Condensation Risk in a Wood-Frame Wall: Application Library path Heat_Transfer_Module/Buildings_and_Constructions/wood_frame_wall
|
•
|
|
•
|
With the From heat and moisture transport analogy option, the heat transfer coefficient h to be multiplied by the analogy factor to obtain the moisture transfer coefficient hm should be specified. It can be User defined (in this case the Absolute pressure, pA, the External temperature, Text, and the External relative humidity, ϕw,ext should be specified) or selected from a list of heat transfer coefficients defined in Heat Flux features applied on the same boundary (in this case the external conditions defined in the corresponding Heat Flux feature are used).
|
|
•
|
For the External natural convection, Internal natural convection, External forced convection, and Internal forced convection options, the geometry and velocity parameters used in the correlation are the same as for the Heat Flux feature. Then the external conditions should be specified. First, set the Absolute pressure, pA. For User Defined, enter a value or expression. Else, select an Ambient absolute pressure defined in an Ambient Properties node under Definitions. In addition, enter an External temperature, Text. For User defined, enter a value or expression. Else, select an Ambient temperature defined in an Ambient Properties node under Definitions. Finally, set the External relative humidity, ϕw,ext. Note that the relative humidity at the boundary is provided by the physics interface.
|
|
•
|
If Relative humidity is selected (the default), set the External relative humidity, ϕw,ext, and the External temperature, Text (used for the computation of the vapor saturation pressure). For User defined, enter values or expressions. Else, select an Ambient relative humidity and an Ambient temperature defined in an Ambient Properties node under Definitions. Convective moisture flux is defined by g0 = βp(ϕw,extpsat(Text) − ϕwpsat(T)).
|
|
•
|
If Partial vapor pressure is selected, enter an External partial vapor pressure, pv,ext. Convective moisture flux is defined by g0 = βp(pv,ext − ϕwpsat(T)).
|
|
|
Condensation Risk in a Wood-Frame Wall: Application Library path Heat_Transfer_Module/Buildings_and_Constructions/wood_frame_wall
|