You place two metal bars between two walls. One wall is held at a fixed temperat

Question

You place two metal bars between two walls. One wall is held at a fixed temperature of 25 degs C and the other is at 15 degs C. One bar is made of copper (thermal conductivity constant K_1 = 390 W/K*m) and has a cross sectional area of A_1 = 0.002 m^2. The other bar is made of nickel (thermal conductivity constant K_2 = 91 W/K*m) and has a cross sectional area of A_2 = 0.004 m^2. If the walls are separated by a distance of L = 45 cm, find the following: a. The direction of heat flow. b. The heat conducted through the copper bar in 1 hour. c. The heat conducted through the nickel bar in 1 hour. d. The total heat conducted between the walls.

Explanation / Answer

Heat will flow from low temp to high

Heat conducted =KA(T2-T1)t/d

For copper =390×0.002×10×3600/0.45=62400J

FOR nickel=91×0.004×10×3600/0.45=29120J

Total heat conducted=91520J

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