Engineered Systems - March 2009 - (Page 53)

spaces such as gymnasiums, cafeterias, auditoriums, and libraries, but has also implemented it successfully in classrooms. Energy recovery. The current NHSCP high-performance standards encourage the use of heat recovery/energy recovery in the air-handling systems, and this feature has been incorporated at nearly all New Haven schools. This concept avoids the waste of the tempered exhaust air that is discharged from the building. In order to conserve this energy, AHUs are equipped with heat exchangers (heat recovery wheels), which utilize the exhaust airstream to heat the incoming outside air in the winter (and the reverse in the summer). This allows smaller heating and cooling equipment to be used throughout the facility. ing the peak demand cost. The application at Bishop Woods is expected to decrease peak demand during the summer months by 23%. This approach also has another advantage. Since the chillers are intended to run 24 hrs a day, the capacity of the chillers can be reduced by approximately 50% compared to a conventional design. This also reduces the initial capital expenditure. BUILDING COMMISSIONING Many of the sustainable/high performance concepts currently being enacted by NHSCP do add a level of complexity not seen in a more traditional facility. These systems and concepts (such as daylight harvesting and the energy management strategies) are justified if operating as designed because of the life-cycle monetary savings and resource Approximately $6 billion is expended p d annually on energy to operate our schools, an expense second only to staff and faculty salaries. Studies have shown that facilities built around sustainable criteria utilize 30% percent less energy, use 30% to 50% less water, and produce 40% less CO2. Dual-fuel boilers. Boiler design incorporates dual-fuel systems capable of operating on either gas or oil. The capability to switch between oil (stored onsite in an above-ground tank) and interruptible gas allows the city the option to mitigate gas demand charges during an extended peak heating period. Thermal storage. The recently designed Bishop Woods School in New Haven utilizes a partial thermal energy storage system. The justification for this approach stems from the increased electrical demand charges that are levied by the electrical utility during peak demand times. By making ice at night when electrical cost is at its lowest, the building is cooled at peak demand times without pay- Solutions Balancing energy savings and ventilation requirements is a serious challenge in K-12 schools. International Codes, ASHRAE Standard 62.1 and the Green Building Council all deﬁne and require proper ventilation in buildings. According to the EPA website, indoor air quality is among their top four concerns. But, still half of all schools have reported poor IAQ 1. How do you know you are getting the correct ventilation to school children? The answer is Ruskin’s Air Measuring Dampers and Louvers. Ruskin products accurately monitor and control ventilation air 100% of the time, ensuring proper ventilation while saving energy dollars. Ruskin’s Air Measuring Dampers and Louvers… Never too much air…Never too little…ALWAYS JUST RIGHT! To learn more about Ruskin’s air measuring solutions, or to locate a representative nearest you, visit our website at www.ruskin.com or call us at (816) 761-7476. 1 From Building Air Quality A Guide for Building Owners and Facility Managers – EPA Publication No. 400/1-91/003 3900 Dr. Greaves Rd., Kansas City, MO 64030 (816) 761-7476 Fax (816) 765-8955 www.ruskin.com Email: ruskin@ruskin.com Input 60 at www.esmagazine.com/instantproductinfo w w w. esmag a zin e. c o m 53 http://www.ruskin.com http://www.ruskin.com http://www.ruskin.com http://www.esmagazine.com/instantproductinfo http://www.esmagazine.com

Table of Contents Feed for the Digital Edition of Engineered Systems - March 2009

Engineered Systems - March 2009 Contents Editor’s Note Back2Basics Case In Point Commissioning Building Automation HVACR Designer Tips Application Checklist Teaching An Old School New Tricks Basics For Absorption Chillers A New Haven For Sustainable Schools Glossary Classifieds Advertiser Index Tomorrow’s Environment

Engineered Systems - March 2009

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