A proposed steam turbine is shown in the figure below. It is planned to bleed off 3 kg/s steam at the feedwater heater with operating conditions at 500 kPa and 225^oC (at the feedwater heater inlet). Heat is being rejected at the ambient (20^oC), amounting to 75 kJ/kg.

(a) How much power can be extracted from the steam turbine, in kW?
(b) What is the rate of change of entropy inside the control volume? That is, dScv/dt.
(c) Calculate the net rate of change in entropy due to the mass fluxes that enter and exit the turbine.
(d) What is the rate of entropy generation in the process? Is the proposed steam turbine implementable?
(e) If the inlet pressure is changed to 1.5 MPa, will the system be implementable? 

Transcribed Image Text:

P;= 5000 kPa, T; = 500°C 10 kg/s To feedwater heater Turbine exhaust 200 kPa, saturated vapor P;= 5000 kPa, T; = 500°C 10 kg/s To feedwater heater Turbine exhaust 200 kPa, saturated vapor

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