3. Air and water vapor independently permeate through the membrane.
Water and air permeances are constant and do not
depend on both feed air RH and transmembrane pressure difference.
The transmission rate is proportional to the partial pressure
difference between the two sides of the membrane.
4. Mass flow in the air chamber is described by Fick’s law of
diffusion.
5. Mass flow in the vacuum chamber is also described by Fick’s
law of diffusion equation.
6. The model is studied under isothermal steady state equilibrium.