dryness factor of steam

[rmenon]

Hi Guys,
Need help on a couple of issues.
a)A closed vessel of .8 m.3 capacity has dry saturated steam at 350 Kpa. The vessel is cooled to 200 kpa.
What is the dryness factor of steam and what is the mass of steam in the vessel.

b) In a Rankine cycle a system produces dry saturated steam at 500 kpa. The condenser pressure is 20 kpa. Calculate the dryness factor of steam at the turbine exhaust.

Thanks

[Robert Fogt]

I searched but could not find any information on Dryness Factor. I am not sure what is meant by that.

[Unregistered]

Must mean steam quality, which is the % vapor of H2O.
The total mass in the box is the density of saturated 350 kPa steam x volume.
The mass of steam is density of saturated 200 kPa steam x volume. The volume of the condensed water can be ignored.
Divide the 2nd number by the 1st to get steam quality.