Abstract
A literature survey discovered eighteen publications containing equilibrium moisture content (EMC)/equilibrium relative humidity (ERH) data for rice. A total number of 763 experimental points were extracted from the literature, from which eighteen data sub-sets covering a temperature range were formed and used for the evaluation of EMC/ERH isotherm equations. Four commonly cited rice EMC/ERH equations, i.e., Modified-Chung–Pfost, Modified-Henderson, Modified-Oswin, and Strohman–Yoerger equations were compared for their ability to fit these data sub-sets based on three error parameters, i.e., residual sum of squares (RSS), standard error of estimate (SEE) and mean relative deviation (MRD). The comparison shows that the Strohman–Yoerger equation is the best equation for describing the EMC/ERH isotherms of rice. The Strohman–Yoerger equation was then used to fit the merged data sets describing the sorption process and rice variety and the best fitted coefficients are given. These fitted equations are based on a large data set and therefore provide a sound basis for future work on drying and storage of rice.
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