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Roseville Skating Center and City Hall <br />Feasibility Study September23, 2007 <br />The refrigeration system for the speed skating oval operates from Novemberto the end <br />of February each year and rejects heat to the outside air through a cooling tower. <br />Figures 2 and 3 show a comparison of energy consumption and energy cost in the <br />buildings in 2006. <br />� All Buildings Energy Consumption (2006) I <br />_ ��_ x� <br />� t.�c c✓� <br />_ <br />C <br />� 1 }i1� ""<1 <br />� <br />� <br />� <br />� 1 �.i XF} <br />3 <br />� <br />� � :�,7 <br />0 <br />ice Arena 0+21 Cily Hat� Ma'trtt. Garage Fireh��) <br />❑ ElectricitykWfi ❑ Natural Gas - Equivalent kVVh <br />r�yu�C c. �.u�nNan�u�� ui u�C wia� CnC�yy cu���u�nNiw�� ui u�C uvC iacwuC� u�� u�C �.ny nau <br />campus. Electricity use is shown in kilowatt hours (kWh} and natural gas consumption is shown in <br />equivalent kilowatt hours (EkWhj <br />.. .. .. . -- - - ' 1 <br />Annual Energy CostforAll Buildings (2006) <br />���S.�C • . ... .- ---• - - -•-- <br />�•�: :��. __ . .. . ---• •_ _ _ ••--• — •-- ' -- - .. <br />• <. <br />•-- - . : . ... _... . <br />>�,;� -- - ••- - --• � <br />���' �`' .. ,�,: ; �,�.:: .. . . . I <br />�.. W . �..�;• <br />�•_ •.-� <br />�•� .r�r <br />� <br />..¢. <br />�.• — <br />'— ��'.>:.��I ._._ <br />—. ,. > <br />.••�t•rr.• r • ::.. <br />{• . <br />.�.� . �..• f ,J�' • <br />�c8 Arena quai City Hall Mail�k. Garage <br />0 ElectricityCost p Natural Gas Cost <br />FireS�ap <br />Figure 3: Comparison of the total energy cost of the �ve facilities on the City ,�'�r�' campus. The <br />current cost of natural gas per unit of energy is lower than the cost of electricity per unit of energy. <br />3.1. Ice Arena and Banquet Hall <br />!ee is maintained in the arena almost twelve months per year and the refrigeration <br />system uses the most significant portion of the electrical consumption for this building. <br />The electrical consumption is relatively consistent from 80,000 to 115,000 k�+lh per <br />month. Since natural gas consumption is primarily based on space heating needs, the <br />Geo-Xergy Systems Page 6 of �3 <br />