How to Identify the Phase of Steam Using a Thermodynamics Table?

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SUMMARY

The discussion focuses on identifying the phase of steam using the A-4 Thermodynamics Table, specifically at a temperature of 110°C and a pressure of 55.732 kPa. The saturated pressure for water at this temperature is 143.38 kPa, indicating that the steam is in a superheated state due to the lower pressure. The conversation also clarifies that at the same temperature with a pressure of 143.38 kPa, the steam could be either saturated liquid, saturated vapor, or a saturated mixture, requiring additional data for accurate determination.

PREREQUISITES
  • Understanding of thermodynamic phase changes
  • Familiarity with the A-4 Thermodynamics Table
  • Knowledge of saturated and superheated steam properties
  • Basic concepts of pressure and temperature relationships in thermodynamics
NEXT STEPS
  • Study the A-4 Thermodynamics Table in detail
  • Learn about superheated vapor and supercritical vapor distinctions
  • Research methods for determining phase states using macroscopic density
  • Explore the implications of pressure and temperature on steam phases
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Students and professionals in thermodynamics, mechanical engineers, and anyone involved in steam system analysis or energy systems design.

dhkdeoen
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Homework Statement

[/B]
Determine the phase of the steam (compress liquid, saturated liquid, saturation mixture, saturated vapor, superheated vapor, or supercritical vapor). Use A-4 Table.

T=110 Celsius
P=55.732 kPa

Homework Equations


A-4 Table: http://che31.weebly.com/uploads/3/7/4/3/3743741/handout_g1-saturatedwater-temperature.pdf

The Attempt at a Solution


[/B]
From A-4 Table, Saturated Water at 110 Celsius got 143.38 kPa. For the problem it has same temperature, but lower pressure. So it means it's superheated vapor, right?

what I want to know is, how am I supposed to tell it's whether saturated water, saturated mixture or saturated vapor. or even supercritical vapor.

Like, if the problem was to determine phase at T=110 Celsius and P=143.38kPa, should it be saturated liquid or saturated mixture?
 
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dhkdeoen said:

Homework Statement

[/B]
Determine the phase of the steam (compress liquid, saturated liquid, saturation mixture, saturated vapor, superheated vapor, or supercritical vapor). Use A-4 Table.

T=110 Celsius
P=55.732 kPa

Homework Equations


A-4 Table: http://che31.weebly.com/uploads/3/7/4/3/3743741/handout_g1-saturatedwater-temperature.pdf

The Attempt at a Solution


[/B]
From A-4 Table, Saturated Water at 110 Celsius got 143.38 kPa. For the problem it has same temperature, but lower pressure. So it means it's superheated vapor, right?
Right.
what I want to know is, how am I supposed to tell it's whether saturated water, saturated mixture or saturated vapor. or even supercritical vapor.
Well, in this problem, the only choices are superheated vapor or supercritical vapor. You know it's not supercritical vapor, because the temperature is not above the critical temperature.
Like, if the problem was to determine phase at T=110 Celsius and P=143.38kPa, should it be saturated liquid or saturated mixture?
From the information provided, it can be either saturated liquid, saturated vapor, or a saturated mixture. To resolve this, you would need more information, like the macroscopic density of the mixture.

Chet
 

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