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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 />UStevens 9 <br />