Subtopic: Steady state heat transfer in conduction, convection and radiation
Question Statement:
The overall heat transfer coefficient based on the outside surface area of a tubular heat exchanger decreased due to fouling during operation from 1000 W m⁻²K⁻¹ to 800 W m⁻²K⁻¹. The fouling film coefficient of the heat exchanger in W m⁻²K⁻¹ is _______________