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Natural Gas End-Use Breakdown <br /> Natural gas consumption consists of end-uses of heating and domestic hot water heating. Figure 6 <br /> outlines the annual natural gas consumption by end-use for the proposed system as a percentage of the <br /> estimated total annual gas consumption. <br /> Domestic Hot <br /> �_ A%L'ater <br /> �nq.0 <br /> _ <br /> � <br /> � $(S.ti:C' I <br /> 4",-' : <br /> T� � ��fi':IU11� �-�,..,c.a: � <br /> i�V'U � <br /> a x E ,P1 ! <br /> � <br /> I <br /> � <br /> Figure 6. Natural Gas End-Use Breakdown of Geothermal Hl/AC w/HX <br /> Environmental Impact <br /> As part of this study, the reduction in carbon dioxide pollutants is considered. The carbon dioxide <br /> emissions are calculated based upon consumption from the existing systems and proposed geothermal <br /> system energy models. The pounds of carbon dioxide produced were calculated based on the energy use <br /> modeled and the geographic location of the building'. Table 6 gives the tons of carbon dioxide produced <br /> annually and over a 20-year lifetime by each of the three systems and the savings versus the existing <br /> system. This proposed system would provide a savings of 48 tons of COZ per year. <br /> Ta,ble 6. Annual and Lifetime Carbon Footprint <br /> � � • � « � e � • <br /> • � f � � <br /> „ r <br /> � � � <br /> High Efficiency Furnace System 153 1,836 44 22% <br /> Geothermal HVAC w/Well Field 137 1,644 60 30% <br /> Geothermal HVAC w/HX 134 1,608 63 32% <br /> ' Greenhouse Gas Emissions for electrical and natural gas consumption are based upon calculations from the EPA <br /> found at http://www.epa.gov/rdee/energy-resources/calculator.html. <br /> 005.10.01 Page 13 of 18 City of Orono <br /> May 28,2010 Geothermal HVAC Feasibility Study <br /> engineers � consultants � commissioning <br /> MEP Associates, LLC� 7607 Equitable Drive,Eden Prairie,MN 55344�phone:952.224.4488 fax:952.224.4489�www.mepassociates.com <br />