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ELK RIVER ICE ARENA — ICE SYSTEM EVALUATION AND RECOMMENDATIONS <br />Other recommended improvements to the existing refrigeration <br />system include: <br />• Replace compressors: Parts for the existing York <br />compressor can be difficult to find since they are no <br />longer in production. These compressors can be rebuilt <br />and reused for well over 30 years. However, the <br />existing 42 -year old compressors are reportedly <br />showing wear on the main casting which would require <br />replacement in the near future. The compressors <br />should be replaced by compressors that can be used in <br />a future refrigeration system. <br />Table 3. Option 2 — Other Improvements to Existing System <br />Item <br />I cost''' <br />Replace compressors and motors <br />1 $75,000 <br />1. See explanation in Section 2 of this report. <br />2. Costs also include contingency, engineering, legal, and administrative. <br />Option 3: Convert existine Rink 1 system to an indirect industrial <br />grades stem <br />Only recently has this option proven feasible for converting <br />Holmsten refrigeration packages from direct to indirect systems <br />while using the existing refrigeration equipment. <br />The option includes converting the existing refrigeration system <br />to an indirect system by installing a new heat exchanger and <br />rink pumps. This option includes reusing the existing low <br />pressure receiver, pumper drums and piping, and main motor <br />control center. The existing system would be updated as <br />recommended in Option 1. The existing ice rink floor would <br />require replacement under this option. The existing ice <br />equipment room would likely require expansion for the <br />additional equipment <br />This option will reduce the charge of R -22 in the system from <br />approximately 4,000 pounds to 1,000 pounds. The City could <br />store the extra R -22 refrigerant for future use. A reduction from <br />4,000 pounds of R -22 to 1,000 pounds of R -22 will noticeably <br />reduce the facility's carbon footprint. <br />Photo P -1: The 2010 conversion of <br />University of Minnesota - Duluth's ice <br />on- campus ice rink system has proven <br />very successful. See Option 3. <br />G Stevens 20 <br />