What is meant by the dryness fraction (or quality) of steam and explain how the

Question

What is meant by the dryness fraction (or quality) of steam and explain how the enthalpy of wet steam at a given pressure can be determined? 0.05 kg of steam at 15 bar is contained in a rigid vessel of volume 0.0076 m^3. What is the temperature of the steam? If the vessel is cooled, at what temperature will the steam be just dry saturated? Cooling is continued until the pressure in the vessel is 11 bar; Calculate the final dryness fraction of the steam. Calculate the heat rejected between the initial and final states.

Explanation / Answer

The steam dryness fraction is used to quantify the amount of water within steam. If steam contains 10% water by mass, it's said to be 90% dry, or have a dryness fraction of 0.9.

Specific Enthalpy

Specific enthalpy is a property of the fluid and can be expressed as:

h = u + p v      (2)

where

u = internal energy (kJ/kg)

p = absolute pressure (N/m2)

v = specific volume (m3/kg)

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