To maintain pump power requirements per unit flow
Chapter 8, Problem 8.64(choose chapter or problem)
To maintain pump power requirements per unit flow ratebelow an acceptable level, operation of the oil pipeline of 8.63 is subject to the constraint that the oil exittemperature Tm,oexceed 110C. For the values of Tm,i, Ts,D, ti, z, L, and kiprescribed in 8.63, operatingparameters that are variable and affect Tm,oare the ther-mal conductivity of the soil and the flow rate of the oil.Depending on soil composition and moisture and thedemand for oil, representative variations are 0.25?ks?1.0 W/m?K and 250?m?o?500 kg/s. Using the proper-ties prescribed in 8.63, determine the effect ofthe foregoing variations on Tm,oand the total heat rate q.What is the worst case operating condition? If necessary,what adjustments could be made to ensure that Tm,o?110C for the worst case conditions?
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