7.4. ICESR 04-08-2014 - Laserfiche WebLink

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ELK RIVER ICE ARENA—ICE SYSTEM EVALUATION AND RECOMMENDATIONS Observations of Existing Conditions We toured the ice systems for both Rink 1 and Rink 2 with the facility's management and operating and maintenance staff and have the following observations and comments. Rink 1 (The Barn): • The operational season typically runs from the middle of September through middle of April. • Rink 1 is served by a direct refrigeration system manufactured by Holmsten Ice Rinks. The major of the components include two (2) 4 cylinder York compressors, one (1) low pressure receiver, two (2) pumper drum vessels and one (1) motor control center. The 31-year old refrigeration system has exceeded its expected life of 25-30 years. However, since this system only operates 6 months per year, the life span of the equipment is likely to be greater than 30 years. The system is in fair condition for its age, but, it's becoming more difficult to maintain with its outdated electrical and control systems, discontinued compressors units, etc. Some improvements have been performed on the refrigeration package over the years and include rebuilding compressors, new valves and insulation, new fill solenoids, float switches, top ends on compressors, dryer cores, replaced relief valves, and new ASME certified oil separator. • The existing evaporative condensing tower, was replaced in 2010 and is manufactured by Baltimore Aircoil (BAC). This system uses air and water to dissipate heat for the refrigeration processes. • There are no waste heat recovery systems on this refrigeration system. The existing snowmelt pit that is dedicated to Rink 1 is only used as a back-up and uses a boiler system to heat the water and melt the ice shavings. The primary pit is a common pit with Rink 2. There is no subfloor heating system beneath the rink floor. All waste heat is dissipated to the atmosphere, through the condensing tower. PIStevens 10