Steam is the working fluid in a Rankine cycle as shown in Fig. Q1 with superheat and reheat. Steam enters the first-stage turbine at 8.0 MPa (80 bar), 480 °C, and expands to 0.7 MPa (7 bar). It is then reheated to 440 °C before entering the second-stage turbine, where it expands to the condenser pressure of 0.008 MPa. Each turbine stage has the same isentropic efficiency of 85%. If the net power output is 100 MW:

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Q1.
Steam is the working fluid in a Rankine cycle as shown in Fig. Q1 with superheat and reheat.
Steam enters the first-stage turbine at 8.0 MPa (80 bar), 480 °C, and expands to 0.7 MPa (7 bar).
It is then reheated to 440 °C before entering the second-stage turbine, where it expands to the
condenser pressure of 0.008 MPa. Each turbine stage has the same isentropic efficiency of 85%.
If the net power output is 100 MW:
(a) Draw the T-s diagram of the reheat Rankine cycle and number the states.
(b) Calculate the cycle thermal efficiency.
(c) Calculate the mass flow rate of steam, in kg/h.
(d) Calculate the boiler heat input in MW.
(e) Calculate the condenser heat output in MW.
Steam
generator
S
Pump
Fig. Q1
-Turbine 1
-Turbine 2
IL Ⓒ
(Condenser)
Transcribed Image Text:Q1. Steam is the working fluid in a Rankine cycle as shown in Fig. Q1 with superheat and reheat. Steam enters the first-stage turbine at 8.0 MPa (80 bar), 480 °C, and expands to 0.7 MPa (7 bar). It is then reheated to 440 °C before entering the second-stage turbine, where it expands to the condenser pressure of 0.008 MPa. Each turbine stage has the same isentropic efficiency of 85%. If the net power output is 100 MW: (a) Draw the T-s diagram of the reheat Rankine cycle and number the states. (b) Calculate the cycle thermal efficiency. (c) Calculate the mass flow rate of steam, in kg/h. (d) Calculate the boiler heat input in MW. (e) Calculate the condenser heat output in MW. Steam generator S Pump Fig. Q1 -Turbine 1 -Turbine 2 IL Ⓒ (Condenser)
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