Find entropy where the temperature is lower than the saturated temperature

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To find the entropy and enthalpy at a pressure of 100 bar and a temperature of 260°C, the dryness fraction (x) must be determined, but there are two unknowns in the equations. The availability equation requires values for enthalpy (h) and entropy (s), which depend on the saturation properties at the given pressure. The saturation temperature at 100 bar is 311°C, indicating that the system is subcooled. To compute the necessary values for s and h, using the ASME steam tables is recommended for accurate results. Understanding these properties is essential for calculating availability in thermodynamic systems.
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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?
 
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