Details:Surface

Surface Transfer

Starting from specified initial conditions, WUFI computes the temporal evolution of the temperature and moisture distributions in the building component. This evolution is determined not only by the underlying transport equations which govern the processes in the component, but also by the heat and moisture exchange with its surroundings. Thus there are heat and moisture flows through the surfaces, the direction and magnitude of which depend on the conditions in the component as well as on the conditions in the surroundings.

The surface transfer coefficients indicate to which extent the conditions in the surroundings affect the building component, especially the heat and moisture flows through its surfaces.

The following help topics offer a discussion of the surface transfer coefficients used by WUFI:
 
Heat Transfer Coefficients
Water Vapor Transfer Coefficients
Water Vapor Diffusion
Surface Coatings
Short-wave Radiation Absorptivity
Long-wave Radiation Emissivity
Rain Water Absorption Factor
Rain Reduction Factor