The heat transfer model of a moving bed reactor was developed based on the mass and energy conservation laws using the single particle approach. Fig. shows schematically a co-current moving bed reactor and the control volume for which the analysis is performed. The MBR is modelled to lumped parameters to solid particles and lumped parameters to fluid phase. It is considered tubular, vertical and diluted, with each particle surrounded only by the dragging fluid. Inside the particles, a first-order irreversible chemical reaction takes place uniformly. Other assumptions are : steady state operation, physical and transport properties uniform and constant, spherical particles with a uniform and constant radius and uniformly distributed over the cross-section of the reactor, developed flow, fluid temperature and velocity profiles considered uniform in the cross-section of the reactor (particles and fluid may have different velocities), conveyor fluid transparent to thermal radiation, reactor wall considered as an isothermal blackbody, axial heat dispersion considered negligible in comparison with the advective energy flux, wall-particle radiative heat flux described by a linearized form of the Stefan-Boltzmann equation, negligible interaction effects between particles and particle-wall, and negligible thermal effects due to viscous dissipation or particle friction.