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17s It is likely that .the lowest cost electricity available from Duke power will be from their OPT commercial rate schedule , which is a Time- Of- Use electric rate . The least expensive natural gas service would be a brokered gas contract . This type of service is available to larger volume natural gas users . It is not clear at this time whether the new aquatic center would require enough annual natural gas use to allow the Town to negotiate a brokered natural gas contract . 7 . Water heating The potential water heating loads are pool water heating , shower use , other domestic hot water use , And space heating for all areas . High efficiency, direct fired , gas water heaters are a popular energy efficiency choice for aquatic centers . This type of heater has steady state efficiencies as high as 97 % . 8 . Automatic shut off valves for showers Low flow shower heads will ' be required by Volume X . Shower energy and water use often runs very high in pool facility because showers are often left running after use . Motion sensing or timed switches can be used to minimize wasted energy and water use due to this behavior pattern . 9 . Pool water treatment When water evaporates from indoor pools , water treatment chemicals that are used to chlorinate the water enter the breathing air . To maintain acceptable indoor air quality for the staff and . pool users , large amounts of outdoor air are brought into the building to dilute these air borne chemicals . This often amounts to two-to-three air changes per hour of outdoor air exchange . Current water treatment technology should be reviewed to determine if code approved options are available to reduce pool chemical use or4 to use alternative systems. Treatment options should be considered that will result in maintained indoor air quality at reduced outdoor air ventilation rates . BUILDING COMMISSIONING Commissioning is a quality assurance process that oversees the conception , design and installation of building systems . Its purpose is to insure that the completed building meets the design intent and requirements of the owner. Successful commissioning includes the preparation of manuals and training of operational and maintenance personnel . The result should be fully operational systems that can be properly operated and maintained throughout the useful life of the building . This evaluation initiates a building energy commissioning process for the potential new aquatic facility. Commissioning efforts will need to be continued through the design , . bid processing , construction , start- up phases and in the firsf year of building operation . The most important commissioning goals for this project include . • Clearly. establishing the design intent " of the owner. One of the key ' issues will be ' balancing ' . manual versus automatic building components for pool covers ; energy ' management and daylighting controls . Manual systems cost less to install but require skilled operators . • Selecting the optimum package of energy and renewable features to invest in . An objective evaluation will be required to compare the performance , operating , maintenance and useful life factors of competing features . • Envelope construction of the natatorium : Regular site inspections Will be required to insure the thermal , moisture and air barriers are meticulously installed . • Equipment start up oversight : This will involve days of field work . making sure that individual and combined pool and space . conditioning • equipment and controls. work as designed and respond faithfully to automatic and manual control changes .