Heat is to be transferred from water to air through an aluminum wall. It is proposed that rectangular fins 0.05 in. thick and I in. long and spaced 0.08 in. apart be added to the aluminum surface to aid in transferring heat. The heat transfer coefficients on the air and water sides are 3 Btu/hr-ft2-~F and 250 Btulhr-ft2-oF,respectively. Evaluate the percentage of increase in heat transfer if these fihs are added to (a) the air side, (b) the water side, or (c) both sides. What conclusions may be reached regarding this result?
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