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ELK RIVER ICE ARENA—ICE SYSTEM EVALUATION AND RECOMMENDATIONS <br /> Option 4: —New indirect industrial grade system: Ills <br /> This option includes replacing the entire refrigeration system <br /> and concrete ice rink floor with an industrial grade flooded <br /> chiller, new blended HFC refrigerant, reciprocating <br /> compressors, pumps, and concrete rink floor. <br /> Option 5: Same as Option 4 but replace Freon with ammonia. <br /> This option is the same as Option 4 but replaces the use of a PhotoP-2: An example ofa"stick-built" <br /> new blended HFC type refrigerant with ammonia refrigerant. industrial grade,hydrocarbon, <br /> refrigeration system for a single ice <br /> This option also includes installing a new mechanical ventilation sheet,Andover,MN.See Option 5. <br /> system to meet the current ventilation code requirements for <br /> ammonia refrigerant and installing an exterior door for egress. <br /> or z ° <br /> rim <br /> Option 6. Carbon Dioxide (CO2) Refrigeration System ; <br /> Continuing the discussion from the refrigerant discussion earlier <br /> r <br /> in the report, the use of CO2 refrigerant will likely be the next <br /> substantial "innovation" in the ice rink industry. Currently <br /> European countries are using CO2 as a secondary refrigerant in <br /> ice rink applications. One rink in Canada just recently installed a �t r <br /> primary CO2 system. CO2 applications in the U.S are increasing Photo P-3: An example of a"skid package", <br /> especially in the supermarket industry. However the selection industrial grade,ammonia refrigeration <br /> of equipment is limited and the regulatory codes are still under system for a single ice sheet,Scottsdale,AZ. <br /> See Option 6. <br /> development. <br /> The cost information provide in the table at the end of this <br /> section is very preliminary. Because this is a new technology <br /> and application, there is fairly limited information on the <br /> systems. The cost estimates should be updated as the desired <br /> project date approaches. <br /> It is recommended that a CO2 refrigerant based ice system be <br /> seriously considered, as a replacement option for the current <br /> system, especially if the replacement of the West Arena's ice <br /> system will be more than two years from now. <br /> Option 7. Combined Refrigeration Systems using Ammonia <br /> This system option was included to provide an option for long <br /> term planning, including the replacement of the 15-year old <br /> refrigeration system in Rink 2. <br /> A common refrigeration system that serves both Rinks 1 and 2 <br /> offers advantages such as lower life cycle costs, higher <br /> efficiency, and lower operation and maintenance costs <br /> compared to two separate single ice systems. <br /> 961tevens 21 <br />