Consider the encased pipe of 4.29, but now allow for the

Chapter , Problem 8.4

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Consider the encased pipe of 4.29, but now allow for the difference between the mean temperature of the fluid, which changes along the pipe length, and that of the pipe. (a) For the prescribed values of k, D, w, h, and T and a pipe of length L 100 m, what is the outlet temperature Tm,o of water that enters the pipe at a temperature of Tm,i 90 C and a flow rate of ? (b) What is the pressure drop of the water and the corresponding pump power requirement? (c) Subject to the constraint that the width of the duct is fixed at w 0.30 m, explore the effects of the flow rate and the pipe diameter on the outlet temperature. m