IPWG agenda 120700 - Laserfiche WebLink

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Daylighting system design is promoted but not required by Volume X . Designers that include a qualifying system can significantly increase window and skylight areas . Qualifying daylighting systems must be automatically controlled with photo cells , and they must be able to reduce fighting fixture electricity use by 50 % within a defined zone when daylight is available . Current design practice in natatoriums appears to prefer the use of manual light controls on indoor pools with daylighting sources . The preference for manual controls is likely due to the predominance of metal halide lighting use in these spaces . Metal halide lights have a long cool -down and warm - up time when they are turned off and on . If natural daylighting is included , at a minimum there should be a reduced manual light setting that will allow pool staff to reduc electric fighting use during the daytime . A qualifying automatic system will insure reduced lighting use , but will require careful design consideration to realize adequate lighting performance . 4. Energy efficient motors Indoor commercial swimming pools have two large motor loads : Pool water filtration and space ventilation . Volume X requires the use of energy efficient motors for these types of loads . As was stated above , a non -tradeoff compliance with the Town ordinance would require efficiencies 30 % higher than the Volume X values . Commercial pools have varying . levels of activity. The highest level takes place at pool meets when spectators fill the stands ; medium activity levels occur during other times when the pool is in use; and the lowest- level is nighttime and holidays when the pool is unoccupied ( particularly when a pool cover is in use ) . These varying levels of occupancy may provide significant opportunities to saving energy with variable levels of pump and fan motor ' use . Variable levels can be accomplished with multiple motors , multi-speed motors or variable speed motors , operated by manual or automatic controls . Note that none of the information obtained on the packaged dehumidification systems for natatoriums lists options for energy efficient or variable speed motors . 5 . Energy management controls In natatoriums , indoor and outdoor environmental conditions vary constantly . indoor conditions vary based on occupancy, activity level and , when unoccupied , whether a pool cover is used . The outdoor variable is the her, particularly concerning the air temperature and relative humidity . Automatic energy and environmental controls should strongly be considered for the new facility. These controls wilt allow the room humidity, temperature and ventilation conditions to be maintained using the minimum amount of energy: The. main features to consider include : • DehC� midiftcation reset to maintain space conditions and to minimize wall and roof condensation . • Economizer control too- maximize the use of dryer outdoor air *between the outdoor air temperatures of 60 •and 82 degrees :' • Waste heat recovery optimization between pool water heating and dehumidification reheat. • Unoccupied temperature , pump and fan energy control . • Pressurization control of ventilation and exhaust fans to maintain the building at a slightly negative pressure to outdoors on • a continuous basis : This prevents air moisture movement from the* space into wall and roof assemblies . 6. Energy utility metering ' A metering strategy should be developed that will allow the Town to purchase electricity and natural • (and/or landfill methane ) gas at the lowest possible rate . Generally. this means single, point metering for each utility to maximize volumes of fuel. units purchased through the metering point .