Refrigerant fluid at $20\backslash$deg C flows through a long AISI $316$ stainless steel tube Refrigerant fluid at $-20C$ flows through a long AISI $316$ stainless steel tube

with a convection heat transfer coefficient of $44W{m}^{-2}{K}^{-1}$ between the fluid

and the inner surface of the tube wall. The tube's internal diameter is $30$ mm

and the wall thickness is $2$ mm $.$ Insulation of thermal conductivity

$0\mathrm{.}04W{m}^{-1}{K}^{-1}$ and radial thickness $20$ mm is wrapped outside the tube.

Outside the insulation, there is air at a freestream temperature of $30C$ with a

heat transfer coefficient of $18W{m}^{-2}{K}^{-1}.$ Calculate the rate of heat transfer from

the surrounding air to the fluid, per unit length of tube, in steady state.

with a convection heat transfer coefficient of $44$ W m$2$ K$1$ between the fluid

and the inner surface of the tube wall. The tube$$s internal diameter is $30$ mm

and the wall thickness is $2$ mm$.$ Insulation of thermal conductivity

$0\mathrm{.}04$ W m$1$ K$1$ and radial thickness $20$ mm is wrapped outside the tube.

Outside the insulation, there is air at a freestream temperature of $30\backslash$deg C with a

heat transfer coefficient of $18$ W m$2$ K$1.$ Calculate the rate of heat transfer from

the surrounding air to the fluid, per unit length of tube, in steady state.