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Roseville Skating Center and City Hall Feasibility Study September23, 2007 continuously. The electrical energy used to extract the energy from the ice surface is added to the thermal energy taken from the ice. An estimated 1,580,000 to 1,896,000 k��h+ of thermal energy is rejected to the air. An estimated 632,000 kV�F� of electrical energy is used to power the refrigeration compressors, pumps and fans to transfer this thermal energy from the ice to the air. The amount of energy dissipated by the cooling tower in the ice Arena is significantly greater than the amount of energy needed to provide space heating and service hot water in the facility. Through out most of the year an excess of energy is available. In order to take greater advantage of the excess of thermal energy, two options are available: � One option is to use the excess thermal energy to provide space or water heating in the other nearby buildings, or use the energy for some other purpose. In some facilities it has proven advantageous to use the excess thermal energy to melt snow on the sidewalks, loading docks or for other uses. • A second option is to provide a method of storing the thermal energy when there is excess in a manner that provides the capability to withdraw the energy when it is required. Because the other buildings on the City Hall Campus are very near the lce Arena and require large amounts of thermal energy to provide space heating, and the buildings are all operated by a single owner (the City of Roseville) it should be relatively simple to interconnect or integrate the mechanical systems with that of the �ce Arena. 5.3. lntegrating Other City Hall Campus Buildings Because of the proximity of all of various campus buildings, there are opportunities to transfer energy from one building to another. For example, the City Hall t Public Safety Building currently consumes more energy than the other campus buildings. This building also has the largest cooling load of any of the buildings (other than the refrigeration load for making ice). Figure 18 shows the total energy balance of the Ice Arena 1 Banquet Hall and the City Hall 1 Public Safety Building. A system with both buildings are integrated into a common energy transfer system becomes more evenly balanced, especially when one of the buildings is cooling dominant and the other is heating dominant. Thermal energy that is normally "wasted" through the cooling tower can now be transferred to the other building. Geo-Xergy Systems Page 17 of 33