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# (Problem 1-19, 4th edition; not in 5th) A 15 x 20 cm circuit board holds 120 closely spaced logic chips, each dissipating 0. If the heat transfer...

Please help with HW document i forgot these were due tomorrow!!

1. (Problem 1-19, 4 th ediTon; not in 5th) A 15 x 20 cm circuit board holds 120 closely spaced logic chips, each dissipaTng 0.12W. If the heat transfer from the back surface of the board is negligible, determine: a. the amount of heat this board dissipates in 10 hours b. ±he heat Fux on the surface of the board in W/m 2 . 2. (Problem 1-54, 4 th ediTon; 1-68, 5th) Superheated vapor Fows through a 5cm diameter x 10m long pipe at a rate of 0.3 kg/s. ±he surrounding air is at 20°C and the pipe surface is at a uniform 100°C. ±he vapor in the pipe loses 30°C of temperature from inlet to exit, and its speci²c heat is 2190 J/kg-K. ³ind the convecTve heat transfer coe´cient at the surface.
3. (Problem 1-56, 4 th ; 1-53, 5th) The inner and outer surfaces of a 4m x 7m brick wall, 30cm thick, are at 26°C and 8°C. The bricks have a thermal conduc±vity of 0.69 W/m-K. Find the rate of heat transfer through the wall, in Wa²s. 4. (Problem 2-43, 4 th ; 2-48, 5th) A spherical container has inner radius r 1 , outer radius r 2 , and thermal conduc±vity k . Assuming steady one-dimensional heat transfer, state the boundary condi±on on the inner surface for each of these condi±ons: a. A ³xed temperature of 50°C b. A heat ´ux of 45 W/m 2 toward the center c. Convec±on to an internal medium at T with a heat transfer coeµcient of h .
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