Question

Question 1 You are requested by your company to access the possibility of using river water to cool a heat transfer fluid in your company as you have just completed Thermal System course at Faculity of Engineering, UM Condition of the river water The river water flows at an average temperature of 15 C at a flowrate of 2 m'/s Your design A 15-m-long section of a circular duct of Alloy 2024-T6 with inner diameter of 20cm and wall thickness of 1cm. The outer wall of the duct is covered with dirt and mud with thickness of 2mm and its conductivity can be approximated 1.3 W/mk. The duct is submerged under the river water. Hot air at 40 °C enters the circular duct at a velocity of 3 m/s ) Please state your properties selection, assumptions and its justification clearty in your evaluation Discuss your assumption of the boundary condition used (2 Marks) () Evaluate the possible outlet temperature of air as it leaves the underwater portion of the duct. (10 Marks) the system. Evaluate the fan osd required to overcome the flow resistance in the duct. Assume the duct is a smooth tube. A centrifugal fan (with efficiency of 55%) is used to circulate the air in (iii) (3 Marks)

Answer 1

In this solution some basic concepts and standard correlations and properties data for Heat Transfer are used. Please refer to any standard textbook for more information or drop a comment below. Don't forget to give a positive rating if solution is helpful.

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