H.W Example 3 Steam enters an adiabatic turbine at 450°C and 20 MPa with the mass flow rate of 0.5 kg/s and leaves at 10 kPa and 85% quality. Assume changes in kinetic and potential are negligible, determine the work produces by the turbine. Steam P₁ = 20 MPa 450 T₁ = 350°C m= 0.5 kg/s Turbine 9=0 P₂ = 10 kPa X2= 0.85 Control Volume: Turbine Assumptions: SSSF Process 9cv = 0, AKE =0,APE = 0, CV Solution: apply 1st law SSSF Proc. q+h+V+zg=w+ h; + ½ V² +zeg i h₁ =w+h₂ → w = h₁- h₂ and steam table 2 state 2 → mixture, h = h₂+x₂hfg

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If you had an uninsulated air compressor which required Win = 400 kW to take air from a state at 80 kPa and 20 °C and change it to a state at 800 kPa and 200 °C, what would the Q be? Assume the air enters via a 10 cm diameter pipe at 20 m/s. (a) -171 kW (b)-198 kW (c) -233 kW (d) -263 kW