Abstract

A compartment/population balance model is presented for describing heat transfer in gas-solid fluidized bed heat exchangers, modelling the particle-particle and particle-surface heat transfers by collisions. The results of numerical experimentation, obtained by means of a second order moment equation model indicate that the model can be used efficiently for analysing fluidised bed heat exchangers recovering heat either by direct particle-fluid heat exchange or indirect tube-in-bed operation mode. The population balance model is validated with physically measured data taken from the literature.