Engineered Systems - February 2008 - (Page 16) CaseInPoint While many types of conservation were employed on the Ethical Culture Fieldston School, one of the major contributions to saving energy was the HVAC equipment. Extensive heat recovery methods were employed in both the pool area and throughout the building. EloFlow All-Stainless-Steel Ball Valve With Equal Percentage Flow ® With a NEMA 4X rating (pending), Elodrive’s new High Performance control v a l v e s s u r v i v e t h e toughest jobs in HVAC. They are watertight and corrosion resistant for damp indoor and outdoor applications. And inside, they feature brushless DC motor technology for constant running time and long service life. construction representative. Architect Cooper Robertson & Partners, construction manager Tishman Construction, and many of the contractors were chosen for the project because of prior experience with green building. While there are many types of conservation in the project, one of the major contributions to energy saving and heat recovery is the HVAC equipment. Ambrosino, DePinto & Schmieder, Consulting Engineers (ADS), which specified the equipment, is an engineering firm specializing in green design and is a USGBC member with several LEED Accredited Professionals on staff. SACRIFICING SHORT TERM COST FOR LONG TERM SAVINGS One energy-recycling example comes from the swimming pool’s comprehensive HVAC system, a DRY-O-TRON® model RS-162 manufactured by Dectron Inc. The 22,000-cfm dehumidifier not only keeps the 7,200-sq-ft swimming and 115-spectator spaces in a constant 50% rh, but it also recovers energy to provide free pool water heating for the school. If 100% pool water heating can’t be accomplished on extremely cold winter days, the dehumidifier has an on-board 540,000-Btu high-efficiency Call for more information. backup boiler, according to Robert Senia, president of HVAC manufacturer’s representative SRS Enterprises. While some schools attempt to save construction costs with a basic makeup air and exhaust system, ECFS officials opted for a commercial dehumidification system designed expressly for indoor pools, involving higher upfront equipment costs but significantly lower long-term operating costs. “Once we explained the IAQ, energy saving, and short payback benefits of a stateof-the-art mechanical dehumidifier, other methods were never considered during the planning stages,” said Michael Ambrosino, principal, ADS. The dehumidifier also uses another energy recovery method, Smart Saver, which pre-heats the unit’s 6,000-cfm outside air minimum requirement with hot exhaust air. Smart Saver is estimated to save the school $5,600 annually, based on natural gas prices of $1/therm. A POOL-LENGTH PLENUM ADS’s attention to sustainability didn’t restrict the architect’s aesthetics, which includes a high 20-ft ceiling to give the pool a feeling of spaciousness. The airflow design within the space still provides indoor air comfort regardless of the high ceiling. Elodrive USA, Inc. 866-356-3748 www.elodriveusa.com FREE INFO: 86 16 En gi neer ed S y stem s February 2008 ESM02084Elodrive.indd 1 1/18/08 1:42:08 PM http://www.elodriveusa.com http://www.elodriveusa.com
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