2021
Up and Running with the Passive House Planning Package (9.7 IP) Module 2 | Class 2 | Components
Q: How do you calculate annual the heat loss of a window? A: QT-srfc = Areawin ( ft2 )
In 1. 2. 3. 4.
U-Valuewin ( Btu / hr-ft2-F )
ft (%)
Gt ( kFhr / yr)
order to calculate the transmission heat loss for each surface of a building, we need to: Determine the window area Determine the window’s U-Value Determine the temperature correction factor Determine the annual difference in temperature between inside and outside
bldgtyp | NYPH
NYPH: Up and Running with PHPP
1
2021
Q: How do you calculate annual the heat loss of a window? A: QT-srfc = Areawin ( ft2 )
In 1. 2. 3. 4.
U-Valuewin ( Btu / hr-ft2-F )
ft (%)
Gt ( kFhr / yr)
order to calculate the transmission heat loss for each surface of a building, we need to: Determine the window area Determine the window’s U-Value Determine the temperature correction factor Determine the annual difference in temperature between inside and outside
bldgtyp | NYPH
Window U-Value(s)
NYPH: Up and Running with PHPP
2
2021
Ug U-Value of the Glass
Uf U-Value of the Frame
Uw U-Value of the Window
Uw-installed U-Value of the Window in the Wall
bldgtyp | NYPH
Uw-installed = (Ag
Ug) + (Af
Uf) + (Lspacer
Ψspacer) + (Linstall
Ψinstall)
Awindow
bldgtyp | NYPH
NYPH: Up and Running with PHPP
3
2021
Uw-installed = (Ag
Ug) + (Af
Uf) + (Lspacer
Ψspacer) + (Linstall
Ψinstall)
Awindow
bldgtyp | NYPH
Uw-installed = (Ag
Ug) + (Af
Uf) + (Lspacer
Ψspacer) + (Linstall
Ψinstall)
Awindow
bldgtyp | NYPH
NYPH: Up and Running with PHPP
4
2021
bldgtyp | NYPH
Inputs: Uglass
Tested as per EN 673 / ISO 10292 Technically, should be reported out to 2 decimal places
bldgtyp | NYPH
NYPH: Up and Running with PHPP
5
2021
Inputs: Uframe
bldgtyp | NYPH
Tested as per ISO 10077-2 EACH frame element should have it’s own U-f value
bldgtyp | NYPH
NYPH: Up and Running with PHPP
6
2021
bldgtyp | NYPH
bldgtyp | NYPH
NYPH: Up and Running with PHPP
7
2021
Frame U-Value? ‘Panel’
bldgtyp | NYPH
Different Values for Different Edges?
Head U-0.99 W/m2k
Meeting Rail U-2.0 W/m2k
Sill U-1.1 W/m2k
Jamb U-0.99 W/m2k
bldgtyp | NYPH
NYPH: Up and Running with PHPP
8
2021
Frame Width?
Normal Frame
Mulled Frame
bldgtyp | NYPH
Dealing with Mullions
½ to one side
½ to the other
bldgtyp | NYPH
NYPH: Up and Running with PHPP
9
2021
PsiSpacer ? Sometimes labeled “Psi-g” or “Psi-Glazing-Edge”
bldgtyp | NYPH
PsiInstall ?
bldgtyp | NYPH
NYPH: Up and Running with PHPP
10
2021
Calculating Psi-Installs
https://www.passivehousecanada.com/wpcontent/uploads/2019/09/BC_Reference_Procedure_PHPP_Window_Values_Using_THERM_1.1.pdf bldgtyp | NYPH
Psi-Installs at Mulled Frames?
bldgtyp | NYPH
NYPH: Up and Running with PHPP
11
2021
Psi-Installs at Mulled Frames? •
‘1’ means do apply the Psi-Install along this edge
•
’0’ means do not apply the Psi-Install along this edge (apply at 0%)
•
Any other number input gets applied as the PsiInstall (can override the Components worksheet this way)
bldgtyp | NYPH
•
For even more complex situations, you can override the 1 | 0 with formulas.
•
For the edge here, you could enter: " = (3’-6” / 7’-6”) * Psi-Install "
bldgtyp | NYPH
NYPH: Up and Running with PHPP
12
2021
How does all this compare to NFRC? sadly, it doesn’t….
bldgtyp | NYPH
NYPH: Up and Running with PHPP
13
