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TCAAP Energy Integration Resiliency Framework <br />Energy Source Implementation <br /> <br /> <br /> 53 <br />3. Energy Escalation Rate Calculator - 2% inflation, start date is 2015, duration is 30 years. Annual energy escalation rate is <br />0.52% (Real) and 2.53% (Nominal). <br />4. Sales tax not applied to heating due to state heating fuels law. <br />5. Seasonal Energy Efficiency Ratio (Btu/Watt-hr) – the cooling output during a typical cooling season divided by the total <br />electric energy input during the same period. <br />6. Energy Efficient Ratio (Btu output/Watt input) – the ratio of output cooling energy (in Btu) to input electrical energy (in <br />W). <br />7. Coefficient of Performance – the ratio of output energy (in Btu or W) to input electrical energy (in the same units). <br />8. http://apps1.eere.energy.gov/buildings/publications/pdfs/building_america/highefficiency_gas_furnaces.pdf <br />9. http://www.waterfurnace.com/literature/3series/SC2300AL.pdf <br />10. http://www.homeadvisor.com/cost/heating-and-cooling/install-a-heat-pump/#, <br />http://home.costhelper.com/geothermal-heat-pump.html , Estimate for 4-loop heat pump provided by S&B Geothermal <br />(adjusted for economies of scale and 1 loop unit) <br />11. http://www.waterfurnace.com/literature/3series/SC2300AL.pdf <br />12. Heat pump to supply DHW to tank, electric element in tank as redundant source. <br />Table 20: Financial assumptions <br />Using the energy usage estimates prepared as part of this study, the Project Team estimated the <br />annual cost of providing heating and cooling to the areas homes under a traditional scenario <br />(independent high efficiency furnaces and AC units) and under a low-temperature district energy <br />scenario (energy transfer station, distribution system, heat pump HVAC units). The life cycle cost <br />analysis for the low-temperature district energy system, including the costs covered by the developer, <br />was compared to the traditional scenario. The 30-year costs include systems operation, maintenance, <br />and equipment replacement, but do not account for any profit for the district energy business. This <br />analysis is summarized in Table 21. <br /> <br />District Energy Life Cycle Cost Comparisons for Connected Homes <br /> Initial Cost 30-Year Cost Average Annual Costs Per Home <br />Traditional Service $ 2,733,192 $20,288,675 $1,715 <br />District Service $3,056,600 $18,482,181 $1,562 <br />District Service <br />Savings (Cost) $(323,408) $1,806,494 $153 <br />Table 21: District energy system life cycle cost comparison for all homes connected <br />As shown, the district system is lower in cost over the-30 year period than a traditional gas-fired <br />furnace and electric A/C unit; however, it is assumed that the benefits beyond the 30-year initial <br />agreement would be significantly greater as the debt payment for the initial system construction is <br />completed.