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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 /> fit,,,,,, <br /> Replace compressors and motors $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 existing Rink 1 system to an indirect industrial <br /> grade system <br /> Only recently has this option proven feasible for converting i <br /> Holmsten refrigeration packages from direct to indirect systems <br /> i <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 Photo P-1: The 2010 conversion of <br /> pressure receiver, pumper drums and piping, and main motor University of Minnesota-Duluth's ice <br /> on-campus ice rink system has proven <br /> control center. The existing system would be updated as very successful. See Option 3. <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 /> 961tevens 20 <br />