2007_1015_Packet - Laserfiche WebLink

Home

Roseville Skating Center and City Hall Feasibility Study September23, 2007 Speed Skating Oval The only building connected with the speed skating oval is the refrigeration room and the garage / service shop adjacent to the refrigeration plant room. The building is approximately 2,860 square feet in area. The building is heated with gas unit heaters suspended from the ceiling. Hot water used to resurface the ice on the speed skating oval is heated with a natural gas water heater. 2.2. City Hall / Public Safety Building The City Hall and Public Safety Building was constructed in two phases. The original City Hall was built on two levels of approximately 13,440 square feet per level for a total of 26,880 square feet. Both floors are used primarily for office space and meeting rooms. The Public Safety Building was added to the existing building in 2003. The main level office space totals approximately 20,390 square feet. Approximately 3,490 square feet of the lower level is used for offices and meeting rooms and 16,900 square feet is used as a parking garage. City Hall The distribution system in the City Hall is designed as a forced air system, with one air handler for the main floor and one for the lower level. A direct expansion cooling coil is installed in each air handler. A variable air volume (VAV) distribution system is designed for each of the air handlers. The control system is designed to deliver air to the individual zones (offices, meeting rooms, etc.) at approximately 65°F. Hydronic heating coils located at the VAV boxes in the zones reheat the air if the temperature in the room drops below the thermostat heating set point. A natural gas boiler provides hot water to the air reheat coils located at the VAV boxes. This design creates a heating demand in some of the building zones during the cooling season. Public Safety Building The Public Safety Building was built in 2003 as an addition to the City Hall. The main level is used primarily as office space and meeting rooms. Approximately 1,300 square feet of the main floor allows vehicle access for shipping / receiving etc. Most of the lower level is used as conditioned vehicle parking space. The office area mechanical system is very similar to the system in the City Hall. A roof mounted cooling unit provides 60 tons of cooling capacity. The office area is zoned with VAV boxes. Air to the individual zones is reheated if necessary to meet the temperature set point for the zone. The lower level parking area requires significant amounts of ventilation. This is accomplished with an exhaust fan controlled by a carbon monoxide sensor. Geo-Xergy Systems Page 4 of 33