Transcript Slide 1

Massachusetts High-Performance
Green Schools – Case Study
Whitman-Hanson Regional High School
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Library & Media Center.
This projects features
include utilizing daylight
extensively, energy
efficient lighting systems,
and high performance
windows.
Site Analysis
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Understand solar orientation
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Understand wind patterns
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Understand natural resources
(wetlands) and topography
Fact:
Smart site design can preserve natural areas, minimize stormwater
runoff, control erosion, reduce heat islands, and prevent light pollution.
Energy Efficient Building Design
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Three story design to minimize the building area
Natural lighting throughout
Courtyard design to allow natural light into core spaces
Increased Glazing Efficiency
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Baseline windows:
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U value = 0.57
Shading Coefficient = 0.88
Specified Windows:
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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
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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
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Installation of a cool
roof reduces heat
gain on the building
and reduces the heat
island effect.
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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
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Daylight harvesting
technologies
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Direct/Indirect pendant
fixtures
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High-bay fixtures with
compact fluorescents
allow instant on-off
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Reduced lighting power
densities
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All lighting fixtures
manufactured in MA or RI
Energy Efficient Systems: HVAC
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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
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Fully reactive controls:
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Automated with occupancy controlled VAV boxes
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Demand controlled ventilation in large spaces
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Variable Frequency Drives (VFD) control fan and pump motors
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Hybrid chilled water system
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Multiple condensing DHW heaters
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Centrally located mechanical room
Variable primary pumping (no secondary pumps)
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Whitman-Hanson Regional High School
Renewable Energy Systems
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51 kW PV system
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Evergreen Solar panels
manufactured in MA
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Oriented due south at a
29° angle
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Rack system did not
require roof penetrations
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Production last year
equaled 59,219 KWh
Whitman-Hanson Regional High School Case
Study Summary:
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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