Massachusetts High-Performance Green Schools – Case Study Whitman-Hanson Regional High School Library & Media Center. This projects features include utilizing daylight extensively, energy efficient lighting systems, and high performance windows.

Fact: Smart site design can preserve natural areas, minimize stormwater runoff, control erosion, reduce heat islands, and prevent light pollution. Site Analysis Understand solar orientation Understand wind patterns Understand natural resources (wetlands) and topography

Energy Efficient Building Design Three story design to minimize the building area Natural lighting throughout Courtyard design to allow natural light into core spaces

Increased Glazing Efficiency Baseline windows:  U value = 0.57  Shading Coefficient = 0.88 Specified Windows:  U value = 0.31  Shading Coefficient = 0.46  Solar Screen, Low-E, Blue Green Fact: Windows specified provide electricity and natural gas savings by reducing cooling load due to solar radiation and heating energy loss due to heat conduction through the glass.

Increase Insulation R Values Wall Insulation:  Increased code minimum of R-7.5 continuous insulation to R-10 continuous Roof Insulation:  Increased code minimum R-17.7 continuous insulation to R-20 continuous Fact: Increased building insulation levels improve energy performance.

Cool Roof Technology Installation of a cool roof reduces heat gain on the building and reduces the heat island effect. Cool roof used is a white membrane installed on 95% of the roof surface. FACT: Buildings with light colored roofs can realize a reduction in cooling energy by as much as 40%.

Whitman-Hanson Regional High School Energy Efficient Systems: Lighting Daylight harvesting technologies Direct/Indirect pendant fixtures High-bay fixtures with compact fluorescents allow instant on-off Reduced lighting power densities All lighting fixtures manufactured in MA or RI

Energy Efficient Systems: HVAC High Efficiency condensing gas-fired boilers Modular design allows staging boilers to match heating load This 235,000 sq. ft. high school uses less gas than one of the districts existing 8 classroom elementary schools

Energy Efficient Systems: HVAC Fully reactive controls:  Automated with occupancy controlled VAV boxes  Demand controlled ventilation in large spaces  Variable Frequency Drives (VFD) control fan and pump motors Hybrid chilled water system Multiple condensing DHW heaters Centrally located mechanical room Variable primary pumping (no secondary pumps)

Whitman-Hanson Regional High School Renewable Energy Systems 51 kW PV system Evergreen Solar panels manufactured in MA Oriented due south at a 29° angle Rack system did not require roof penetrations Production last year equaled 59,219 KWh

Whitman-Hanson Regional High School Case Study Summary: 577,037 KWh electric savings per year relative to Code 11,719 Therms gas savings per year relative to Code $100,060 energy cost savings per year 972,360 gallons water savings per year relative to Code $1,109,800 total grants and rebates earned $826,853 DOEd / MSBA state incentives Net incremental cost to taxpayers = (-$70,404)

Energy Efficiency Programs in Massachusetts