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Consider an integrated circuit board (15cm x 20cm) with a number of aluminum fin

ID: 2997419 • Letter: C

Question

Consider an integrated circuit board (15cm x 20cm) with a number of aluminum fins (k = 237 W/m-K) attached on one side of it. Each fin is 4cm long and has a 2mm x 2mm square cross section. The surrounding ambient temperature is 25oC and the convection heat transfer coefficient on each fin surface is 20 W/m2-K. If the surface temperature of the circuit board is to be maintained at 85oC, and an overall fin effectiveness of 3 is required, determine the number of fins that will be needed.  


4 cm 2 mmX2 mm T-85°C Tc= 25°C

Explanation / Answer

Answer: 207 fins.)

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