Application of simulation methods is an efficient and powerful
tool for evaluation and display of thermal processes in the food
industry (Wang and Sun, 2003). In the past, these mechanisms
were described with models of varying complexity. The simplest
models only account for the mass transfer, assuming the drying
process evolves under quasi isothermal conditions (Akpinar et al.,
2003). The second degree of detail includes the heat and mass
transfer under consideration of the temperature dependent diffusion
coefficient. The use of empirical and semi-empirical models is
very popular in this context. Several authors have applied these
approaches for the simulation of apple