Find entropy where the temperature is lower than the saturated temperature

In summary, entropy is a measure of disorder or randomness in a system and has an inverse relationship with temperature. The saturated temperature is the point at which a substance transitions from liquid to gas, and entropy can be found at lower temperatures using specific heat capacity and the change in temperature. The amount of energy available and other factors such as molecular structure and external forces can affect entropy at lower temperatures.
  • #1
civic_67
2
0
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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  • #2
ASME or Keenan & Keyes Steam tables?
 
  • #3
ASME steam tables
 

1. What is entropy?

Entropy is a measure of the disorder or randomness in a system. It is a thermodynamic quantity that describes the distribution of energy within a system.

2. How is entropy related to temperature?

Entropy and temperature have an inverse relationship. As temperature increases, entropy also increases. This is because at higher temperatures, there is more thermal energy available to disperse and increase disorder within a system.

3. What is the saturated temperature?

The saturated temperature is the temperature at which a substance transitions from a liquid to a gas phase. It is also known as the boiling point. At this temperature, the vapor pressure of the substance is equal to the atmospheric pressure.

4. How do you find entropy when the temperature is lower than the saturated temperature?

To find entropy at a lower temperature, you need to know the specific heat capacity and the change in temperature. You can use the equation S = Q/T, where S is entropy, Q is heat, and T is temperature. However, this equation only applies to isothermal processes, where the temperature remains constant.

5. What factors affect the entropy of a system at a lower temperature than the saturated temperature?

The main factor that affects entropy at a lower temperature is the amount of energy available. At lower temperatures, there is less thermal energy to increase the disorder of the system. Other factors that may affect entropy include the molecular structure and composition of the system, as well as any external forces or constraints on the system.

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