Wet steam at 15 bar is throttled adiabatically in a steady-flow process to 2 bar. The resulting stream has a temperature of 130°C. What are the temperature and quality of the wet steam? Calculate the change of entropy of the steam as a result of the process. It is important to note that a throttling process is where the change of enthalpy is zero (that is, AH = 0). Temperature ~ 198 °C and the quality of 96.76%. AS = 0.8708 kJ/kg-K

Explanation:

The adiabatic throttling process is modelled after the First Law of Thermodynamics:

Properties of water at inlet and outlet are obtained from steam tables:

State 1 - Inlet (Liquid-Vapor Mixture)

State 2 - Outlet (Superheated Vapor)

The change of entropy of the steam is derived of the Second Law of Thermodynamics:

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explanation:

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