5. A mild steel plane wall separates water and air. It is proposed to increase the heat transfer rate between these two fluids by adding straight rectangular fins of 1.25 mm thickness and 2.5 cm in length, spaced 1.25 cm (pitch). What percentage increase in heat transfer can be achieved if fins are placed on (a) water side, (b) air side (c) both sides? Data: Fin effectiveness for air side is 96%, Fin effectiveness on water side is 55%, Heat transfer coefficient of air side = 11 W/mK , Heat transfer coeffient of water side = 225 W/mK. (hint: take 1mx1m surface area of the plane wall as reference for calculation