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<br />Roseville Skating Center and City Hall
<br />Feasibility Study September 23, 2007
<br />approximately balanced by the energy dissipated to the air through the Ice Arena and
<br />Speed Skating Oval cooling towers. Figure 20 shows the approximate energy balance.
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<br />Annual Energy Balance
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<br />ihermat Energy Dissipated by ice Arena Cooling'iovuer Thermal �nergy Required for Space � Water Heating
<br />Figure 20: If 4�� the buildings on the City Hall Campus are connected to an integrated mechanica
<br />system fhe overall energy balance is within 12% to 14%.
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<br />An integrated system recovers and reuses energy that is normally dissipated to the
<br />outside air. On the City Hall Campus there is an opportunity to recover energy from the
<br />refrigeration systems o� the Ice Arena and the Speed Skating Oval. This is possible
<br />because there are large heating requirements in several of the buildings at the same
<br />time the refrigeration systems are being heavily used. The refrigeration plant in the ice
<br />arena operates year round, and there are heating loads in all of the campus buildings for
<br />at least 6 to 8 months of the year, while the large refrigeration plant connected to the
<br />Speed Skating Oval operates only during the coldest months when the demand for
<br />heating is the greatest.
<br />By connecting the refrigeration systems to a GHX it is possible to accommodate
<br />temporary energy imbalances by storing thermal energy in the ground by simply allowing
<br />it to become slightly warmer or cooler. The large mass of the earth can store large
<br />amounts of thermal energy.
<br />In the last two years the five facilities on the City Hall Campus have used an average of
<br />3,295,900 kWh of electricity and 108,900 CCF (3,191,300 ��Wh) per year. The following
<br />table shows the current energy consumption and cost for each of the buildings.
<br />C�as Ek1�h ���S# ��i�1Mk� ElOCl�1c ic4'A�'I I C��t � k�1Jh
<br />CC� Ar�r1a i$anquet H�Ik ��1,2€� $a.�3� 1��0.�� �4.Q°rt
<br />�i#�]-I�tl f P�rb�l� 5af�l� 1��351�1 �a_�3� 1�99.�4� �a_GBF
<br />h��ir���r��nc� Garag� F90,92� $a.C�O .�13,��5 I �i4 Q7�
<br />�Fi[� H�I! 1768�� $0 �39 71.��5 �0.�3,�
<br />S �e� �k���n9 ��+al �13 75� �a.�4� �v�0,?�9 $0 ��8
<br />7�[�I � Aw�e� � 3,�E7,�3� $�_�38 3,�3d,78y i '�0_��3
<br />Geo-�ergy Systems Page 19 of 33
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