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## Heat Transfer from Extended Surfaces (FINS)

#### 6.1 Introduction

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:

Q = hAs(Ts - T),

where, h = heat transfer coefficient between the surface and the ambient

 As = exposed area of the surface Ts = temperature of the surface, and Ta = temperature of the surroundings.

Now, if we need to increase the heat transfer rate from the surface, we can:

1. increase the temperature potential, (Ts - Ta); but, this may not be possible always ...

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