6.3. SR 08-13-2012 - Laserfiche WebLink

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ELK RIVER ICE ARENA — ICE SYSTEM EVALUATION AND RECOMMENDATIONS Option 4: — New indirect industrial grade system: This option includes replacing the entire refrigeration system and concrete ice rink floor with an industrial grade flooded chiller, new blended HFC refrigerant, reciprocating compressors, pumps, and concrete rink floor. Option 5: Same as Option 4 but replace Freon with ammonia. This option is the same as Option 4 but replaces the use of a new blended HFC type refrigerant with ammonia refrigerant. This option also includes installing a new mechanical ventilation system to meet the current ventilation code requirements for ammonia refrigerant and installing an exterior door for egress. Option 6. Carbon Dioxide (CO2) Refrigeration System Continuing the discussion from the refrigerant discussion earlier in the report, the use of CO2 refrigerant will likely be the next substantial "innovation" in the ice rink industry. Currently European countries are using CO2 as a secondary refrigerant in ice rink applications. One rink in Canada just recently installed a primary CO2 system. CO2 applications in the U.S are increasing especially in the supermarket industry. However the selection of equipment is limited and the regulatory codes are still under development. The cost information provide in the table at the end of this section is very preliminary. Because this is a new technology and application, there is fairly limited information on the systems. The cost estimates should be updated as the desired project date approaches. It is recommended that a CO2 refrigerant based ice system be seriously considered, as a replacement option for the current system, especially if the replacement of the West Arena's ice system will be more than two years from now. Option 7. Combined Refrigeration Systems using Ammonia This system option was included to provide an option for long term planning, including the replacement of the 15 -year old refrigeration system in Rink 2. A common refrigeration system that serves both Rinks 1 and 2 offers advantages such as lower life cycle costs, higher efficiency, and lower operation and maintenance costs compared to two separate single ice systems. Photo P -2: An example of a "stick- built" industrial grade, hydrocarbon, refrigeration system for a single ice sheet, Andover, MN. See Option 5. Photo P -3: An example of a "skid package ", industrial grade, ammonia refrigeration system for a single ice sheet, Scottsdale, AZ. See Option 6. U Steve n S 21