Technological parameters of infrared drying of plant raw materials

This article examines the key technological parameters of infrared (IR) drying of plant raw materials—one of the most promising energy-saving methods of thermal processing. Based on an analysis of scientific publications and dissertation research, particularly the works of G.V. Avrorov and V.A. Afonkina, the primary operating regimes and conditions affecting the efficiency and quality of the drying process have been identified. Special attention is given to parameters associated with carbon infrared heaters, which exhibit a high emissivity, directional radiation, and the ability to precisely control the emitted wavelength. It has been established that when optimal IR drying parameters are maintained—radiation temperature of 40–50 °C, wavelength of 9 μm, specific power of 300–400 W/m², and emitter-to-product distance of 10– 15 cm—energy consumption is reduced by 4–6 times compared to convective drying, while up to 60 % of thermolabile compounds, including vitamin C and essential oils, are preserved.