Module 4: Heat transfer calculations, miscellaneous topics and carbon credit
Lecture 34: Heat flow in furnaces and exchangers
Solution:
Heat balance: reference temperature
Air preheat temperature and exit temperature of flue gas are not known. Since quantities and entering temperatures of flue gas and air are same. We can write
(1)
Heat balance for the enlarged regenerator:
(2)
In equation 2, and are air and flue gas temperature at the exit of the regenerator.
and 
are air and flue gas temperature at the exit of the regenerator.
