An analytical solution was developed to describe the influence of the transportation rollers on the heat transfer at the underside of flat products in roller heart kilns. Thus determined heat flow differs only about maximum 15 percent from the numerically calculated using partial differential equations. The effects of the roller’s material, the diameter, the velocity of the product and the gas temperature on the heat transfer can be described relatively simple for each roller. Examples shows, like the heat transfer will increases with the heat penetration coefficient of the roller and the velocity of the product. An analytical solution, to calculate the heat transfer in roller kiln with radiant tubes, was introduced. Developed simply equation can be use to analyse heat flow on the surface of the product. An influence of diameter of the radiant tube or influence of the distance between radiant tubes can be estimated simply and very quick. Temperature distribution in the plate-shaped product for different materials (Steel, SiC, Al2O3) and thickness was 2-dimensional numerical calculated with FEM-Application ANSYS. Simply analytically, in this work described, equations were used for the boundary conditions.
Roller kiln, radiant tube, roller, heat transfer, analytical solution, FEM