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Roseville Skating Center and City Hall Feasibility Study September23,2007 Iniegrating ice storage in this manner reduces the peak electrical draw in the Banquet Hall by approximately 25 to 50 kVV depending on the capacity of the thermal ice storage tanks. In addition to the peak demand reduction, the amount of equipment that must be installed and maintained is reduced.' Bergerson Caswell [nc. is a drilling company specializing in the installation of vertical GHX systems. This company has installed vertical GHX systems in the Minneapolis area, and has indicated that a vertical GHX can be installed for approximately$11 to $12 per foot (including piping to and from the buildings, fluid, etc.) An estimate of the size of the GHX large enough to accommodate the loads for the ice Arena ! Banquet Hall facility is a vertical GHX with approximately 50 boreholes to a depth of 200'. The total estimated cost of the GHX is $120,000. The following chart summarizes the estimated costs for Options � and 2 for the Ice Arena / Banquet Hall Figure 22: Shows a comparison between Option 1 and Option 2. There is an estimated cost difference of approximately $421,000. Note that option 2 provides for the replacement of the rooftop units as well as the addition of the GHX, and includes the cost of a thermal storage buffer underthe floor. Arena Dehumidification The existing dehumidification equipment in the ice arena appears to be operating effectively, and appears to be well maintained. When major repairs and maintenance is required for this equipment, it will be possible to integrate the dehumidification, heating, cooling and ventilation requirements of the ice arena into an integrated unit that makes use of the refrigeration and waste heat recovery capability of an integrated system. Maintenance Cost Comparison &. System Longevity A conventional refrigeration system is considered industrial equipment. It is designed for long-term, heavy usage. Most facilities develop a regularly scheduled maintenance program to ensure the longevity and efficiency of the equipment. Several facility operators in the United States and Canada have reported that they allow an annual budget of $12,000 to $16,000 for maintenance such as rebuilding of compressor units, replacement or repair of the cooling tower, testing and maintaining the secondary refrigerant fluid, repair of a chiller barrel, etc. Over twenty integrated geothermal ice rink systems have been installed in the U.S. and Canada before the year 2000. Their experience has shown significantly lower annual � ice Kube Systems: "Integrated Geothermal lce Storage Systems"- Ed Lohrenz, June 2005 Geo-Xergy Systems Page 25 of 33