The rate at which heat is added in the boiler, the power produced to operate the pumps, the net power produced by the cycle and the thermal efficiency of the cycle.
Explanation of Solution
Given:
Pressure of water at the condenser
Pressure of water at the boiler
Temperature of water at the turbine inlet
Mass flow rate of water
Temperature of water leaving the condenser
Isentropic efficiency of the turbine
Calculation:
Draw the
The pressures are constant for the process 2 to 3 and process 4 to 1.
The entropies are constant for the process 1 to 2 and process 3 to 4.
Refer Table A-5, “Saturated water-Pressure table”, obtain the saturation temperature corresponding to the pressure of
Calculate the temperature at state 1
Refer Table A-4, “Saturated water-Temperature table”, obtain the enthalpy and specific volume at state 1 corresponding to the temperature of
Refer Table A-5, “Saturated water-Pressure table”, obtain the following properties corresponding to the pressure of
Calculate the work done by the pump during process 1-2
Calculate the enthalpy at state 2
Refer Table A-6, “Superheated water”, obtain the enthalpy and entropy at state 3 corresponding to the pressure of
Calculate the quality of water at state 4s
Calculate the enthalpy at state 4s
Calculate the enthalpy at state 4
Calculate the rate at which heat is added in the boiler
Thus, the rate at which heat is added in the boiler is
Calculate the work produced by the turbine
Calculate the power produced to operate the pumps
Thus, the power produced to operate the pumps is
Calculate the net power produced by the cycle
Thus, the net power produced by the cycle is
Calculate the thermal efficiency of the cycle
Thus, the thermal efficiency of the cycle is
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Chapter 9 Solutions
Fundamentals of Thermal-Fluid Sciences
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