Heat Transfer Modeling and Analysis of a Rotary Regenerative Air Pre-heater

R. K. Krishna, R. Ramachandran, and P. Srinivasan
Birla Institute of Technology and Science
Rajasthan, India

An attempt has been made to sustain the efficiency of an air pre-heater(APH) in the long run. The APH is modeled using COMSOL Multiphysics in 3D and fed with real life conditions. Upon Heat transfer analysis, the temperature profile was found out and from that, the regions undergoing maximum thermal fatigue stress was identified.

The plates of the APH to the periphery are subjected to maximum temperature gradient and hence experience maximum thermal fatigue stress whereas the plates near the center experience the least.Replacing these plates with tougher material will sustain the performance in long run. Also, maximum heat transfer in the longitudinal direction happens towards the center and decrease as we move further from the center in the radial direction.