massachusetts high-performance green schools – case study whitman-hanson regional high school...
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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 SchoolRenewable 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)