$\dot{Q} {net}=\dot{Q} {conv}+\dot{Q} {rad}+\dot{Q} {evap}$

$r_{o}+t=0.04+0.02=0.06m$

$\dot{Q}=h \pi D L(T_{s}-T_{\infty})$

$\dot{Q}=h \pi D L(T_{s}-T

The heat transfer due to conduction through inhaled air is given by:

$\dot{Q}_{conv}=150-41.9-0=108.1W$

A 2-m-diameter and 4-m-long horizontal cylinder is maintained at a uniform temperature of 80°C. Water flows across the cylinder at 15°C with a velocity of 3.5 m/s. Determine the rate of heat transfer.