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Roseville Skating Center and City Hall Feasibility Study September 23, 2007 total of 2,500 to 3,000 f�V�� of thermal energy is dissipated to the outside air through the cooling tower. The thermal energy normally dissipated to the air has value if it can be captured and used for space heating or to produce hot water for use in the arena or one of the other nearby buildings. 4.1. Ice Arena and Banquet Hall The ice arena consumes approximately 1,090,500 kV�l�i of electricity and an additional 844,300 EkWh of natural gas annually to provide refrigeration for the ice surface, space conditioning and hot waterfor the building. Studies by Natural Resources Canada (NRCan) have shown that approximately40% to 45% of the total energy consumed in a typical ice arena (electricity and natural gas) is used to operate the refrigeration plant' in a typical ice arena, and that a typical ice arena consumes a combined total of 1,200,000 to 1,500,000 f�� / EkWh annually. Since this building includes a significant amount of space not normally included in a typical ice arena, it is estimated that 30% to 35% of the total building energy consumption in this building is used to operate the refrigeration plant. The total k�JYh consumption of the refrigeration plant in this facility is estimated at (1,087,000 � 830,000) x 33% = 632,000 [cWh. This correlates well with the research done by NRCan and with similar studies completed by Geo-Xergy Systems. The amount of thermal energy dissipated from the ice arena is estimated to be between 1,580,000 and 1,896,000 kW over the year (5,390,960,000 to 6,469,152,000 Btu) 4.2. Speed Skating Oval The electrical energy consumption at the speed skating oval totals approximately 860,000 kV,lf7 annually. The base electrical load for this facility totals approximately 5,000 kV�Jt7 per month or approximately60,000 kSJVf'ti annually. The electrical consumption of the refrigeration plant (compressors, pumps and cooling tower totals approximately 800,000 ktil�h annually. If the refrigeration plant is assumed to operate at a coefficient of perFormance of 2.5 to 3.0, then it rejects an estimated 2,000,000 to 2,400,000 kV� annually to the outdoor air through the cooling tower. 5. SYSTEM INTEGRATION WITH OTHER CAMPUS BUILDINGS The integration of the refrigeration system in the [ce Arena with the mechanical systems in the Ice Arena I Banquet Hall facility and the mechanical systems in the other campus buildings provides a significant opportunity to reduce energy consumption and energy cost. The connection of the refrigeration system in the Speed Skating Oval to an ' Natural Resources Canada (NRCan): "Guidelines for Energy Efficient and Environmentally Fnendly Ice Rinks for Owners, Managers and Municipal Officrals" - CANM�T Technology Centre, Varennes, QC_ Marius Lavoie - November 22, 2005 Geo-Xergy Systems Page 13 of 33