RT Journal Article
SR Electronic
A1 Štencl, Jiří
T1 Effect of temperature and water activity on heat transfer in parsley leaves in the range of temperatures 10-30 °C
JF Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis
YR 2014
VO 55
IS 5
SP 181
OP 186
DO 10.11118/actaun200755050181
UL https://acta.mendelu.cz/artkey/acu-200705-0023.php
AB The equilibrium moisture contents of parsley leaves were measured by the gravimetric dynamic method with continuous recording of changes in sample weight. Consequently water activity values were determined. Henderson equation was found to be a good model both for moisture adsorption and desorption. Isosteric heat of sorption was defined and determined in the temperature range of 10-30 °C. Clausius-Clapeyron equation was used to calculate the isosteric heat of sorption since no dependence on temperature in the analysed range was observed. The isosteric heats of sorption (q<sub>n</sub><sup>st</sup>) were indicated graphic in the form q<sub>n</sub><sup>st</sup> versus moisture content. Values for isosteric heat of sorption ranged from 54.41 to 46.85 kJ/mol.