lesson 6 property diagrams and steam tables determine any unknown properties for a fluid given a...
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Lesson 6PROPERTY 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.
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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.
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Pressure- Temperature (P-T) diagram
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Pressure-Specific Volume (P-v) Diagram
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Pressure-Enthalpy (P-h) Diagram
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Enthalpy-Temperature (h-T) Diagram
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Temperature-Entropy (T-s) Diagram
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Enthalpy-Entropy (h-s) or Mollier Diagram
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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)
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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).
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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.
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Property Diagrams and Steam Tables Summary (continued)
The steam tables can be used to determine various properties of water using the following equations.
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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.