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— ..� <br />� <br />.� <br />� <br />— :� <br />— � <br />_ f <br />� <br />� <br />i� <br />-'I� <br />— 1� <br />— '� � <br />— '� � <br />7� <br />�� <br />f� <br />�� <br />� �, <br />�� <br />�7 <br />2� <br />_ �3 <br />— �� <br />2� <br />Roseville Skating Center and City Hall <br />Feasibility Study September 23, 2007 <br />installed in the fall of 1998. The units are rated at 80°/o heating efficiency. Natural gas is <br />used to provide service hot water for resurFacing the ice and showers in the locker <br />rooms, and is required year round. <br />3a�d Speed �l�a#�r+� �v�l <br />Ice on the speed skating oval is maintained from November through February. Energy <br />consumption is directly related to the months the ice surface is in use and the outdoor air <br />temperature. The followingychart shows the average heating degree days in the months <br />�f ���rtn' I��r Fo i- f=� ��I �i �'� Ll���`} <br />� :;�� <br />� <br />; .r�a� <br />a <br />,.', x.c,.�o- <br />� <br />'s • 1� <br />..�: �, <br />'ex:c:: <br />�4eaYPn� f�egre� Days (k�@� Cnr��usnp�ioa� C�r�ctaEiaer(?.t7QBj <br />—1- <br />�i� <br />�•� I '. I �—•--- <br />— — -- — ' '� <br />• ;pp <br />, ..� � <br />. � <br />� <br />_ �,� � <br />� <br />. _ _ . �� <br />.,� w <br />� <br />.'i• r�' ;r�f a <br />• 2 <br />..__ . .��G <br />. � <br />--..._. . � <br />. tiy: <br />Nov Dec Jan Feb <br />c� �k�� Useag� —1-�eating Degree Days <br />Figure 6: This chart illustrates �he effect of weather on the M��� consumption for the refrigeration <br />system. Irt warmer months such as November, when there are fewer heating degree days, the <br />kWh consumption is higher, and in December and February when the degree days are higher, <br />the kWh consumption is lower. <br />The following graphs show the energy consumption and energy cost for the Speed <br />Skating Oval over the year. During colder weather the refrigeration plant does not <br />operate as much since there is not as much load on the ice, while during a warmer <br />month the plant operation increases. The electrical demands are very high when the <br />refrigeration plant is in operation, while very ���t�e energy is used during the summer <br />months. Natural gas consumption is high when the oval is in operation because of the <br />use of hot water to resurface the ice and heating the maintenance garage attached to <br />the refrigeration room. <br />Ge�a-�ere�� Systems Page 8 of 33 <br />