(13)
The critical moisture content depends not only on the material and shape but also on velocity and temperature of the drying air. Since many factors affect the critical moisture content, we used the mean value of the critical moisture content shown in Table. The equilibrium moisture content is influenced by relative humidity and temperature of surrounding air. The equilibrium moisture content is usually close to zero at high temperatures and relative humidity.
3.2.2 Convective heat and mass transfer coefficient
Heat and mass transfer coefficient is calculated by using Eqs. (14) and (15).