2018-11-1_PR Comm Packet - Laserfiche WebLink

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were taken throughout this period to provide a good basis of information to evaluate the overall facility condition. The most significant repairs needed for the rink include replacement of equipment that has reached the end of its useful life and removing standing drainage from the edge of the rink. Technologies that improve operating efficiencies and save energy are being considered wherever possible. The lack of defined and effective drainage systems due to frost heave of the perimeter surfaces is causing damage to the rink surface, particularly the expansion joints on the south end of the ribbon. The movement of the rink slab, due to thermal expansion and contraction, is causing stress and damage to the pavement and fencing abutting the rink edge. It has also been noted that the turf areas on each end of the bandy rink are settling and much of the surface drainage from these surfaces is now flowing directly to the rink edge and ultimately under the rink slab where it freezes and causes the rink to heave in these areas. The perimeter drainage issues have reached a point where they must be corrected to avoid serious damage to the rink slab and expansion joints. Condition Assessment and Recommended Improvements Refrigeration Plant The refrigeration plant is an 800-ton ammonia/brine, industrial grade, custom-designed refrigeration plant with primarily Vilter Refrigeration equipment that delivers chilled brine refrigerant to 6 zones of cooling. The zones include four equal-sized zones covering the bandy rink area with two additional zones created by the radius loops on both ends of the Oval. The components and condition of the refrigeration system are outlined as follows: Compressors The system is powered by three (3) industrial grade Vilter 1201 ammonia screw compressors that are original, 25 years old, and still functioning well. Two of the three original microprocessor controls are still functioning, with one replaced in 2015 with a new Vilter Vision 20/20 controller. The remaining two 25-year old microprocessor controls are no longer manufactured so service and function has been problematic. They should also be replaced with Vision 20/20 controllers. All three of the Vilter industrial grade screw compressors are working well and with continued maintenance potentially have another 10 years or more of useful life. An energy-saving idea for the compressors could include an enhanced overall refrigeration system control that allow the compressors to run with floating head control, i.e. adjusting the condensing temperature to a lower value during cooler weather months to reduce horsepower requirements of the compressor motors. This type of control can be provided by many control manufacturers and would function as an overall control for the system not just the compressor control. The Vision 20/20 would not be needed with this type of more comprehensive control system. Other benefits of an enhanced overall control system could include proactive control of the rink brine temperature by monitoring real time ambient air temperature or even forecast information and automatically controlling brine temperature to maintain the best ice at the 111111