This work concerns an experimental study of beef drying with a mixed tunnel solar dryer with forced convection. Drying experiments were carried out at the Centre for Study and Research on Renewable Energies (CERER). The evolution of air and product temperatures as a function of irradiance and the position of the racks was studied, as well as the effect of treatment and air temperature on drying speed. The experimental curves presented in terms of reduced moisture content as a function of drying time are approximated by mathematical models of existing drying kinetics. The effective diffusion coefficients of the different samples with their treatment were determined essentially based on an approximation of the logarithm of the reduced humidities by the solution developed by Cranck on the diffusion equation. The values found for the effective diffusivity are 2, 6669〖10〗^(-8) , 2, 9630210〖10〗^(-8) and 3, 40115〖10〗^(-8) respectively for the samples with peanut paste, with spices and without pre-treatment. The analysis of these results allowed to conclude on the thermal performance of the dryer but also that the "Henderson and Pabis", "Midilli et al" and "Logarithmic" models can be proposed respectively as the most reliable models to describe the evolution of the reduced moisture content as a function of time of the sample without treatment, with peanut paste and with spices.
