Lesson 6
PROPERTY DIAGRAMS AND STEAM TABLES
• DETERMINE any unknown properties for a fluid given a Mollier
diagram and sufficient information to indicate the state of the fluid.
• DETERMINE any unknown properties for a fluid, given a set of
steam tables and sufficient information to indicate the state of the
fluid.
• DETERMINE the change in the enthalpy of a fluid as it passes
through a system component, given the state of the fluid at the
inlet and outlet of the component and either steam tables or a
Mollier diagram.
Property Diagrams
• Pressure- Temperature (P-T) diagrams
• Pressure-Specific Volume (P-v) diagrams
• Pressure-Enthalpy (P-h) diagrams
• Enthalpy-Temperature (h-T) diagrams
• Temperature-Entropy (T-s) diagrams
• Enthalpy-Entropy (h-s) or Mollier diagrams.
Pressure- Temperature (P-T) diagram
Pressure-Specific Volume (P-v) Diagram
Pressure-Enthalpy (P-h) Diagram
Enthalpy-Temperature (h-T) Diagram
Temperature-Entropy (T-s) Diagram
Enthalpy-Entropy (h-s) or Mollier Diagram
Steam Tables
• Saturated steam tables
• Superheated steam tables
• Both sets of tables are tabulations of pressure
(P), temperature (T), specific volume (v),
specific enthalpy (h), and specific entropy (s)
Saturated Steam Tables
• Provide energy transfer properties of saturated
water and saturated steam for temperatures from
32 to 705.47°F (the critical temperature) and for
the corresponding pressure from 0.08849 to
3208.2 psi.
• Divided into two parts:
– Temperature Tables – Lists properties according to
saturation temperature (Tsat)
– Pressure Tables - Lists properties according to
saturation pressure (Psat).
Property Diagrams and Steam Tables Summary
• The Mollier diagram can be used to determine
various properties of a fluid.
– Mollier diagram is an h versus s plot.
– Can only be used when quality is greater than 50%
and for superheated steam.
– Contains a series of constant temperature,
constant pressure, constant moisture content, and
constant superheat lines.
Property Diagrams and Steam Tables Summary
(continued)
The steam tables can be used to determine various properties of
water using the following equations.
Property Diagrams and Steam Tables Summary
(continued)
The change in enthalpy of a fluid as it passes
through a component can be determined
using a Mollier diagram on steam tables.