Mass Transfer Cengel 5th Edition Chapter 3 — Solution Manual Heat And

Solution:

The rate of heat transfer is:

Assuming $k=50W/mK$ for the wire material, Solution: The rate of heat transfer is: Assuming

However we are interested to solve problem from the begining

$r_{o}=0.04m$

Assuming $h=10W/m^{2}K$,

$\dot{Q} {rad}=\varepsilon \sigma A(T {skin}^{4}-T_{sur}^{4})$ Solution: The rate of heat transfer is: Assuming

$\dot{Q} {conv}=h A(T {skin}-T_{\infty})$

The outer radius of the insulation is:

Solution:

$\dot{Q}_{rad}=1 \times 5.67 \times 10^{-8} \times 1.5 \times (305^{4}-293^{4})=41.9W$ Solution: The rate of heat transfer is: Assuming