ENHANCEMENT OF THE HALSEY EQUATION FOR CANOLA ISOTHERMS

The goodness-of-fit of the Halsey, Modified-Henderson, and Chung isoth erm equations, as they were applied to 56 canola isotherms, is discuss ed. The Halsey equation was modified to improve the goodness-of-fit of these isotherms. The modified model is valid for equilibration temper atures between 3.5 and 75 degrees C, relative humidities from 15 to 92 % and moisture contents in the range of 4 to 23% db. The canola was ex posed to five drying-rewetting cycles and to dehydration temperatures of 25 and 50 degrees C. The modified Halsey equation was found to be c apable of expressing canola isotherms exposed to multiple drying and r ewetting cycles. The dependency of temperature and drying-rewetting cy cles was also examined. A mathematical equation that related the equil ibrium relative humidity (ERH) to equilibrium moisture content (EMC), equilibrium temperature, and drying-rewetting cycles is proposed.