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ELK RIVER ICE ARENA - ICE SYSTEM EVALUATION AND RECOMMENDATIONS <br />• System Design: The design of the system is critical to <br />maximizing its efficiency. For example, lowering the <br />condensing temperature of the refrigeration system <br />increases its efficiency but decreases the amount of waste <br />heat that is generated. Finding the balance between these <br />system elements is key to a successful and efficient design. <br />• Energy Source: As energy costs rise, alternative sources of <br />energy, such as geothermal, natural gas, or co- generation, <br />may look more attractive. Electricity still remains the most <br />practical energy source for these types of systems. <br />• Waste Heat Recovery: Refrigeration systems generate a <br />large amount of heat that is typically wasted into the <br />atmosphere. A refrigeration system for a single ice sheet <br />can typically generate enough waste heat to serve the <br />subfloor heating system, snowmelt pit, the dehumidification <br />system, and potentially preheat domestic water source or <br />in- coming air. Historically, ice rink facilities have only <br />captured and reused approximately 25% of the waste heat <br />generated. It has now become normal design practice to <br />capture 100% of the waste heat and reuse this "free <br />energy" throughout the facility. <br />• Sustainability: Sustainability goes hand -in -hand with all the <br />items in this list of considerations. Energy savings, through <br />smart design practices, translates directly into the reduction <br />of green house gas emissions such as carbon dioxide. <br />UStevens 16 <br />r'V1 NWF $ 'I '11417.i <br />