The rate of entropy generation during the process.
Explanation of Solution
Given:
The inlet pressure of the water
The inlet temperature of the water
The mass flow rate of water
The inlet pressure of the steam
The inlet temperature of the steam
The heat lost to the surroundings
The surrounding temperature of the air
Calculation:
Refer to Table A-4E, “Saturated water—Temperature table”, obtain the below properties at the pressure of
The fluid entropy
The fluid enthalpy
Refer to Table A-4E, “Saturated water—Temperature table”, obtain the below properties at the pressure of
The entropy at inlet 2
The enthalpy at inlet 2
Refer to Table A-4E, “Saturated water—Temperature table”, obtain the below properties at the pressure of
The entropy at exit 3
The enthalpy at exit 3
Write the expression for the energy balance equation for closed system.
Here, rate of net energy transfer in to the control volume is
Substitute 0 for
Here, mass flow rate at inlet 1 is
Substitute
The rate of change in internal energy of the system is zero at steady state,
Write the expression for the mass balance of the system.
Here, inlet mass flow rate is
Substitute
Write the expression for the entropy balance during the process.
Here, rate of net input entropy is
Substitute
Thus, the rate of entropy generation during the process is
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Chapter 8 Solutions
Fundamentals of Thermal-Fluid Sciences
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