Maize is the second largest agricultural produce in France. To be acceptable on national and foreign markets, it must preserve its physico-chemical properties during the drying process that occurs after harvesting, specially the wet-milling quality which is measured, in our case, by the "Turbidity Test". We have tried to make a dynamic model which could simulate all transitory phenomena observed in a real industrial dryer (tempering, condensation...) and to predict its quality performance. This dryer conception tool, based on a simple compartmental analysis is useful for fast computations. This concept is described and compared with the experimental results.