WUFI Analysis Assumptions

WUFI Analysis Assumptions

Software: WUFI Pro 5.1 (1-d)

Orientation:  Each assembly was modeled facing the direction of prevailing wind-driven rain and maximum solar exposure as follows, for a vertical wall and building height up to 10m tall –

Vancouver (east), Edmonton (west), Toronto (east), Montreal (south-west), St. John’s (south-east)

Rain load: R1 (0), R2 (0.07 s/m) default settings

Surface Transfer Coefficients:

Exterior surface

Heat resistance – 0.0588 (m2K/W), external wall, wind dependant

Sd value – No coating

Short wave radiation absorptivity – 0.68 (red brick)

Long wave radiation emissivity – 0.90

Adhering factor of rain – 0.7 according to inclination and construction type

Interior surface

Heat resistance (m2K/W) – 0.125 (External wall)

Sd value – User defined 0.3 (approximates two coats of latex paint)

Initial Conditions:

Initial moisture in component – Constant across component

Initial temperature in component – Constant across component

Initial relative humidity – 0.80

Initial temperature – 200C


Each wall modeled for a simulation period of 5-9 years

Mode of calculation:

Heat transport calculation, moisture transport calculation

For thermal conductivity use temperature and moisture dependency

No hygrothermal special options

 Numerical parameters

Increased accuracy

Adapted convergences

No adaptive time step control



Outdoor climate

Cold year when an option, from map/file, (using analysis function for choosing worst case orientation)

Indoor climate

User defined sine curve parameters

Temperature, mean 210C with +/- 20C (day of maximum 06/03)

Relative humidity, mean 45% with +/- 15% (day of maximum 08/16)


*** (Material properties coming soon) ***