The calorific losses through the sidewalls delay drying, particularly in the higher racks of the foodstuff dryers, which provide us information on total drying time. One notes a temperature gradient of the air during its circulation upwards, between the entry and the exit of the empty dryer....

Dryer production capacity can be quantified by the effectiveness coefficient “Ef” defined by the product mass per unit of time in permanent and continuous production. This coefficient depends on the aerothermic parameters and the product quantity contained in the dryer. Previous studies...

The low thermophysical characteristics of air used as a heat transfer fluid in the solar collectors with thermal conversion require a fully developed turbulent flow. This increases the thermal heat transfer between the absorber plate and the fluid, which clearly improves the thermal performances...