Equilibrum moisture content of Festuca pratensis in near ambient air drying conditions
2000
Stencl, J. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic))
The paper presents results of water sorption tests of meadow grass Festuca pratensis carrying out under laboratory conditions and mathematical analyses of obtained sorption isotherms. Moisture equilibrium data were investigated at air temperatures in the range of 20-50 deg C and water activity ranging 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 this purpose. Sorption capacity decreases as temperature increases. Rehydration of the dried material results in hysteresis but this phenomenon was small. Four models of equilibrium moisture content/equilibrium relative air humidity (Chung-Pfost, Halsey, Henderson, and Oswin) were evaluated for their ability to fit data for the samples tested. The modified Oswin equation was a good model for moisture adsorption and desorption of Festuca pratensis
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