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A section of a composite wall with the dimensions shown below has uniform temperatures of 200°C and 50°C over the left and right surfaces, respectively. If the thermal conductivities of the wall materials are: kA = 70 W/(m K), kB = 60 W/(m K), kc = 40 W/(m K) and kD = 20 W/(m K), determine the rate of heat transfer through this section of the wall and the temperatures at the interfaces.
GIVEN
A section of a composite wallThermal conductivitieskA = 70 W/(mK)kB = 60 W/(mK)kC = 40 W/(mK)kD = 20W/(mK)Surface temperaturesLeft side (TAs) = 200°CRight side (TDs) = 50°C
ASSUMPTIONS
One dimensional conductionThe system is in steady stateThe contact resistances between the materials isnegligible
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