including a contact resistance of 0.1 K/W at each of the interfaces. but assume that instead of surface temperatures, the given temperatures are those of air on the left and right sides of the wall and that the convective heat transfer coefficients on the left and right surfaces are 6 and 10 W/(m2K), respectively.

GIVEN

• Composite wall

• Thermal conductivities

? kA = 70 W/(m K)

? kB = 60 W/(m K)

? kC = 40 W/(m K)

? kD = 20 W/(m K)

• Air temperatures

? Left side (TA?) = 200°C

? Right side (TD?) = 50°C

• Contact resistance at each interface (Ri) = 0.1 K/W

• Convective heat transfer coefficients

? Left side ( cA h ) = 6 W/(m2 K)

? Right side ( cD h ) = 10 W/(m2 K)

FIND

(a) Rate of heat transfer through the wall (q) (b) Temperatures at the interfaces

ASSUMPTIONS

• One dimensional, steady state conduction

SKETCH


The thermal circuit for the composite wall with contact resistances and convection from the outer

surfaces is shown below



The values of the individual conductive resistances, are.



The values of the convective resistances,



(a) The total resistance for this system is



The total rate of heat transfer through the composite wall is given by



(b) The surface temperature on the left side of material A (TAs) can be determined by examining the

convection from the surface of material A





Physics & Space Science

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