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Roseville Skating Center and City Hall <br />Feasibility Study September 23, 2007 <br />IFire Wall Energy �a��aa&���bt��a #20dD6} <br />N a�: — - – -_ . <br /><r: r..- <br />, <br />.� � <br />:�i�x�: - - - --• -•-• — — - <br />{{. � <br />� �. <br />rY � <br />. I <br />-L ri , , . I <br />. � ���� �- ^���� , <br />� �� � <br />---..� -- - -- ' � -- � � � <br />Jan Fe6 fs'S' Apr May Jixi J� Aug Sep Oct Nav i7ec <br />� � Elec (kW�) �• O - Gas (EkWh) <br />2 Figure 13: This graph shows the electric and natural gas consumption in 2006 for the Fire Hall in <br />3 kWh and EkWh <br />4 <br />;�.•-:, - �— � — <br />�ec- .. — �� <br />' I <br />���: � — : �I <br />��,�� � - <br />.'< r �- -�- . <br />ii0a k � � — — <br />.h. , O <br />.. . • # ¢ I <br />�}' � { .}v +� f /g{� <br />V� �% � �•� � f�e �l> • x <br />F'. • .. <br />Jan Feb Niar Apr May .lun Jul Aieg Sep Ocf FLx• 'i-r. _ <br />� 0 Elec 0 Gas <br />6 Figure 14: This graph shows the energy cost in 2006 for the Fire Halt <br />� <br />8 �. ��T�,IT��4� F�R i�E�kT RE��Y�R� F��Rd RE�I�ERATT�� R��I�� <br />� <br />1� A refrigeration plant in an ice arena is designed to extract thermal energy from the ice <br />� 1 surface. In most ice arenas the thermal energy taken from the ice is dissipated to the <br />�2 outdoor air through a cooling tower. Most refrigeration plants use one unit o� electrical <br />13 energy I o operate the compressor(s)t circulating pumps, fans and other auxiliary <br />t4 equipment to extract 1.5 to 2.0 units of thermal energy from the ice surface. <br />'. 5 <br />�6 All of fhe electrical energy used to operate the refrigeration equipment plus all the <br />17 thermal energy extracted from the ice surface is dissipated to the cooling tower. That <br />�g means that for every 1,000 kV�'h of electricity consumed by the refrigeration plant, an <br />19 additional 1,500 to 2,000 k�l��11 of thermal energy is extracted from the ice surface and a <br />Geo-Xergy Systems Page 12 of 33 <br />