A new semi-theoretical thin layer model for modeling the air drying of cocoa beans with overnight tempering at ambient temperature was developed. The new model was a combination of the Page and two-term drying model. Results showed that the new model was found best described the drying process under the conditions tested (60, 70 and 80 degrees C). Effective diffusivities were found between 7.46 x 10(-11) and 1.87 x 10(-10) m(2)/s. The Arrhenius constant and activation energy were estimated at 8.43 x 10(-4) m(2)/s and 44.92 KJ/mol, respectively. Analyses of pH and cut test for bean quality showed that beans dried at 60 degrees C had lower acidity and good flavour quality as compared to other drying treatments. (c) 2008 Elsevier Ltd. All rights reserved.