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Roseville Skating Center and City Hall <br />FeasibilityStudy September23, 2007 <br />Fire Hall Energy Consumption (2006) <br />ec n-.c •-• --• - <br />� � ' <br />� �• <br />� -- <br />::�w •- ' _— <br />•}'� • - <br />� <br />~*'-� <br />� <br />� <br />Jan Feb M a Apr May .kxi ,ki1 Aug Sep Oct h.i �t <br />—c�—Efec(kWh) °�<3-�Gas(EkWh) <br />Figure 13: This graph shows the e/ectric and natural gas consumption in 2006 for the Fire Hall in <br />k�l�� and EkWh <br />4. POTENTIAL FOR HEAT RECOVERY FROM REFRIGERATION PLANT <br />A refrigeration plant in an ice arena is designed to extract thermal energy from the ice <br />surface. In most ice arenas the thermal energy taken from the ice is dissipated to the <br />outdoor air through a cooling tower. Most refrigeration plants use one unit of electrical <br />energy to operate the compressnr{s), circulating pumps, fans and other auxiliary <br />equipment to extract 1.5 to 2.0 units of thermal energy from the ice surface. <br />All of the electrical energy used to operate the refrigeration equipment plus all the <br />thermal energy extracted from the ice surface is dissipated to the cooling tower. That <br />means that for every 1,000 k�l,�h of electricity consumed by the refrigeration plant, an <br />additional 1,500 to 2,000 kV�f� of thermal energy is extracted from the ice surface and a <br />Geo-Xergy Systems Page 12 of 33 <br />