A New Phase Diagram: The T-S Diagram

The

TS Diagram

:
  • We only consider pure substances
  • Two-phase envelope, similar to PV Diagram
  • Subcooled

    or

    compressed liquids

    have lower entropy than saturated liquids
  • Superheated vapors

    have higher entropy than

    saturated vapors

  • The entropy of a

    saturated vapor-liquid mixture

    lies below the entropy of the saturated vapor (at the same T & P) and above the entropy of the saturated liquid at the same T & P.
Compressed or
Subcooled Liquid:
Equation
Superheated Vapor:
Equation
Saturated
Vapor -Liquid Mixture:
Equation
TS diagram showing the two-phase envelope, the subcooled liquid, two-phase and superheated vapor regions.
Subcooled Liquid
Superheated Vapor
Saturated Vapor - Liquid Mixture
Critical
Point
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Ch 7, Lesson B, Page 8 - A New Phase Diagram: The T-S Diagram