The paper investigates the hydrodynamic behavior of thermal agents as they move through a stationary layer of plant renewable raw materials in the filtration drying process. Among the materials investigated were the fruits of the common oak (Quercus robur L.) and the seeds of horse chestnut trees (Aesculus hippocastanum), which can be used for energy purposes in the future to produce alternative fuels. As a result of laboratory studies, calculation dependencies were obtained to predict the influence of thermal agent parameters and material layer height on its hydraulic resistance. These dependencies are important for practical applications on an industrial scale, particularly for calculating drying equipment parameters and assessing the energy efficiency of this process. Based on the experimental studies, the computer modeling of the process was modeled using the ANSYS Fluent 2022 R2 computational package, which made it possible to generalize the process of thermal agent movement through the porous layer of acorns and horse chestnut fruits. The values of the obtained hydraulic resistances were compared with those of the experimental ones. The average values of modeling deviations were determined for the interval of the studied layer heights H = 80 ÷ 120 mm, which is 2.64% for acorns and 1.92% for horse chestnut fruits. The computer modeling technique shows good convergence of results, which indicates the possibility of its use for the design of industrial drying equipment.