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Roseville Skating Center and City Hall <br />Feasibility Study September 23, 2007 <br />approximately balanced by the energy dissipated to the air through the Ice Arena and <br />Speed Skating Oval cooling towers. Figure 20 shows the approximate energy balance. <br />Annual Energy Balance <br />� ti7or�' I ---- —� ---. _ . � <br />3�� • --• • _.�.�...�V��_': <<.. _ _.. <br />.. > ?�7���' s �''• ;�� <br />.x•M1 .�Y..$ � � <br />y �'! ' A..� ;�;Y'� ,� x'1 <br />{ •. '� � <br />2�C70QOQ6 --' " � o� :,�.'�� . . _ ... _ � � ��' f � �:.�! I . . . <br />��. <br />. '°{•,r�� f:.�:•', £�S°� ':`Xk` �g, <br />. ;� �� <br />l.' �. ..J}Y..•{F� I?•�rY$�:1�:� �' . <br />��`� {��}.;�•',f^y•• i•:,�• ��s ��. --.. <br />� � �•'f . '`•"r•� t��;. >� z?'••�; <br />1,066,06{� �T•..{{v•,c� �{c..::: •x.�''. .l{yti.: �G. . <br />ao ���'� �� ' �'�,: •': ;�I �r� . • •;� N �'h'•'< '� <br />,�•" <br />�'� V. • �„�?'• ' y�. . .' ¢. �. �� r l . l�y�:.' <br />� .�C° •:f r• <br />a '�::�'� ':" " �� :, I P%. � x,.•' .�: �•�v'`.,� . <br />„ {'•• o..•°v�l;{ . c.•r� . <br />Thermal Energy Dissipated by ice Arena Cooling iower Thermal Energy Required for Space 8� Water Heating <br />Figure 20: If all the buildings on the City Hall Campus are connected to an integrated mechanical <br />system the overaf! energy ba/ance is within 12% fo 14%. <br />6. POTENTIAL ENERGY COST REDUCTION BY INTEGRATION <br />An integrated system recovers and reuses energy that is normally dissipated to the <br />outside air. On the City Hall Campus there is an opportunity to recover energy from the <br />refrigeration systems of the fce Arena and the Speed Skating Oval. This is possible <br />because there are large heating requirements in several of the buildings at the same <br />time the refrigeration systems are being heavily used. The refrigeration plant in the ice <br />arena operates year round, and there are heating loads in all of the campus buildings for <br />at least 6 to 8 months of the year, while the large refrigeration plant connected to the <br />Speed Skating Oval operates only during the coldest months when the demand for <br />heating is the greatest. <br />By connecting the refrigeration systems to a GHX it is possible to accommodate <br />temporary energy imbalances by storing thermal energy in the ground by simply allowing <br />it to become slightly warmer or cooler. The large mass of the earth can store large <br />amounts of thermal energy. <br />In the last two years the five facilities on the City Hall Campus have used an average of <br />3,295,900 kV�F� of electricity and 108,900 CCF (3,191,300 �kWh) per year. The following <br />table shows the current energy consumption and cost for each of the buildings. <br />Geo-Xergy Systems Page 19 of 33 <br />