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ELK RIVER ICE ARENA—ICE SYSTEM EVALUATION AND RECOMMENDATIONS <br /> ICE SYSTEMS <br /> General <br /> The facility is served by two separate ice systems (including <br /> refrigeration system and ice rink floor), one for each rink. The <br /> ice systems for both Rink 1 and Rink 2 are direct refrigeration <br /> type systems and were installed with the construction of the <br /> buildings they serve, 1981 and 1997 respectively. This report <br /> will discuss another common type refrigeration system used in <br /> the ice industry; indirect type systems. The options for <br /> replacing the direct ice systems, including replacing them with <br /> indirect systems, are discussed in this section. <br /> Definitions for each type of system are provided below: <br /> Indirect System: In an indirect system the primary <br /> refrigerant (R-22 for example) remains in the refrigeration <br /> room. Heat is removed from the ice rink floor through a <br /> secondary refrigerant (glycol/water solution for example) <br /> that is circulated in the floor. The heat exchange between <br /> the primary and secondary refrigerants takes place in the <br /> refrigeration room. <br /> Direct System: A direct refrigeration system circulates the <br /> primary refrigerant (R-22 in this case) directly through the <br /> ice rink floor and refrigeration system. There is no <br /> secondary refrigerant and therefore, no secondary heat <br /> exchange process. <br /> Overall, both systems have been very well maintained by the <br /> facility's operational and maintenance personnel. <br /> eStevens 9 <br /> ENGINEERS PLANNERS SURVEYORS <br /> • <br />