Steam enters a turbine at 120 bars and 440 0C and expands to 1 bar. At the exit entropy is 0.650 kJ/kg. K, greater than at the inlet. The process is adiabatic and change in kinetic and potential energies may be neglected.
Determine the work done by the steam, in kJ/kg and Now, for the same initial conditions and the same final pressure the turbine is run without insulation. It is found that the entropy increase of the steam is now 0.600 kJ/kg. K, and that the heat transfer from the steam occurs to the environment, which is at 300 K. the entropy change the environment is 0.0850 kJ/K per kg of the steam. Determine the heat transfer and the work output for the steam turbine under this new conditions, in kJ/kg