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"� 5- Geo-Thermal Refrigeration <br />� Advantages <br />_; • Green technology <br />�. o Projected annual energy savings of $23K <br />� Uses waste heat to heat banquet facility and other areas of Skating <br />� Center <br />7 • Possibly part of longerterm master plan for campus <br />� Disadvantages <br />1� . Uncertainty of ice quality (risk) <br />i i . Uncertainty of ambient temperature control <br />�� * Uncertaintyof being able to maintain ice on hot days in summer <br />1:� . Potential long term heat saturation of ground, reducing geothermal <br />] �i effectiveness <br />� 5 . Higher �pfrant cost - long payback <br />1� <br />i:� If the City decides to proceeds with Geothermal, the next steps would be to <br />1� perform conductivity tests (bore holes) at an estimated $10,000 -$14,000 per <br />1� hole and to establish a design team (hire an engineering firm). If the decision is <br />��,; to move forward with the geothermal, it is anticipated that the test hole can be <br />��i reused as a part of the ground heat exchanger. <br />�� <br />2=� If the City proceeds with the conventional system replacement, Stevens <br />�� Engineering has agreed to honor the terms of their proposal from 2006 to provide <br />2 L engineering services for the component replacements. This service will establish <br />��7 a recommendation on either the direct or indirect system. Attached is a copy of <br />�'; that agreement. <br />� �. <br />��� The current piping that is in the arena floor is steel. Steel has been a commodity <br />�� � that has been very difficult and expensive to obtain over the past several years. <br />�]. We expect that this difficulty may continue. The conventional component <br />�� replacement will more than likely have some challenges along the way. If steel <br />�� cannot be obtained then the indirect system replacement will need to be pursued <br />�� as it uses plastic piping. <br />�':: <br />�{} Due to the magnitude of the project; the potential disruption of schedules; the <br />�'� need to communicate to users on the earliest possible date and assist them in <br />�_� locating alternative ice, it is important that the City begin as soon as possible on <br />��- the planning, engineering, and bidding phases. This approach will also help us <br />��: get the most competitive bidding prices. <br />�; <br />��} Based upon the initial inspections it is anticipated that the chiller barrel will only <br />�� need to be re-insulated at this time, but a further evaluation will need to be <br />�� conducted upon approval of the project. <br />