New Haven, CT

Yale University

Sloan Valve Low-Flow Plumbing Fixtures Combined with a Rainwater Harvesting System Helps Yale University's Kroon Hall Achieve LEED® Platinum Level
Designing Kroon Hall, home of the School of Forestry and Environmental Studies, gave Yale University administrators a challenge to design and build a "mega-green" building. Not only did they want to retain their eco-friendly mission, but they also sought to bridge the gap between nature and people in a 58,000-square-foot facility that would be built in the center of the city.

Because Kroon Hall was designed to use 81% less water than a comparable building, the combination of the UPPERCUT® dual-flush Flushometers with a rainwater harvesting system was the sustainable system selected to meet water efficiency goals. The system is expected to save the university more than 500,000 gallons of potable city water per year.

The rainwater harvesting system collects storm water from the roof and grounds and filters though a native aquatic plant garden located in the courtyard. Water from sinks and showers is also collected and added to the storm water. The graywater is then pumped back into a tank located in the basement, where the water is filtered and disinfected for use in flushing toilets. The UPPERCUT flushometers save one-half gallon of water when activating the reduced flush, maximizing their water efficiency.

Along with the rainwater harvesting system, the design team wanted to utilize solar power as much as possible. This was achieved by installing the 0.5 gallon-per-minute Sloan SOLIS® solar-powered, sensor-activated faucets. These faucets transform natural or artificial light into electrical power while delivering water efficiency.

To obtain all of their goals for green building, Yale University administrators hired a team of architects, planners, and a sustainability consultant to design the facility. The team evaluated more than 25 different sustainable measures to determine which were most cost- and energy- efficient.

Kroon Hall was awarded LEED Platinum by the U.S. Green Building Council (USGBC) in February 2010. According to the USGBC, the LEED system provides third-party verification that a building was designed and built using strategies that improve energy savings, water efficiency and greenhouse emissions, according to the U.S. Green Building Council. To achieve Platinum status, a building must meet standards for at least 52 points in categories such as water efficiency, indoor environmental quality, materials and resources and sustainable sites. Kroon Hall exceeded that number by seven points.

All five LEED points for water efficiency were obtained by incorporating many innovative water-saving and water-reusing features.
With combined efforts of the design team, a sustainability consultant and university administrators, Kroon Hall is the most sustainable building on campus.