Abstract

Moisture equilibrium data for adsorption and desorption of water from meadow giass (Festuca pratensis) were investigated at a temperature range of 20 - 50°C and water activity from 0.3 to 0.99. The experimental procedure used was a gravimetric dynamic method with continuous registration of sample weight changes. A special laboratory drying device has been developed for the purpose. Sorption capacity decreases as temperature increases. Rehydration of the dried material results in hysteresis, hour models available in the literature (Chung-Pfost, Halsey, Henderson, and Oswin) were evaluated to determine the best fit for the experimental data. The Oswin equation was a good model for moisture adsorption and desorption of Festuca pratensis.

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