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WaterHot Water to High Eff Hot from Converstion <br /> <br />EXHIBIT D <br />FACILITY OPERATING PARAMETERS & <br />UTILITY SAVINGS CALCULATION METHODS <br />City Hall Boiler Replacement: <br />Boiler Upgrade <br />City Hall Boiler Plant Replacement <br /> <br />Energy Calculations - Boiler Plant Replacement and Sequence of Operation Optimization <br /> <br /> <br />BASELINE PROPOSED SAVINGS <br /> <br />Heating Heating Heating <br />Total Gas Usage Existing Average Proposed Average Plant Proposed Average Plant <br /> <br />Facility Avg Therms Plant Efficiency Efficiency Increase Efficiency Therms Therms Therms <br />23,458 50.5% 25.6% 76.1% 23458.0 15566.1 7891.9 <br />City Hall <br /> <br />TOTAL 23458.0 15566.1 7891.9 <br /> <br /> <br />Assumptions <br /> <br /> <br />VARIABLES CALCULATIONS <br />...Total Gas Usage (2005) Therms (USAGE1) PROPOSED PLANT EFFICIENCY (EFF2) <br />See Table Above <br /> <br />See Table Above ...Existing Average Plant Efficiency (estimated) (EFF1) = EFF1+EFFinc <br /> <br />25.6% ...Proposed Average Plant Efficiency Increase (EFFinc) <br />...$/1000000 BTU COST OF HEATING ENERGY (HEATCOST) <br />BASELINE MBTU <br /> <br />10 …Therms/MBTU (CONV) <br />= USAGE1/CONV <br />PROPOSED PLANT USAGE (MBTU) <br /> <br />= USAGE1*EFF1/EFF2 <br />PLANT USAGE SAVINGS (MBTU) <br />= USAGE1 - USAGE2 <br /> <br />Eliminating the pumps in the penthouse <br /> <br /> <br />Penthouse Pumps <br />0.8 BHP <br />0.60 kW <br />52.8 GPM <br />100% % Reduction <br />0 New GPM <br /> <br /> <br /> <br />Savings <br />0.60 kW <br />5040 Hrs <br />7 Months <br />3,006.66 kWh <br /> <br />4.18 Total kW <br />3,006.66 Total kWh <br /> <br />Note: 0.75 kW/HP <br />EXHIBIT D Page 13 of 27 <br /> <br />