intermittent drying has been used widely for agricultural material and others heat-sensitive materials due to its benefit is terms of energy saving, time saving and higher quality of the final product after drying. For example,in graing,intermittent drying reduces thermo-hydrical stresses and fissures,thus increasing product quality after drying and reducing drying time. intermittency strategies can include drying heat source,air mass flowrate ,air velocity,air pressure and air temperature variations ,where these parameters are periodicity turned on and turnd off,or surfer periodic variations ,or they are controlled by external parameters