
a)
The net power delivered to the generator by the turbine.
a)

Answer to Problem 194RP
The net power delivered to the generator by the turbine is 20,448 kW.
Explanation of Solution
Write the expression for the final entropy,
Here, final entropy is
Write the expression to calculate the final enthalpy
Here, final enthalpy is
Express the energy balance equation for closed system.
Here, energy transfer in to the system is
Write the energy balance for the compressor using equation (III).
Write the energy balance for the compressor using equation (III).
Write the expression for the net work done.
Conclusion:
From the Table A-1, “Molar mass, gas constant, and critical-point properties”, select the gas constant
Refer to Table A-17, “ideal gas properties of air”, obtain the following properties of air at a temperature of 295 K.
Refer to Table A-17, “ideal gas properties of air”, obtain the following properties of air at a temperature of 620 K.
From Table A-6E, “Superheated water”, select the enthalpy
Refer to Table A-3, “saturated water-pressure table”, obtain the following properties of water at pressure of 10 kPa.
Substitute
Substitute
Substitute
Substitute
Substitute
Thus, the net power delivered to the generator by the turbine is 20,448 kW.
b)
The rate of entropy generation with in the turbine and compressor during the process
b)

Answer to Problem 194RP
The rate of entropy generation with in the turbine and compressor during the process is
Explanation of Solution
Write the formula for the entropy change of compressor.
Here, pressure at state point 2 is
Write the formula for the entropy change of turbine.
Write the expression for the total entropy generation.
Conclusion:
Substitute
Substitute
Substitute
Thus, the rate of entropy generation with in the turbine and compressor during the process is
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Chapter 7 Solutions
EBK THERMODYNAMICS: AN ENGINEERING APPR
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