question 6 a phase change fluid at 74 c is pumped through 7 m of a mul
A phase change fluid at 74°C is pumped
through 7 m of a multi-layered pipe,
which is exposed to an external fluid
current at 22°C. The innermost layer is
made of steel (thermal conductivity 13
W/m/K), with inner and outer radii 40
mm and 52 mm, respectively. The
second layer is made of insulating
material (thermal conductivity 0.6
W/m/K), with outer radius equal to 70
mm. The convective heat transfer
coefficients associated to the internal
and external fluids are respectively
1,166 W/m2/K and 150 W/m2/K.
Calculate the heat transfer (absolute
value) through the pipe thickness in kW
to 1 decimal place.
Note: use pi=3.1415
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