Question

A 5cm OD and 0.5cm thick copper pipe [k=386W/m.°C] has hot gas flowing inside at a temperature of 200°C with a heat transfer coefficient of 30W/m2.°C. The outer surface dissipates heat by convection into the ambient air at 20°C with a heat transfer coefficient of 15W/m2.°C. determine the heat loss from the pipe per meter length

Answer 1

Q=260.96W/m

Step-by-step explanation:

you should raise the heat transfer equation between the inner part of the tube and the outer part taking into account the convection and conduction resistances

as they are asking us for the heat per unit length, then the conduction and convection resistances are like this

Rh=1/(hDpi)

Rc=ln(De/Di)/2piK

I attached the complete procedure