 ...COOLING HRS/YR FROM WEATHER DATA (CHPY)
<br />Proposed = ((BIN-DELTA T-HRS) * PROPOSED OACFM * 1.08) + (0.4 * (BIN-DELTA T-HRS) * PROPOSED TOTAL-CFM * 1.08)
<br />14.7 ...COOLING WEEKS PER YEAR (CWPY) = (CHPY/168)
<br />VENTILATION COST ($/YR.)
<br />6.2 …COOLING ENTHALPY DELTA (ENTHALPY) 55
<br />= VENTILATION COST * HEATCOST
<br />…MIXED AIR TEMPERATURE SETPOINT (MAT)
<br />COOLING (KWH/YR.)
<br />
<br />Basseline = (HVACHRS * CWPY * OACFM * 4.5 * ENTHALPY / 12,000) * KWTON
<br />Proposed = (HVACHRS * CWPY * PROPOSED OACFM * 4.5 * ENTHALPY / 12,000) * KWTON
<br />COOLING COST ($/YR.)
<br />= COOLING COST * ELECCOST
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<br />EXHIBIT D Page 18 of 27
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