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Roseville Skating Center and City Hall Feasibility Study September23, 2007 it will be appropriate to integrate the mechanical systems in this building with the Ice Arena system using the GHX to transfer energy. Since the cooling loads are significantly greater than the peak heating loads, it would also be beneficial to look at the potential of integrating a thermal ice storage system into the building as well. The current peak summertime peak electrical demand is approximately 240 kW. The cooling units account for an estimated 140 kW demand. By integrating thermal ice storage with an integrated geothermal system, it would be possible to reduce the peak summertime daytime electrical demand by 50 to 1�� kW. It will be beneficial to look at integrating the HVAC systems in this building with an integrated geothermal system as the maintenance costs in the existing system increase and the system requires replacement. The current energy cost for this building is approximately $110,500 annually, or approximately $1.63 per square foot. By simply installing a geothermal heating and cooling system in this building the estimated heating costs can be reduced by approximately $22,400 annually. The cooling cost can be reduced by an estimated $4,580 annually. By incorporating thermal ice storage into the cooling system, the peak electrical demand can be reduced by approximately 100 to 11 Q kW during the summer, reducing energy cost by approximately $1,000 per month for approximately 5 months, for an additional saving of approximately $5,000. Total energy cost savings are estimated at $32,000 annually. 9.3. Other Campus Buildings The mechanical equipment in the Banquet Hall, the Fire Hall and the gas boiler in the City Hall, however, are older, and may require maintenance and ! or replacement in the near future. While the simple payback to replace the refrigeration system in the ice arena is not immediate, this project can serve as the basis for a long-term plan to significantly reduce energy consumption, energy cost and greenhouse gas emissions from these facilities. The long-term plan should include: • A detailed mechanical equipment survey to estimate the lifesp�n of the existing equipment in each of the facilities, with a focus on the older equipment. * Consideration of future facilities planned by the City that could take advantage of the availability of thermal energy. Facilities such as an indoor or outdoor pool or other recreation facilities could see significant benefits in connecting to an integrated district system. • Consideration of the potential of private developers to connect other nearby facilities to an integrated system to take advantage of the thermal energy availablefrom the refrigeration plant. When additional facilities are connected to the GHX of the integrated system it may be advantageous to connect the refrigeration plant from the Speed Skating Oval to the system. By adding a water-cooled condenser to the refrigeration plant in parallel with the existing cooling tower it is possible to divert much of the thermal energy to a GHX. Depending on the heating and cooling loads of the other facilities that are connected to the GHX, it may be beneficial to add the thermal energy from the Oval to the GHX. Geo-Xergy Systems Page 28 of 33