The error caused in the thermal efficiency.
Explanation of Solution
Given:
Pressure of steam at the condenser
Pressure of steam at the turbine
Temperature of steam at the turbine
Net power produced by the cycle
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-5E, “Saturated water-Pressure table”, obtain the enthalpy and specific volume at state 1 corresponding to the pressure of
Refer Table A-5E, “Saturated water-Pressure table”, obtain the following properties at state 1 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-6E, “Superheated water”, obtain the enthalpy and entropy at state 3 corresponding to the pressure of
Calculate the quality of water at state 4
Calculate the enthalpy at state 4s
Calculate the enthalpy at state 4
Calculate the heat supplied in the boiler
Calculate the mass flow rate of steam
Calculate the mass flow rate of steam
Calculate the rate of heat addition
Calculate the rate of heat addition
Thus, the rate of heat supply in the boiler is
Calculate the thermal efficiency of the cycle
Calculate the thermal efficiency of the cycle
Calculate the error caused in the thermal efficiency
Thus, the error caused in the thermal efficiency is
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Chapter 9 Solutions
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