Tomato soup is owing through a double-pipe heat exchanger 3 cm D 4 2 cm OD) with
ID: 702335 • Letter: T
Question
Tomato soup is owing through a double-pipe heat exchanger 3 cm D 4 2 cm OD) with saturated steam a 12 on the outside O hep pe Theco ective he attransfer coefficient between the soup to the pipe is 323 Wm2 K and the convective heat transfer coefficient between the steam to the pipe is very large. The thermal conductivity of the soup and pipe are 0.89 W/m K and 15.6 W/m K, respectively. For this system: a. The overall heat transfer coefficient for the inside of the pipe is smaller than the overal heat transfer coefficient for the outside of the pipe b. c. The steam provides heat by converting from vapor to liquid d. The log mean temperature difference for co-current and counter-current flow are the same, regardless of the inlet and outlet temperatures of the soup 1. 2. If the heat exchanger is 70 m long, what is U? a. 1929 W/m2 K b, 786 Wm2iK c 292 Wm2 K d. 209 Wm2 K 3. If the heat exchanger is 70 m long, what is the rate of heat transfer in kw? 8009 kW a. b, 3.07x10-5 Kw c. 114 kW d. 18.9 kWExplanation / Answer
1. The heat transfer coefficient for the outside of the pipe is very high compared to that inside the pipe. As a result, the overall heat transfer coefficient for the outside of the pipe is very high.
Therefore, option (a) is correct.