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176 The main utilization issues for this application would be the availability of a large unshaded , south facing wall , and ducting integration between the collector and an outdoor air intake for the natatorium . 3 . Photovoltaics ( PV' s ) PV panels convert sunlight directly into low voltage DC electrical power . The use of photovoltaics . in this facility applies mostly to areas outside the natatorium . Applications include sign* and outside Lighting and small lighting or equipment loads within the building . Due to the high cost of PV panels , batteries , transformers and controls , the payback for these types of building PV systems generally will significantly exceed 20 years without demonstration grant funding . 4. Waste heat recovery It is very likely that the majority of new commercial pools use one of two forms of waste heat recovery. Waste heat recovery involves capturing heat from warm air or liquids that would normally be rejected from the building . ' Very few new and renovated natatoriums use conventional heating and cooling systems . This is because conventional systems are high energy users that do a poor job of dehumidification . Instead in these facilities , designers increasingly specify packaged dehumidification systems that several ' companies manufacture ( PoolPak and Dectron ) . These systems are energy efficient because they use captured waste heat from the dehumidification process to heat pool water or air . These systems also . utilize computerized controllers and sensors to optimize the space conditioning conditions using the minimum amount of energy. A second method of waste heat recovery associated with indoor pools tends * to be used in more northern climates . in this case waste heat is captured from the building exhaust air. A run around coil or similar heat transfer device is installed to preheat outdoor ventilation air with waste heat extracted from the warm building exhaust * air . 5 . Methane gas recovery from the dCounty landfill Currently, the County passively vents landfill gases into the atmosphere at the Eubanks Station landfill , it is technically possible to extract methane from these exhausted gases . if extracted methane was • piped to the site ; the new aquatic center could use -this wasted fuel to partially or completely heat the building and hot water. A large number of issues and costs would have to be addressed to evaluate this option further; includin �_ . . ,., ". , . 9 .: Costs..of building and operating the processing plant and pipeline . 4 IF Meet 4 0 Gas quality; years of • availability, price . 4 0 ' 0 0 9 . t %40 • Grants availability to study feasibility and to subsidize implementation costs . ve ENERGY EFFICIENCY FEATURES 1 . Thermal shell Additional 1nsulat16n , is needed in thetwalls and roof of the natatorium for .two reasons : • . .The building will be . heated to high space temperatures (82-88 degrees) during * the, winter .; • The extra insulation is needed to keep ' surface ande cavity temperatures . above* dewpolnt temperatures to "preve,h moisture condensation problems .