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Roseville Skating Center and City Hall <br />Feasibility Study September 23, 2007 <br />8. CAPITAL COST <br />8.1. Ice Arena / Banquet Hall <br />The Ice Arena was built in 1969, and is a heavily used facility. The current refrigeration <br />system was installed in 1980. It is a direct-expansion R22 refrigeration system that is <br />designed to circulate a large volume of R22 refrigerant directly through steel tubing in <br />the sand surface of the rink floor. Since R22 refrigerant is classified as an HCFC and is <br />to be replaced according the Montreal Protocol agreement, the City of Roseville will be <br />replacing the refrigeration system in 2008. The City is considering two options to replace <br />the refrigeration system <br />Option One <br />Option one includes replacing the steel tubing that is used to circulate R22 refrigerant <br />through the floor with one inch diameter polyethylene piping. The new plastic piping <br />allows the circulation of chilled fluid through the floor. With this option the existing <br />compressors will be maintained and the system modified to chill fluid that is circulated <br />through the new plastic floor piping. The outdoor condenser will be replaced with this <br />option as well. The cost of this option was quoted at approximately $452,000 in 2006. <br />With this option one, the existing dehumidification system would be left in place, as <br />would the existing rooftop heating / cooling units. The serial numbers on the rooftop units <br />indicate they were manufactured in approximately 1998, with the exception of one unit <br />that was replaced in 2002. <br />Option Two <br />Option two includes the replacement of the existing refrigeration system with modular <br />chillers. The modular chillers form the nucleolus of an integrated heating, ventilation, air <br />conditioning and refrigeration system. <br />This option also includes the replacement of the existing steel refrigerant tubing in the <br />floor with high-density polyethylene piping, similar to option one, but includes the <br />construction of a"thermal storage buffer" under the floor. <br />The "thermal storage buffer" incorporates a layer of compacted granular material directly <br />beneath the ice surface. Insulation is placed approximately 18-20 below the concrete <br />and a grid of pipe to allow the circulation of warm water is placed below the insulation to <br />prevent the earth below the ice surface from freezing. The large mass of the thermal <br />storage buffer located directly underneath the floor helps maintain the ice surface in the <br />Geo-Xergy Systems Page 22 of 33 <br />