Simulating Solar Kiln Conditions using a Conventional Kiln

This study assessed the possibility of using a conventional laboratory kiln to simulate solar kiln conditions and developed a mathematical model to predict the timber quality and moisture content profile during drying. The simulated temperature in the kiln was modelled on the actual temperature of a solar kiln based on the climatic conditions of Vientiane, Laos. The modelling for moisture content profile in boards was implemented in Matlab codes, which combined fundamental equations and validated the model with measured data. Timber quality assessment was performed based on quality standard AS/NZS 4787 (2001). The simulation results were similar with the measured solar kiln temperatures to within less than 2 degrees C in a day. The modelling correctly described the MC profile decrease during the drying process when compared with measured data. Further work is required regarding the method of measuring the MC data and anatomical properties. Assessed against the standard, timber quality at the end of drying was all graded as Class "A", and timber distortion was within permissible limits.