Find entropy where the temperature is lower than the saturated temperature

[civic_67]

my starting of system is 100 bar and 260 degree C. the saturation temperature for 100 bar is 311 degree C. so in order to find my enthalpy and entropy, i need to find x, dryness fraction. but my equation have 2 unknowns. how do I calculate availability?

availability = (h-h0) -T0(s-s0)

s = sf + xsfg

have 2 unknowns. how do i compute s and h in order to compute availability?

 

[jim hardy]

ASME or Keenan & Keyes Steam tables?

 

[civic_67]

ASME steam tables