combined modeling efforts for the optimized facade: models, methods, materials presentation
DESCRIPTION
Combined Modeling Efforts for the Optimized Facade: Models, Methods, Materials presentation by Stéphane Hoffman, Morrison Hershfield, Facades+AM conference Seattle 2015TRANSCRIPT
Visualizing the impact of Thermal Bridging on the
design of High Performance Buildings
Stéphane HoffmanMorrison Hershfield
December 4th, 2015
2
Thermal Bridging
ASHRAE 1365- RP BC Hydro BETBG
Presentation Overview
3
Thermal Bridging 101
Data & Findings
Applications
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2
3
Thermal Bridging 101
• Highly conductive material that by-passes insulation layer
• Areas of high heat transfer
• Can greatly affect the thermal performance of assemblies
Effective Thermal Resistance
What is a Thermal Bridge?
Parallel Path Heat flow
6
Utotal
Area weighted average of un-insulated assemblies
Addressing Lateral Heat Flow
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Overall Heat Loss
Additional heat loss
due to the slab
oQQ slabQ
Overall Heat Loss
LQslab /=ΨThe linear transmittance
represents the additional heat
flow because of the slab, but
with area set to zero
The Guide
10
Applications
Evaluating Impact of Details
Determine Whole Building
Heat Loss
Shelf angle
Window Transition
Parapet
Slab
Corner
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Heat Flow Summary Example
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Opaque Wall Thermal Performance
Summary Example
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Visualization Tool
for Parametric Modeling
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Parametric Visualization Tool
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Parametric Visualization Tool
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Parametric Visualization Tool
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Parametric Visualization Tool
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Parametric Visualization Tool
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Parametric Visualization Tool
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Parametric Visualization Tool
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Parametric Visualization Tool
Future Trends
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• Increasingly difficult to
ignore thermal bridging
at intersections of
assemblies
• Move beyond simply
adding “more insulation”
• Better able to account
for thermal performance
of envelope
The Future
Questions