Module 4: Heat transfer calculations, miscellaneous topics and carbon credit
Lecture 32: Steady state heat flow in furnaces and heat exchangers
There is no heat loss to surrounding, so For ideal gases and in compressible fluids
(8)
(9)
Heat balance over a length of heat exchanger
(10)
is an overall coefficient for heat flow path consisting of a series of thermal resistances such tha
Here and are convective thermal resistance and is thermal resistance of the wall of thickness and of thermal conductivity due to conduction. Re-arrangement of equations 9 and 10 gives
of heat exchanger
and 
are convective thermal resistance and 
is thermal resistance of the wall of thickness 
and of thermal conductivity 
due to conduction. Re-arrangement of equations 9 and 10 gives
