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Roseville Skating Center and City Hall <br />Feasibility Study September23, 2007 <br />i r�. �}� <br />r <br />� :•nrm <br />s <br />�•� � <br />Increase in kWh for Cooling in City Hall / Public Safety Building <br />Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov dec <br />0 Elec (kWE�} <br />Figure 21: This graph shows the increased electrical consumption due to the cooling load of the <br />City Hall/Public SafetyBuilding. <br />Based on this information, cooling the City Hall / Public Safety Building consumes an <br />estimated 159,000 k�i annually. The manufacturer's specifications rate the air cooled <br />condensing unit at a Energy Efficiency Rating (EER) of 10.5. Several geothermal heat <br />pump equipment manufacturers publish E�R's ranging from 16 to 22. Based on this <br />information, the efficiency of geothermal heat pumps installed in this application would <br />reduce cooling energy consumption by 40% to 50%. Energy consumption would reduce <br />by approximately 71,000 kV� annually, with an energy cost saving of $.�.641 kWh, or a <br />total annual saving of approximately $4,580. <br />7. GREENHOUSE GAS (GHG) EMISSION REDUCTION <br />Greenhouse gases are emitted whenever fossil fuels are burned. For every therm <br />(hundred cubic feet) of gas that is burned, 11.772 pounds of C�2 is emitted to the <br />atmosphere. Most utilities burn a variety of fossil fuels such as coal, oil or natural gas to <br />produce electricity. The amount'of greenhouse gases emitted is based on the efficiency <br />of the generating station and the quality of the fuel that is burned to produce electricity. <br />According to figures published by the U.S. Environmental Protection Ar���7r��`, the <br />average fuel mix used in Minnesota generating stations produces 1.587 pounds of CO2 <br />for every kV� produced. <br />The following table shows the amount of natural gas and electricity consumed on the <br />City Hall Campus in 2006. <br />` United States Energy Information Administration, U.S. Department of Energy: Updated State <br />Level Greenhouse Gas Emission Factors for Electricity Generation, March, 2001 <br />Geo-Xergy Systems Page 21 of 33 <br />