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Tuesday, 24 April 2018

Isothermal drying kinetics of oil palm trunk: Energy and shrinkage evaluation



Oil palm trunk (OPT) is one of the alternative resources for building materials. This research investigated the drying characteristics of OPT blocks of dimension 43.91 mm × 19.73 mm × 15.82 mm by controlling the relative humidity under an isothermal condition. The isothermal temperature condition selected for this study were 25, 30, 35, and 40°C. The obtained drying data were applied to Logarithmic, Wang‐Singh, Page, Midilli‐Kucuk, Henderson‐Pabis, Newton, and Nadhari models. The drying kinetics were evaluated through these models. The suitability of these models was assessed based on the sum of square error, the coefficient of determination (R2), the reduced chi‐square (χ2), and root mean square error. The Nadhari model was found to be a suitable model for explaining the drying behavior of OPT at various isothermal temperature conditions. The effective diffusivity, drying rate, porosity, and shrinkage were found to be increasing with the increasing of isothermal drying temperature. The activation energy of OPT during drying was found to be 35.56 kJ/mol. © 2017 American Institute of Chemical Engineers Environ Prog, 36: 1244–1252, 2017

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