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Roseville Skating Center and City Hall Feasibility Study September 23, 2007 2.3. Public Works Building The Public Works Building is comprised of two existing buildings that were connected with the addition of a new vehicle maintenance center that was constructed in 2003. The total area of the existing buildings and the new building is approximately 62, 600square feet. The four sections of the building include: • An existing maintenance garage at the north end of the building of (approximately 12,400square feet) + A new vehicle maintenance garage connected directly to the south side of the existing north garage (approximately 31, OOOsquare feet) � A new public works office and meeting room area connected to the south side of the new vehicle maintenance garage • An existing maintenance garage at the south-east end of the building (approximately 9, 920square feet) The new office area and meeting rooms are heated and air conditioned using five rnaf- mounted heat 1 cool units. Natural gas is burned to provide heat and electricity powers the compressors to provide cooling. A gas make up air unit preheats fresh air provided to this area. The maintenance garage areas are heated with gas-fired infra red heaters suspended from the ceiling. Fresh air is supplied to the maintenance garage areas with gas-fired make up air units. In the two older sections of the building the make up air units are located inside the building with roof top vents. In the new section of the maintenance garage three roof-mounted make up air units provide fresh air. 2.4. Fire Hall The fire hall includes several offices and meeting rooms in addition to a parking garage for three emergency vehicles. The garage area is heated with gas-fired infra red heaters suspended from the ceiling. Roof mounted gas ! electric provides heating and cooling for the rest of the building. 3. ENERGY CONSUMPTION OF EXISTING SYSTEMS The buildings on the Roseville City Hall Campus use natural gas and electricity to provide space conditioning and refrigeration. Each of the buildings is designed with an individual, free standing mechanical system. The buildings are designed for a wide variety of uses. The City Hall / Public Safety Building are mainly office space. The Maintenance Garage and Fire Hall #1 are primarily used for vehicle maintenance and storage. The Ice Arena 1 Banquet Hall is used for recreation and large events, and the building associated with the speed skating oval is primarily used for maintenance and to house the large refrigeration mechanical room. The variety of building uses on the campus provides an opportunity to take advantage of a diversity of building loads. The refrigeration system in the ice arena operates almost year round, and is constantly rejecting thermal energy to the outside air through an evaporative cooling tower. Geo-Xergy Systems Page 5 of 33