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Unformatted text preview: Consider a composite slab is made up out of two different materials, with length L 1 and L 2 , and with thermal conductivity k 1 and k 2 , is placed between two heat baths (see Figure 17.4). Suppose that the temperature of the interface between the two slabs is equal to T x . The amount of heat flowing from T H to T x is given by The amount of heat flowing from T x to T C is given by Of course, the heat flowing through slab 1 must equal the heat flowing through slab 2. Thus Figure 17.4. Heat transport through a composite slab. This equation can be used to obtain the temperature at the interface between slab 1 and slab 2: The heat flowing through the slab can now be calculated easily A composite slab therefore has a thermal resistance equal to the sum of the thermal resistance of each of the individual slabs....
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- Fall '09