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Elk River Ice Arena <br />HVAC Study <br />R12-1311.000 <br />The ice arena complex consists of two (2) buildings that are connected with a sheet of ice in each <br />building. The Barn was built in 1971 and the Olympic size rink building was built in 1997. Both rinks <br />are open 7 days a week for about 14 to 18 hours a day between September and March. During the <br />summer the Barn Rink is shut down while the other sheet of ice is operating during the week for about 12 <br />hours a day. Both sheets of ice are maintained between 19° F and 20° F and get turned down to 17 '/z° F <br />for events and are resurfaced by electric Zambonis and edgers that have rechargeable wet cell batteries. <br />Both buildings have a dry fire protection system. <br />Barn Mechanical Systems <br />This building currently does not have any ventilation air (outdoor air) with the exception of building <br />infiltration or if the building wall exhaust is activated. The rink has a Dectron dehumidification unit <br />hung from the structure and the bleachers have one (1) strip of gas fired radiant heat controlled by a dollar <br />validator machine that the spectators can turn on by inserting dollars. The locker room areas are served <br />by a gas fired condensing furnace that does not receive outside air. The Zamboni room is heated by gas <br />fired unit heaters and is not ventilated. The ice plant has an electric heater in it and does not have a code <br />required Feron evacuation system. <br />Olympic Size Rink <br />The rink is ventilated and dehumidified by a Munters Dry Cool AM30GG unit that was installed in 1999. <br />This unit has a desiccant wheel that removes humidity from the rink air and is reactivated by a modulating <br />gas burner. It also has an energy recovery enthalpy wheel. The spectator stands have gas fired radiant <br />heaters that are controlled by a dollar validator machine that the spectators can turn on by inserting <br />dollars. The lobby, concession, snack, office and toilet room areas are served by a gas fired rooftop unit <br />with DX mechanical cooling. This unit brings in ventilation/make-up air for the toilet exhaust and <br />occupants. The locker room area has in floor radiant heat served by high efficiency boilers that were <br />installed in 2009. Ventilation for these spaces is supplied by a gas fire 100% make-up air unit that <br />supplies air to the space and is relieved out of gooseneck ducts on the roof. The ice plant room has a gas <br />fired unit heater and a Feron evacuation system consisting of outdoor air intake exhaust fan and Feron <br />sensor controller by an outdoor air intake and exhaust fan. The rink Managers office on the upper level is <br />heated, ventilated and cooled by a fan coil unit that supplies air from the rink to the office and air is <br />reheated as required by an electric duct coil. <br />Barn Mechanical Deficiencies and Recommendations <br />Note: The following recommendations are assuming that the building envelope issues will be <br />addressed. <br />1. The rink and spectator area does not meet current indoor air quality code because no outdoor air <br />is being supplied to the space. The Dectron dehumidification unit is under sized for the space and <br />year round operation. As it gets warmer outside the humidity levels raise and the space becomes <br />foggy. The higher humidity levels have also caused damage to the building envelope. <br />Recommendation: Provide a dehumidification unit similar to the Munters unit sized for the <br />smaller rink. This will provide dehumidification and outdoor air that is required by code. <br />Page 1 <br />Mechanical/Electrical Consulting Engineers <br />1750 Commerce Cour• White Bear Lake, MN 55110 • Phone (651) 748-1100• Fax (651) 748-9370 <br />is\projects\elk river, city of\r12-1311.000\correspondence\outgoing\elk river ice arena.docx <br />