Optimization of Kiln Drying for Softwood through Simulation of Wood Stack Drying, Energy Use, and Wood Color Change

Abstract

An integrated modeling system was developed to simulate the drying processing, energy use, and wood color change in kiln drying of softwood timber. The model has been applied for a temperature range from 50 to 70°C and an airspeed from 3 to 9 m/s. The model is based on theoretical analysis and contains components such as kiln configuration and practical operations. From the model simulation, optimized drying schedules for minimizing color change and energy use are recommended with dry bulb temperature of 60 to 70°C and wet bulb depression of 15 to 20°C.

Keywords:

• Computer model
• Energy use
• Kiln brown stain
• Wood color change
• Wood drying

AKNOWLEDGEMENTS

The authors greatly appreciate helpful discussion and valuable input by Professor Roger Keey of the University of Canterbury and Professor Gerry Carrington of University of Otago, New Zealand.