Drying of solid particles is generally divided into three periods: a short initial heating period, a constant drying rate period, and a falling drying rate period. Drying in a fixed under various drying conditions was experimentally studied. The main goals of the measurements were to calculate the heat transfer coefficient based on the measured values, and to evaluate the validity of the constant drying rate period. The exact duration of the constant drying period concerning the entire bed is short. The calculated heat transfer coefficients seem to be somewhat reasonable.