Assignment 4 on Heat Transfer

# Assignment 4 on Heat Transfer - PHY242H5S Assignment 4 on...

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k 2 T W T C k k 1 ( a ) T W T C k 1 ( b ) PHY242H5S Problems (2) A 1000-W iron is left on the iron board with its base exposed to the air at 20°C. The convection heat transfer coefficient between the base surface and the surrounding air is 35 W/m 2 · °C. If the base has an emissivity of 0.6 and a surface area of 0.02 m 2 , determine the temperature of the base of the iron. 8 2 4 5.67 10 W/m K Assignment 4 on Heat Transfer Iron 1000 W (1) Two cylindrical rods are identical, except that one has a thermal conductivity k 1 and the other has a thermal conductivity k 2 . As the drawing shows, they are placed between two walls that are maintained at different temperatures T W (warmer) and T C (cooler). When the rods are arranged as in part a of the drawing, a total heat Q flows from the warmer to the cooler wall, but when the rods are arranged as in part b , the total heat flow is Q . Assuming that the conductivity k 2 is twice as great as k

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## This note was uploaded on 09/29/2011 for the course PHY 242 taught by Professor Ghobriel during the Fall '10 term at University of Toronto.

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Assignment 4 on Heat Transfer - PHY242H5S Assignment 4 on...

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