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Rnsevi9le Skating Center and City Hall Feasibility Study September 23, 2007 installed in the fall of 1998. The units are rated at 80% heating efficiency. Natural gas is used to provide service hot water for resurFacing the ice and showers in the locker rooms, and is required year round. 3.2. Speed Skating Oval Ice on the speed skating oval is maintained from November through February. Energy consumption is directly related to the months the ice surface is in use and the outdoor air temperature. The following chart shows the average heating degree days in the months of November to February, 2406. it�+.�.•? �SE.74C � 7�.� � � �� � �OOIl4d � � ��,o- _} �.. ._�� Heating Degree Days l GVL4i Consumption Correlation (2006) Nov Dec Jan Feb C7 k'��'fi Useage —Heating Degree Days 4 �Y, 1.300 1.200 � A 1,200 � � m 1.000 �, 906 �u° x aoa �� Figure 6: This chart illustrates the effect of weather on the kWl� consumption for the refrigeration system. In warmer months such as November, when there are fewer heating degree days, the k1�4'Fr consumption is higher, and in December and February when the degree days are higher, the kN+� consumption is lower. The following graphs show the energy consumption and energy cost for the Speed Skating Oval over the year. During colder weather the refrigeration plant does not operate as much since there is not as much load on the ice, while during a warmer month the plant operation increases. The electrical demands are very high when the refrigeration plant is in operation, while very little energy is used during the summer months. Natural gas consumption is high when the oval is in operation because of the use of hot water to resurface the ice and heating the maintenance garage attached to the refrigeration room. Geo-Xergy Systems Page 8 of 33