Question

# (30 pts) A two-pass shell-and-tube heat exchanger cools moil = 8 kg/s of engine oil from 70 °C to35 °C. The engine oil flows through the tubes. Oil specific heat

is Cpoil = 1990 J/kg-K. The oil-side convection coefficient is h; = 200 W/m²-K. Cooling water is taken from a nearby river at 15 °C. Environmental regulations allow a maximum7°C increase in outlet water temperature. Water specific heat is Cpw = 4180 J/kg-K. The water-side convection coefficient is ho = 3400 W/m2-K. The heat exchanger tubes are made of Inconel: D; = 0.017 m, Do = 0.02 m, k = 11.7 W/m-K.The tube length per pass is Lp = 2.4 m. Calculate the heat transfer rate between the fluid streams, Q Calculate the required water mass flow rate, mw Calculate the uncorrected log mean temperature difference (LMTD), ATım, uncorr Determine the correction factor, F, and calculate the corrected LMTD, ATIM Calculate the overall heat transfer coefficient, U Calculate the heat transfer area, A, and the required number of tubes, NT

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