Question

7-210 in 7th edition thermodynamics:an engineering approach

to control the output of an isentropic steam turbine a throttle valve is placed in the steam line supplying the turbine inlet. steam at 6 MPa and 400 celsius issupplied to the throttle inlet, and the turbine exhaust pressure is set at 70 kPa. Compare the work produced by this steam turbine, in kJ/kg, when a) the throttlevalve is completely open (there is no pressure loss) and b) when the throttle valve is partially closed so that the pressure at the turbine inlet is 3 MPa.

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