heat flow - certainteed · !introduction to heat flow Œ conduction: transfer of heat between...
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Heat FlowHeat Flow
The Art of Building Science
smThe Art of Building Science
sm
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!Introduction to Heat Flow!Introduction to Heat Flow
!Heat always flows from a region ofhigh temperature to a region of lowertemperature
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!Introduction to Heat Flow!Introduction to Heat Flow
� Conduction: Transfer of heatbetween materials of differenttemperatures while in direct contact
! Three modes of heat flow
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!Introduction to Heat Flow!Introduction to Heat Flow
� Conduction: Transfer of heatbetween materials of differenttemperatures while in direct contact
� Convection: Transfer of heat dueto the motion of gas or liquid overa surface
! Three modes of heat flow
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!Introduction to Heat Flow!Introduction to Heat Flow
� Conduction: Transfer of heatbetween materials of differenttemperatures while in direct contact
� Convection: Transfer of heat dueto the motion of gas or liquid overa surface
� Radiation: Transfer of heat fromone object to another due toelectromagnetic waves
! Three modes of heat flow
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Benefits of ControllingHeat Flow in a HouseBenefits of ControllingHeat Flow in a House
!Occupant comfort
!Energy efficiency
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Heat FlowScientific Principles
Heat FlowScientific Principles
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Heat Transfer Problems & SolutionsHeat Transfer Problems & Solutions
!Roof/ceiling system
!Walls
!Windows
!Basements
!Crawlspaces & Slabs
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Roof/Ceiling
Systems
Roof/Ceiling
Systems
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Roof/Ceiling System ProblemsRoof/Ceiling System Problems
!Ceiling surfacecondensationand staining
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Roof/Ceiling System ProblemsRoof/Ceiling System Problems
!Underside of roofdeck deterioration
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Roof/Ceiling System SolutionsRoof/Ceiling System Solutions
!Cathedral ceilinginstallation
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Roof/Ceiling System SolutionsRoof/Ceiling System Solutions
!Properly support& protect kneewall insulation
InsulationInsulationSheathingSheathing
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Roof/Ceiling System SolutionsRoof/Ceiling System Solutions
!Properly insulaterecessed lighting
Infrared View
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Roof/Ceiling System SolutionsRoof/Ceiling System Solutions
!Insulate attichatch
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Roof/Ceiling System SolutionsRoof/Ceiling System Solutions
!Install atticbaffles tomaintaininsulationeffectiveness
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Wood Stud
Walls
Wood Stud
Walls
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Wood Stud Wall Insulation ProblemsWood Stud Wall Insulation Problems
!Uncomfortable occupant space
!Cold surfaces promote condensationand staining
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Wood Stud Wall System SolutionsWood Stud Wall System Solutions
!Qualityinstallation
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Wood Stud Wall System SolutionsWood Stud Wall System Solutions
!Avoid insulationvoids
Infrared View
insulation void
near top plate
VoidVoid
VoidVoid
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Wood Stud Wall System SolutionsWood Stud Wall System Solutions
!Blow-In-BlanketSystem (BIBS)
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Wood Stud Wall System SolutionsWood Stud Wall System Solutions
!Avoid insulationcompression
Compressed battCompressed batt
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Wood Stud Wall System SolutionsWood Stud Wall System Solutions
!Properly insulatearound plumbingand electricalpenetrations
Poor fitPoor fit
CompressedCompressed
VoidVoid
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Wood Stud Wall System SolutionsWood Stud Wall System Solutions
!Use insulatingsheathings toincrease overallR-value
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WindowsWindows
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Window ProblemsWindow Problems
!Uncomfortable interior space due toradiation heat flow
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Window ProblemsWindow Problems
!Uncomfortable interior space due toradiation heat flow
!Condensation due to cold window surfaces
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Window ProblemsWindow Problems
!Uncomfortable interior space due toradiation heat flow
!Condensation due to cold window surfaces
!Ultra-violet light exposure: Sunlightdegrades interior furnishings
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Window System SolutionsWindow System Solutions
Install high performance windowsLook for the NFRC label
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Window System SolutionsWindow System Solutions
! Frame type
! Glazing type
! Gas Fill
! Low-E coatings
Install high performance windowsLook for the NFRC label
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Window System SolutionsWindow System Solutions
Energy Star recommended maximums
U-factor � Like R-value,indicates thermal performance
0.75Southern Zone
0.40Central Zone
0.35Northern Zone
U-factor
Lower is better
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Window System SolutionsWindow System Solutions
Energy Star recommended maximums
Solar Heat Gain Coefficient �Indicates efficiency in preventingsolar radiation from heating house
0.40Southern Zone
0.55Central Zone
AnyNorthern Zone
SHGC
Lower is better
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Window System SolutionsWindow System Solutions
Installation is Critical!
Even the best windowswill perform poorly
unless they areinstalled correctly.
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BasementsBasements
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Below Grade BasementInterior ProblemsBelow Grade BasementInterior Problems
!Occupant comfort
!Energy efficiency
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Below Grade BasementInterior SolutionsBelow Grade BasementInterior Solutions
!Finished walls �Fill entire spacewith unfacedinsulation betweenfoundation wall andinterior sheathing
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Below Grade BasementInterior SolutionsBelow Grade BasementInterior Solutions
!Unfinished walls �Use perforated firerated facing
Perforated FSK facing
Perforated PSK facing
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Below Grade BasementInterior SolutionsBelow Grade BasementInterior Solutions
!Ceilings
� Conditioned space�Insulation improves sound control
� Semi-conditioned space�Insulation improves energy efficiency& comfort
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Crawlspaces
and Slabs
Crawlspaces
and Slabs
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Crawlspace ProblemsCrawlspace Problems
!Floor surface temperatures above crawlspace
!Energy efficiency above crawlspace
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Crawlspace SolutionsCrawlspace Solutions
!Ventedcrawlspace �minimum R-19should be installedin the floor/ceilingcavity for coldclimates
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Crawlspace SolutionsCrawlspace Solutions
!Unventedcrawlspace�floor/ceilingcavities or wallsshould be insulatedin warm-humidclimates
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Slab SolutionsSlab Solutions
!Some climates may require slab edgeinsulation
� Check your building codes
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Pay Attention
to Details
Pay Attention
to Details
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Pay Attention to DetailsPay Attention to Details
!Align air andthermal barriersin dropped ceiling
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Pay Attention to DetailsPay Attention to Details
!Properlyinsulatebathrooms tokeep tub andshower surfacescomfortable
VoidsVoids
Compression
Compression
Insulate here to finish job
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Pay Attention to DetailsPay Attention to Details
!Insulate, sheathand air sealkneewalls overgarages
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Pay Attention to DetailsPay Attention to Details
!Don�t miss insulatingaround ALLirregular details
� Bay windows
� Overhangs
� Dropped soffits
� Any irregular walls, etc.
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Control
heat flow��for comfort
and energy
efficiency.
View Air Flow Next