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Roseville Skating �e€'�t�rF and City Hail <br />Feasibilitv Studv <br />� � _ ��-�r�t �tid $��� �EI <br />September 23, 2007 <br />2 � h� #� Arers�r <br />� The Ice Arena was constructed in 1969. The facility includes an NHL size ice surface <br />� (85' x 200') with 2,000 spectator seats and a walking track. There are seven locker <br />� rooms and a concession area. The ice surface is used year round except for a short <br />� maintenance shutdown for two to three weeks in August. <br />� <br />8 The refrigeration system is a direct-expansion design using R-22 refrigerant. Liquid <br />� refrigerant is pumped directly through copper tubes buried in the sand floor of the ice <br />7 � surface. As it circulates through the copper tubing the refrigerant absorbs thermal energy <br />�� from the ice surface as it evaporates. The refrigerant gas is drawn into the compressors <br />�� and as it is compressed the temperature of the gas rises. The hot refrigerant gas is <br />S3 circulated through an evaporative cooling tower where it condenses to a liquid. It is then <br />1� forced through a thermal expansion device. As the pressure drops when i�� passes <br />�� through the expansion device, tihe temperature of the liquid refrigerant drops and it is <br />46 circulated throughthe floortubing again. <br />�� <br />y$ <br />�9 <br />�� <br />�1 <br />�� <br />�3 <br />�� <br />�4 <br />�6 <br />�} <br />�8 <br />�� <br />�{5 <br />31 <br />32 <br />�� <br />3� <br />�r. <br />w <br />�� <br />�� <br />38 <br />3� <br />�C� <br />�' <br />�? <br />�4:3 <br />-0� <br />�� <br />This system contains an estimated 8,000 pounds of R-22 refrigerant. Production of R-22, <br />which is classified as a hydro-chlorofluorocarbon (HCFC), is being curtailed because of <br />the harm it causes to the ozone layer when it is released to the atmosphere. <br />Dehumidification in the arena is accomplished using a vapor compression cycle to chill <br />an air coil to condense moisture from the air. Thermal energy taken from the air, plus the <br />electrical energy needed to operate the compressor and fan, reheats the air after. the <br />moisture has been removed. <br />Heating in the ice arena itself is provided by two gas-fired rooftop units with distribution <br />ductwork above the spectator seating on either side of the arena. <br />The refrigeration system is scheduled for replacement in 2008. <br />Banquet Hall, Offices and Locker Rooms <br />Attached to the ice arena is a two level facility that includes seven locker rooms for the <br />users of the ice arena, banquet rooms, office space for the facility operators and meeting <br />rooms. The offices and banquet rooms are located on the upper level. The lower level <br />includes the locker rooms, weight room facilities, and service and refrigeration rooms. <br />The largest banquet room accommodates up to 600 people, while the two smaller <br />meeting rooms each accommodate up to 30 people each. <br />Each of the facilities on the upper level are heated and cooled with a roof-mounted heat 1 <br />cool unit. Heating is supplied with natural gas and cooling is provided with an air cooled <br />condensing unit. <br />Service hot water for showers and resurfacing the ice is heated with natural gas water <br />heaters. <br />Geo-Xergy Systems <br />Page 3 of 33 <br />