1. A test is conducted to determine the overall heat transfer coefficient in a shell-and-tube oil-to-water heat exchanger that has 24 tubes of internal diameter 1.2 cm and length 2 m in a single shell. Cold water (cp = 4180 J/kg.K) enters the tubes at 20 °C at a rate of 3 kg/s and leaves at 55 °C. Oil (cp = 2150 J/kg.K) flows through the shell and is cooled from 120 °C to 45 °C. Determine the overall heat transfer coefficient Ui of this heat exchanger based on the inner surface area of the tubes.

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  2. A 5-m long simply supported timber beam carries a uniformly distributed load of 12 kN/m, as shown in Figure P9.11a. The cross-sectional dimensions of the beam are shown in Figure P9.11b. (a) At section a-a, determine the magnitude of the shear stress in the beam at point H. (b) At section a-a, determine the magnitude of the shear stress in the beam at point K. (c) Determine the maximum horizontal shear stress that occurs in the beam at any location within the 5-m span length. (d) Determine the maximum compression bending stress that occurs in the beam at any location within the 5-m span length

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  3. MathJax Example