Consider an isentropic steam turbine shown in Figure 2. Steam at 6 MPa and 400℃ is supplied to the throttle inlet, and the turbine exhaust pressure is set at 70 kPa. Analyse this isentropic steam turbine and answer the following questions. (a) How much work is being produced by the isentropic steam turbine in Figure 2, in kJ/kg? (b) Consider the case where the throttle valve is closed to a point where the inlet pressure is halved. Compare the work produced under this condition with the work produced in (a). (c) Now let us remove the throttle valve, and, instead of steam, let air expand in the turbine from an inlet state of 2200 kPa and 300℃ to an outlet pressure of 200 kPa. If the turbine is now an adiabatic turbine of 90% isentropic efficiency, how much work is being produced by the turbine in contrast to the previous one in (b)?
Consider an isentropic steam turbine shown in Figure 2. Steam at 6 MPa
and 400℃ is supplied to the throttle inlet, and the turbine exhaust pressure
is set at 70 kPa. Analyse this isentropic steam turbine and answer the
following questions.
(a) How much work is being produced by the isentropic steam turbine in
Figure 2, in kJ/kg?
(b) Consider the case where the throttle valve is closed to a point where the
inlet pressure is halved. Compare the work produced under this condition
with the work produced in (a).
(c) Now let us remove the throttle valve, and, instead of steam, let air
expand in the turbine from an inlet state of 2200 kPa and 300℃ to an outlet
pressure of 200 kPa. If the turbine is now an adiabatic turbine of 90%
isentropic efficiency, how much work is being produced by the turbine in
contrast to the previous one in (b)?
(d) How much entropy is generated by this new setup in (c)?
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