Question: A 3 0 - c m hot square surface at 7 8 C is to be cooled by attaching 4 - c m - long

A 30-cm hot square surface at 78C is to be cooled by attaching 4-cm-long atuminum (k=237WmSC) fins of 2-mm cylindrical pins. The temperature of surrounding. medium is 32C and the heat transfer coefficient on the surfaces can be taken to be 20Wm2*C. It it is desired to triple the rate of heat fransfer from the bare hot surface, determine the number of fins that needs to be attached.
A 3 0 - c m hot square surface at 7 8 C is to be

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