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Given the following for a simple, cocurrent exchanger: tube outside diameter, D0=0.75 inches tube inside diameter, Di=0.62 inches inside heat transfer coefficient, hi =340btu/ft2hrF outside

Given the following for a simple, cocurrent exchanger: tube outside diameter, D0=0.75 inches tube inside diameter, Di=0.62 inches inside heat transfer coefficient, hi =340btu/ft2hrF outside heat transfer coefficient, ho =711btu/ft2hrF outside fouling factor, hfo =579btu/ft2hrF tube wall thermal conductivity, 26=btu/hrftF What is the tube wall log mean diameter, Dlm in inches? What is the overall heat transfer coefficient, Uo in btu/ft2-hr-F

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