The drying process in porous media is one of the most complex processes encountered in engineering and has a vital role in many different industrial fields. In order to understand the drying behavior of a porous medium, both numerical simulation and experimental work need to be considered. In simulating the drying process of a porous medium (the forward problem), a continuous approach can be used. The continuous approach is based on a description of the system as a fictitious continuum by using effective coefficients of heat and mass transfer. In order to determine these coefficients, the so-called inverse problem must be solved, where drying experiments are realized and the data obtained from experiments are used in connection with the help of the numerical simulation (forward problem). In this contribution, the authors present a frame work for solving both the forward and the inverse problem taking into account the pore size distribution of the porous medium.