Steam at 3 MPa and 400°C is expanded to 30 kPa in an adiabatic turbine with an isentropic efficiency of 92 percent. Determine the power produced by this turbine, in kW, when the mass flow rate is 2 kg/s.

Steam enters an adiabatic turbine at 5 MPa and 500°C with a 50 m/s velocity and exits from the turbine at 100 kPa and 75 m/s velocity. The power output of the turbine is 5 MW and the isentropic efficiency is 80%. Determine, a) The mass flow rate of the steam passed through the turbine. b) The temperature at the turbine exit. c) The rate of entropy generation during this process.

Check image attached1

A steady-flow compressor has R-134a entering at 120 kPa as a saturated vapor and exits at 800 kPa and 50°C, requiring 55 kJ/kg of work. Assume that the boundary of the compressor is at 30°C. What is the specific enthalpy of the R-134a at the inlet, in kJ/kg? What is the specific enthalpy of the R-134a at the outlet, in kJ/kg? How much heat transfer, in kJ/kg, exits the system?