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5. Replace the existing shell a�d ttr6e type system with a plate �rrrrr��ar��c� �i � ti'+��. This option <br />would replace re-tubing the existing chiller. A plate and frame type systcm with titanium <br />plates would improve the durability of the system Fror� a materials standpoint and would add <br />redundancy to the refrigeration since two chiller systems would he installed. However, it <br />comes with a cost. The plate and frame system is much more expensive and will likely not <br />improve 11:�� overall efficiency of the refrigeration system by a noticeable amount. This <br />option is not recommended due to the cost. <br />The total cost of this project is estimated to be: $600,900 <br />6. Paint the piping foat�d from 1�r�' evaporativecondenser. This should be an on-going <br />maintenance item. <br />The total cost of this project is estimated to be: <br />7. Consider the following additional alternate bids to �he base bid project. <br />$1,000 <br />A. Add start up services. Because an experienced ice rink contractor will already be on-site <br />it is recommended that the contractor also be responsible for performing the start up of <br />the system after the repairs are complete and to perform any routine maintenance on the <br />system {e.g. compressor oil change, etc.). _ <br />B. Infrared Sensor. Adding an infrared sensar to sense the surface temperature of the ice � <br />sheet may provide better control far the refrigeration system. It is recommended that this � <br />be evaluated during the design process. <br />