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An industrial application has the following steam requirement: one 10-kg/s stream at a pressure of 0.5 MPa and one 5-kg/s stream at 1.4 MPa (both saturated or slightly superheated vapor). It is obtained by cogeneration, whereby a high-pressure boiler supplies steam at 10 MPa, 500?C to a reversible turbine. The required amount is withdrawn at 1.4 MPa, and the remainder is expanded in the low-pressure end of the turbine to 0.5 MPa, providing the second required steam flow.
a. Determine the power output of the turbine and the heat transfer rate in the boiler.
b. Compute the rates needed if the steam is generated in a low-pressure boiler without cogeneration. Assume that for each, 20?C liquid water is pumped to the required pressure and fed to a boiler.
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