In this chapter, we shall discuss heat transfer from extended surfaces, also called Fins.
Fins are generally used to enhance the heat transfer from a given surface.
Consider a surface losing heat to the surroundings by convection. Then, the heat transfer rate Q, is given by Newton’s Law of Cooling:
where, h = heat transfer coefficient between the surface and the ambient
A_{s} |
= exposed area of the surface |
T_{s} |
= temperature of the surface, and |
T_{a} |
= temperature of the surroundings. |
Now, if we need to increase the heat transfer rate from the surface, we can:
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