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By incorporating the advantages and the disadvantages of rotary and fluidized bed dryers, filtration dryer was introduced for grinded artichoke stems drying due to its expected lower energy consumption. The influence of the heat agent temperature (from 313 to 373 K) on kinetics during filtration drying of grinded artishoke stems was investigated. The kinetic curves of grinded artichoke stems was characterized by long period of partial saturation of the heat agent by moisture according to the filtration drying mechanism. Due to the complexity of the filtration drying mechanism, the necessity of the effective moisture diffusivity determinаtion was proved. Effective moisture diffusivity was determined using the Fick’s law at five heat agent temperatures (293, 313, 333, 353 and 373 K). Effective moisture diffusivity values at different temperatures Т eff D were determined to be from 0.396 × 10–10 to 11.103 × 10–10 m/s for grinded artichoke stems: According to Arrhenius equation, the activation energy Ea and the pre-exponential factor Do were calculated to be 24 kJ/mol and 1.24.10 m/s, respectively. Deduced equation allows to calculate theoretically the effective moisture diffusivity for the grinded artichoke stems within temperature range of 293‒373 K. Кеу words: renewable energy, filtration drying, grinded artishoke stems, heat agent temperature, Arrhenius equation, activation energy.

ACTIVATION ENERGY AND EFFECTIVE MOISTURE DIFFUSIVITY DETERMINATION IN DRYING OF GRINDED ARTICHOKE STEMS