2021
Up and Running with the Passive House Planning Package (9.7 IP) Module 1 | Class 4b | Thermal Bridges
‘Thermal Bridge’ ?
Any place in the building envelope where the otherwise uniform thermal resistance is significantly changed due to: full or partial penetration of the insulating layers by materials with a different thermal conductivity and/or a change in thickness of the insulating layers and/or a difference between internal and external areas, such as occurs at wall/floor/ceiling junctions.
bldgtyp | NYPH
NYPH: Up and Running with PHPP
1
2021
‘Thermal Bridge’ ? Repeating Thermal Bridges Included as part of the U-Value
Non-Repeating Thermal Bridges Included separately from the U-Value
bldgtyp | NYPH
NYC DOB Method NYC DOB: How-to Guide: Supporting Documentation
0.060
0.086
bldgtyp | NYPH
NYPH: Up and Running with PHPP
2
2021
PHPP Method
bldgtyp | NYPH
That’s what Psi-Values are For! PSI Sketchup Face
Sketchup Face
! bldgtyp | NYPH
NYPH: Up and Running with PHPP
3
2021
Q: How do you calculate annual the heat loss of a Thermal Bridge?
A: QT-tb = Lentb ( ft )
In 1. 2. 3. 4.
Psi-Valuetb ( Btu / hr-ft-F )
ft (%)
Gt ( kFhr / yr)
order to calculate the transmission heat loss for each surface of a building, we need to: Determine the TB Length Determine the surface’s Psi-Value Determine the temperature correction factor Determine the annual difference in temperature between inside and outside
bldgtyp | NYPH
bldgtyp | NYPH
NYPH: Up and Running with PHPP
4
2021
TB in the Areas Worksheet
bldgtyp | NYPH
Psi-Values?
NYPH: Up and Running with PHPP
5
2021
Where do Psi-Values Come From?
1. 2. 3. 4.
Building Codes Engineering Reference Documents Pre-Certified Construction Systems 2 or 3-D Heat Flow Simulations
bldgtyp | NYPH
Building Code (NYC ECC2020)
bldgtyp | NYPH
NYPH: Up and Running with PHPP
6
2021
Catalogs
https://passipedia.org/basics/building_physics_-_basics/thermal_bridges/thermal_bridges_catalogue
bldgtyp | NYPH
ISO 14683
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NYPH: Up and Running with PHPP
7
2021
BC Hydro Online Guide
https://betb.ca/
bldgtyp | NYPH
PHI Certification Documents
bldgtyp | NYPH
NYPH: Up and Running with PHPP
8
2021
Calculate Your Own
bldgtyp | NYPH
NYPH: Up and Running with PHPP
9