@emmanuelgee do you mean using HVAC pressure in order to model the vapor pressure difference across the envelope? I don’t think THERM has a way to do this.
I’m a novice THERM user, so as far as I know in THERM, only radiation, convection (through coefficients), and conduction loads will participate in the construction assembly’s heat balance. As such, THERM’s condensation potential merely represents the potential of a surface temperature reaching it’s dewpoint temperature within the scope of that simplified, steady-state thermal environment (at a specified internal relative humidity and temperature difference).
The main barrier in modeling vapor drive is that THERM doesn’t take into account the vapor pressure difference, material permeability that determines vapor drive across materials.
That being said, it’s technically possible to do a steady state calculation to model vapor drive with provided material permeability, and vapour pressure difference information. And with WUFI, do it while taking into account transient (changing) heat and mass storage. I just don’t think THERM has those capabilities.
S