A heat exchanger, operating at steady state, is used to heat an ideal gas. The ideal gas has a constant CP*=5R, molecular weight of 100 g/mol, flowrate of 1000 mol/min, enters at T=100 °C and P=1.1 bar, and leaves at T=190 °C and P=1 bar.
The heat is provided by steam that enters the heat exchanger’s shell side as 50 kg/min of saturated steam at 200 °C. Steam temperature and pressure remain constant in the shell side but a small portion of the steam condenses as heat is transferred to the ideal gas.
There are no moving parts in either side of the heat exchanger.
A) Determine the quality (vapor fraction) of the exiting liquid-vapor water mixture.
B) Determine the rate at which entropy is generated in this heat exchanger. (If you have no answer to part A, assume the quality is 0.97).
A) Apply steady state energy balance around heat exchanger:
B) Apply steady state entropy balance around heat exchanger:
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