Question

Oil at 150°C flows slowly through a long, thin-walled pipe of 25-mm inner diameter. The pipe is suspended in a room for which the air temperature is 20°C and the convection coefficient at the outer tube surface is 11 W/m2·K. Estimate the heat loss per unit length of tube, in W/m.

Answer 1

Q=112.31 W/m

Step-by-step explanation:

Given that

Oil temperature T₁= 150°C

Air temperature T₂= 20°C

Heat transfer coefficient h= 11 W/m²K

Diameter ,d= 25 mm

The heat loss given as

Q= h A ΔT

A= πdL

Q= h ( πdL)ΔT

Heat loss per unit length

Q= h ( πd)ΔT

Now by putting the values

`Q=11* \pi * 0.025* (150 - 20)\ W/m`

Q=112.31 W/m

Therefore heat loos will be 112.31 W/m