NORTHERN ENCLOSURE: CLIMATE DRIVEN STRATEGIES FOR HIGH-PERFORMING FAÇADES FAÇADES+ MINNEAPOLIS July 24, 2019
FIRM FACTS Single Office Since 1932 • 170+ Person Studio FUSION of Design + Performance • Science & Healthcare Building Science Group • Leading-edge in Sustainability
2019 AIA Architecture Firm of the Year
77% Reduction in energy use
Amherst College, New Science Center
2019 AIA COTE TOP TEN AWARD
The Science Center defines a community for the sciences a destination for the entire campus
Canopy unifies the Science Commons
Sciences open to the Commons
Commons open to the Campus
Brick Masonry
Weathering Steel Fins
Custom Framed Curtianwall
DAYLIGHT Optimizing Glazing for Daylight Harvesting
DAYLIGHT Optimizing Glazing for Daylight Harvesting
GLAZING’S IMPACT ON THERMAL COMFORT IN THE WINTER
Radiant Discomfort
Downdraft Discomfort
PERIMETER RADIANT HEAT To counteract cold radiant temperatures and downdraft, supplemental perimeter heat is required.
GLAZING & WINTER COMFORT Office Windows
Glazing U-Value 0.38 0.25
IMPROVED THERMAL PERFORMANCE Minimizing Thermal Bridges
R-13
R-20 +50%
Reduce
Annual Heating
Peak Cooling
Maintain
Transparency
Thermal Comfort
Visual Comfort
Framing the Challenge
WEST FAÇADE Solar exposure
PEAK COOLING LOAD PROFILE The Commons Area
IGU SELECTION
56% VLT 15% VLR (Outside)
0.16 COG U-Value 0.25 Assembly
0.28 SHGC XXX
! Low Iron Glass ! Neutral Color Coatings ! Anti-Reflective Glass
! Triple Insulating Glass ! Low-e (surf #2) ! Coated Polyester ! Ceramic Frit Suspended Films ! Interior Shading ! Gas-filled Interspace Systems ! Second low-e (surf #4) ! Warm edge spacer
IGU SELECTION
56% VLT 15% VLR (Outside)
0.16 COG U-Value 0.25 Assembly
0.28 SHGC XXX
! Low Iron GlassIncrease in! Triple Insulating Glass ! Low-e (surf #2) ! Neutral Color Coatings ! Coated Polyester ! Ceramic Frit Peak Cooling Suspended Films ! Anti-ReflectiveLoad Glass ! Interior Shading ! Gas-filled Interspace Systems ! Second low-e (surf #4) 0.35 SHGC ! Warm edge spacer
22%
0.25 System U-Value
Level 1 Commons
Level 1 Teaching Lab
Level 2 Research Lab
Level 3 Research Lab
DGP: 1.0
DGP: 0.25
DGP: 0.27
DGP: 0.26
Glare Analysis
Overcast skies (63% of afternoon hours)
Topography shading
Night time Sun on East
High solar gain (energy) 155 hours 7% afternoon hours
Low sun angles (glare) 569 hours 26% afternoon hours
Frequency of Direct Sunlight
33% (2.0) 47% (2.9) 62% (3.9)
46% (2.9) 48% (3.0)
8% (0.5) 29% (1.8) 40% (2.5)
32% (2.0)
17% (1.1) 22% (1.4)
29% (1.8) 32% (2.0)
29% (1.8) 11% (0.7)
11% (0.7)
Shade Deployment: Glare
62% (3.9)
100% (6.9)
33% (2.0)
30% (2.1)
47% (2.9)
63% (4.3)
46% (2.9)
71% (4.9)
48% (3.0)
86% (5.9)
8% (0.5) 29% (1.8) 40% (2.5)
32% (2.0)
17% (1.1) 22% (1.4)
29% (1.8)
0% (0)
32% (2.0)
0% (0)
11% (0.7)
0% (0)
29% (1.8) 11% (0.7)
Shade Deployment: Glare + Solar Load
- 6%
Decrease in Peak Cooling Load
Interior Shades
PERFORMANCE CONCEPTS Sustainable Opportunities
Radiant Panels Nighttime Flush Solar Chimney
Radiant Floors Displacement Ventilation
PERFORMANCE CONCEPTS Sustainable Opportunities
Mostly Radiant System
Mostly Convective System
PERFORMANCE CONCEPTS Sustainable Opportunities
Mostly Convective System
PERFORMANCE CONCEPTS Sustainable Opportunities
80%
Less energy than building replacement
72%
Of floor area with direct views to the outdoors
Questions?