In the food industries, the agglomeration process is used to improve the food powder characteristics, providing a shorter wetting time, for example, and consists in the growth of the particle size. Fluidized beds are commonly used in this process. However, an important aspect in this process is the fluidization gas humidity, in this case the atmospheric air humidity, which interferes directly in the agglomeration efficiency. Therefore, before entering the agglomeration process the air passes through a dehumidifying unit to decrease the air humidity. These units usually utilize water for dehumidification, but Peltier modules can substitute the cooling fluid. This work presents a mathematical model of the air dehumidification process using Peltier modules.