A gas-turbine power plant operates on a modified Brayton cycle shown in the figure with an overall pressure ratio of 8. Air enters the compressor at 0°C and 100 kPa. The maximum cycle temperature is 1500 K. The compressor and the turbines are isentropic. The high pressure turbine develops just enough power to run the compressor. Assume constant properties for air at 300 K with Cv = 0.718 kJ/kg•K, Cp = 1.005 kJ/kg•K, R= 0.287 kJ/kg•K, k = 1.4. (a) Sketch the T-s diagram for the cycle. Label the data states. (b) Determine the temperature and pressure at state 4, the exit of the high pressure turbine. (c) If the net power output is 200 MW, determine mass flow rate of the air into the compressor, in kg/s.

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A gas-turbine power plant operates on a modified Brayton cycle shown in the figure with an overall pressure ratio of 8. Air enters the compressor at 0°C and 100 kPa. The maximum cycle temperature is 1500 K. The compressor and the turbines are isentropic. The high pressure turbine develops just enough power to run the compressor. Assume constant properties for air at 300 K with Cv = 0.718 kJ/kg•K, Cp = 1.005 kJ/kg•K, R= 0.287 kJ/kg•K, k = 1.4. (a) Sketch the T-s diagram for the cycle. Label the data states. (b) Determine the temperature and pressure at state 4, the exit of the high pressure turbine. (c) If the net power output is 200 MW, determine mass flow rate of the air into the compressor, in kg/s.

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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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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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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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solved 0 8 months 1 Answer Reply 23 views

solid constant-diameter shaft is subjected to the torques shown in Figure. The bearings shown allow the shaft to turn freely. (a) Plot a torque diagram showing the internal torque in segments 1, 2 and 3 of the shaft. Use the sign convention. (b) If a solid 1.905 cm diameter shaft is subjected to that particular torque. Determine the maximum shear stress magnitude in the shaft. (c) If the allowable shear stress in the shaft is 80 MPa, determine the minimum acceptable diameter for the shaft.

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solved 0 9 months 1 Answer Reply 17 views