Bed-to-wall heat transfer in a pressurized circulating fluidized bed is analyzed. The cluster renewal model is modified to account for the effect of pressure on heat transfer. Bed-to-wall heat transfer coefficients at different operating pressures were measured. The effects of system pressure, bed suspension density, particle size and superficial gas velocity were investigated in the tests. In addition to the modified model, a semi-empirical equation based on the lest data is proposed for the prediction of heat transfer coefficients. A comparison with experimental data in the literature, as well as those from the present work, shows a good agreement.