Helium at 800kPa, 600C enters a steady flow turbine and leaves at 100kPa. The helium undergoes an expansion process through the turbine, does work in the amount of 900kj/kg, and loses 50kj/kg of energy by heat transfer to the surroundings.
a) Determine the exit temperature of the helium in C
b) If the surroundings have a temperature of 25C what is the total entropy change for this process?
c) Is this process possible?