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FACILITY AND OPERATIONS DESCRIPTION <br /> General Description <br /> The City Hall, Council Chambers and Police Department in Orono, MN were built in 1992. The buildings <br /> are primarily heated and cooled by fifteen natural gas furnaces with DX cooling. The Council Chambers <br /> building has horizontal furnaces that hang from the ceiling trusses. The City Hall and Police Department <br /> each have a mechanical room in the attic space that has vertical furnaces for those buildings. Each <br /> furnace has a pad mounted A/C condenser located on grade behind the buildings. A heat recovery <br /> ventilator has been added to each of the mechanical rooms to reduce the load on the furnaces. The front <br /> of the building has large glass walls that have electric baseboard radiation to pick up the heat loss in the <br /> winter. The vestibules have electric resistance unit heaters in the ceiling and the Police Department sally <br /> port has two gas fired unit heaters. There is no cooling in the vestibules or sally port. <br /> The furnaces are controlled by programmable thermostats located in each zone. <br /> Energy Modeling Analysis <br /> The analysis was performed using the DOE-2 eQUEST simulation engine. DOE-2 is the most widely used <br /> and accepted building energy analysis program that can predict the energy use and cost for all types of <br /> buildings. DOE-2 uses a description of the building layout, constructions, operating schedules (lighting, <br /> HVAC, etc.), conditioning systems, historical weather data, and actual utility rates provided by the user to <br /> perform an hourly simulation of the building and to estimate facility energy use and cost. <br /> Bui/ding Loads <br /> Information on the building envelope construction, occupancy schedules, and lighting and equipment <br /> schedules was provided by the building owner. A site investigation was conducted by MEP to gather <br /> information about the existing systems and buildings, not provided by the owner. <br /> 1. Building Envelope Construction <br /> Building construction, including walls, windows, and roofing, was modeled in accordance with the best <br /> available information on the existing building. Walls were modeled with R-12 insulation. Building <br /> fenestration was modeled with double clear window types. The roof was modeled with an insulation <br /> value of R-38. <br /> 2. Occupancy Schedules <br /> Full occupancy was modeled from 9am to 5pm with reduced occupancy from 7am to 9am in the <br /> morning, over the noon lunch hour, and from 5pm to 6pm. The office section was modeled as <br /> unoccupied on weekends and holidays. The council chambers schedule includes weekly evening <br /> meetings and the police department is scheduled for limited 24 hour operation based on discussions with <br /> the owner. <br /> 005.10.01 Page 5 of 18 City of Orono <br /> May 28,2010 Geothermal HVAC Feasibility Study <br /> engineers � consultants � commissioning <br /> MEP Associates, LLC� 7607 Equitable Drive,Eden Prairie,MN 55344�phone:952.224.4488 fax:952.224.4489�www.mepassociates.com <br />