Reconsider Problem 6.5. There is saturated steam flowing through a duct at a high velocity. You decide to use this steam to heat water. The water that is being heated starts out at 15◦C and needs to...

Reconsider Problem 6.5. There is saturated steam flowing through a duct at a high velocity. You decide to use this steam to heat water. The water that is being heated starts out at 15◦C and needs to be heated to a final temperature of 75 ◦C. The expected resistance that is due to fouling on the inside and outside of the pipe is

, respectively. After purchasing a 5-m-long (5-cm-ID) thin-walled copper pipe, having a roughness of 0.026 mm, you want to design a heat exchanger that can handle a flow rate of 10 L/min. Hint: Because the heat transfer coefficient of condensing steam is high, the resistance to heat transfer in the steam is negligible.

a. Determine the overall heat transfer coefficient using the pressure drop through the pipe.

b. What is the temperature of the saturated steam necessary to handle the load?

Problem 6.5