Question

Question B3 (25 Marks Write down a mathematical expression for the First Law of Thermodynamics as applied to steady state, steady flow process, explaining clearly the notation and sign conventions used. (5 marks) Consider steady state, steady flow of steam through a turbine used for electricity generation. You may assume that the process is adiabatic. The steam inlet and exit conditions are; Inlet Exit 15.0 0.01 Pressure (MPa) TemperatureC Velocity (m/s 500 40 80 Fraction 0.92 P, 15.0 MPa T,-500C 40 m/s W 80.OMW Turbine Power out x, = 0.92 Making use of the Data Tables given at the end of this paper, determine; (5 marks) (5 marks) (5 marks) (i) The outlet temperature of the steam (°C), (ii) The change in specific enthalpy of the steam (kJ.kg) (ii) The change in steam kinetic energy per unit mass (kJ.kg), and (iv) The mass flow rate of steam required to yield a turbine mechanical power output of 80.0 MW (Neglecting any mechanical friction losses in the turbine). 5 marks) o0o

Answer 1

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