Question

13)  A turbine, operating under steady-flow conditions, receives 5000 kg of steam per hour. The steam enters the turbine at a velocity of 3000 m/min, an elevation of 5 m and a specific enthalpy of 2787 kJ/kg. It leaves the turbine at a velocity of 6000 m/min, an elevation of 1 m and a specific enthalpy of 2259 kJ/kg. Heat losses from the turbine to the surroundings amount to 16736 kJ/h. Determine the power output of the turbine.

14) 12 kg of a fluid per minute goes through a reversible steady flow process. The properties of fluid at the inlet are P1 = 1.4 bar, ρ1 = 25 kg/m3, V1 = 120 m/s and u1 = 920 kJ/kg and at the exit are P2 = 5.6 bar, ρ2 = 5 kg/m3, V2 = 180 m/s and u2 = 720 kJ/kg. During the passage, the fluid rejects 60 kJ/s and rises through 60 metres. Determine : (i) the change in enthalpy (Δh) and (ii) work done during the process (W).

Answer 1