a)
The thermal efficiency of the cycle.
a)
Explanation of Solution
Given:
Maximum pressure in the cycle
Minimum pressure in the cycle
Pressure at which steam is reheated for the first time
Pressure at which steam is reheated for the second time
Net power output of the cycle
Temperature of steam at all three stages of the turbine
Calculation:
Draw the
The pressures are constant for the process 4 to 5, process 6 to 7 and process 8 to 1.
The entropies are constant for the process 3 to 4, process 5 to 6 and process 7 to 8.
Refer Table A-5, “Saturated water-Pressure table”, obtain the specific enthalpy and specific volume at state 1 corresponding to the pressure of
Calculate the work done by the pump during process 1-2
Calculate the specific enthalpy at state 2
Refer Table A-6, “Superheated water”, obtain the specific enthalpy and specific entropy at state 3 corresponding to the pressure of
Refer Table A-6, “Superheated water”, obtain the specific enthalpy at state 4 corresponding to the pressure of
Refer Table A-6, “Superheated water”, obtain the specific enthalpy and specific entropy at state 5 corresponding to the pressure of
Refer Table A-6, “Superheated water”, obtain the specific enthalpy at state 6 corresponding to the pressure of
Refer Table A-6, “Superheated water”, obtain the specific enthalpy and specific entropy at state 7 corresponding to the pressure of
Refer Table A-5, “Saturated water-Pressure table”, obtain the following properties corresponding to the pressure of
Calculate the quality of steam at state 8
Calculate the specific enthalpy at state 8
Calculate the thermal efficiency of the cycle
Thus, the thermal efficiency of the cycle is
b)
The mass flow rate of the steam.
b)
Explanation of Solution
Calculate the mass flow rate of the steam
Thus, the mass flow rate of the steam is
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Chapter 9 Solutions
Fundamentals of Thermal-Fluid Sciences
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