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1 <br />_ �. <br />_� <br />.� <br />� <br />� <br />9 <br />� <br />7� <br />11 <br />1� <br />1� <br />1� <br />15 <br />1� <br />�i <br />78 <br />1 <� <br />2� <br />21 <br />�� <br />23 <br />�d <br />2� <br />�4 <br />2� <br />�� <br />2� <br />� <br />�1 <br />� <br />�� <br />?�t <br />35 <br />� <br />�7 <br />�� <br />39 <br />�� <br />�1 <br />�� <br />�3 <br />�� <br />4k <br />�� <br />�� <br />�� <br />�� <br />5v <br />Roseville Skating Center and City Hall <br />Feasibilitv Studv <br />�. I�`T��D��T��E� <br />�.7_ �a�k�r+a�n�l <br />Seqtember 23. 2007 <br />The City of Roseville operates a skating center that includes an outdoor speed skating <br />oval and an indoor ice arena 1 banquet facility. Located adjacent to the skating center is <br />the Roseville City Hall and Public Safety Building, the Public Works Building and Fire <br />Hall, creating what is referred to as the "City Hall Campus". <br />The refrigeration system for the indoor ice arena is designed with a"direct-expansion" <br />R22 refrigeration plant. Liquid R22 refrigerant is pumped directly through copper piping <br />in the ice floor by the refrigeration compressors, where thermal energy in the ice <br />evaporafes the refrigerant. The system contains approximately 6,000 to 8,000 pounds of <br />r�frigerant. R22 refi��r�t is classified as an HCFC r�frigerant and is being phased out <br />of production because of the potential for damage to the ozone layer in the atmosphere <br />in the event of a leak. <br />The ice arena has been in operation since 1969. Because of the age of the refrigeration <br />equipment and the phase-out of the type of refrigerant used in the system, the City of <br />Roseville is replacing the refrigeration system in 2008. Two options are being considered <br />for the replacement of the refrigeration system. One option is to replace the direct <br />expansion refrigeration system with a conventional refrigeration plant that circulates a <br />secondary coolant through a new piping system that will be installed in the rink floor. The <br />second option is the installation of a refrigeration system integrated with the heating, <br />ventilation and air conditioning (HVAC) system and a ground heat exchanger (GHX) <br />The electrical consumption of the ice arena and the speed skating oval totaled <br />approximately 1,805,000 k�`4�7 over the last two years at an average cost of $131,800 <br />per year. Most of the electricity is used to refrigerate the ice surfaces for these facilities. <br />Natural gas is burned to provide space heating and domestic hot water in the Ice Arena 1 <br />Banquet Hall facility, and to provide hot waier to flood the ice surface on the oval. An <br />average of 36,600 CCF of natural gas was consumed over the last 2 years at an <br />average annual cost of $40,700. <br />In addition to the ice arena and the speed skating oval, the other buildings on the City <br />Hall Campus also consume significant amounts of energy. The City Hall 1 Police Station, <br />the Maintenance Garage and the Fire Hall use an average of 1,490,000 k�J'•� annually at <br />an average annual cost of $99,200. Natural gas consumption in these three buildings <br />averages 72,300 CCF annually, at a cost of $75,400 per year. <br />4.2. P��po�e and ���p� <br />The City of Roseville has retained the services of Geo-Xergy Systems Inc. (Geo-Xergy) <br />first to investigate the feasibility of integrating the heating, ventilation, air conditioning <br />(HVAC) system in the lee Arena 1 Banquet Hall with the proposed new refrigeration <br />system when it is replaced. <br />Secondly, Geo-Xergy has been asked to investigate the feasibility of integrating the <br />refrigeration system with the mechanical systems of several other buildings on the City <br />G��s-�Cergy Systems Page 1 of 33 <br />