solve only 4th

3. Steam is condensing on the inside of a copper tube of 10 mm ID and 11 mm OD with a convective heat transfer coefficient of 2000 W/m2K. On the outside, air is flowing at a velocity of 25 m/s and the convective heat transfer coefficient is 50 W/m2K. If the steam is at a saturation temperature of 150C and the ambient temperature is 30C, then find the steam condensation rate (in kg/s) over 2 m length of the tube. Take thermal conductivity of copper to be 385 W/mK and the latent heat of vapourization of steam to be 220 kJ/kg. 4. You wish to increase the heat transfer rate in Problem #3 by 25% using rectangular fins. A manufacturer can give you a finned tube of a fin thickness of 1 mm and length of either 5 mm or 15 mm. Which one would you choose and why? Substantiate with a fin heat transfer calculation