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Roseville Skating Center and City Hall FeasibilityStudy September23, 2007 2.1. Ice Arena and Banquet Hall The Ice Arena The Ice Arena was constructed in 1969. The facility includes an NHL size ice surface (85' x 200') with 2,000 spectator seats and a walking track. There are seven locker rooms and a concession area. The ice surface is used year round except for a short maintenance shutdown for two to three weeks in August. The refrigeration system is a direct-expansion design using R-22 refrigerant. Liquid refrigerant is pumped directly through copper tubes buried in the sand floor of the ice surface. As it circulates through the copper tubing the refrigerant absorbs thermal energy from the ice surface as it evaporates. The refrigerant gas is drawn into the compressors and as it is compressed the temperature of the gas rises. The hot refrigerant gas is circulated through an evaporative cooling tower where it condenses to a liquid. I� is then forced through a thermal expansion device. As the pressure drops when it passes through the expansion device, the temperature of the liquid refrigerant drops and it is circulated through the floor tubing again. This system contains an estimated 8,000 pounds of R-22 refrigerant. Production of R-22, which is classified as a hydro-chlorofluorocafbon(HCFC), is being curtailed because of the harm it causes to the ozone layer when it is released to the atmosphere. Dehumidification in the arena is accomplished using a vapor compression cycle to chill an air coil to condense moisture from the air. Thermal energy taken from the air, plus the electrical energy needed to operate the compressor and fan, reheats the air after the moisture has been removed. Heating in the ice arena itself is provided by two gas-fired rooftop units with distribution dt�c�wnrk above the spectator seating on either side of the arena. The refrigeration system is scheduled for replacement in 2008. Banquet Hall, Offices and Locker Rooms Attached to the ice arena is a two level facility that includes seven locker rooms for the users of the ice arena, banquet rooms, office space for the facility operators and meeting rooms. The offices and banquet rooms are located on the upper level. The lower level includes the locker rooms, weight room facilities, and service and refrigeration rooms. The largest banquet room accommodates up to 600 people, while the two smaller meeting rooms each accommodate up to 30 people each. Each of the facilities on the upper level are heated and cooled with a roof-mounted heat / cool unit. Heating is supplied with natural gas and cooling is provided with an air cooled condensing unit. Service hot water for showers and resurfacing the ice is heated with natural gas water heaters. Geo-Xergy Systems Page 3 of 33