Thermodynamics PROPERTY DIAGRAMS AND STEAM TABLESPROPERTY DIAGRAMS AND STEAM TABLESProperty diagrams and steam tables are used in studying the theoretical andactual properties and efficiencies of a given system.EO 1.16 Given a Mollier diagram and sufficient information toindicate the state of the fluid, DETERMINE anyunknown properties for the fluid.EO 1.17 Given a set of steam tables and sufficient informationto indicate the state of the fluid, DETERMINE anyunknown properties for the fluid.EO 1.18 DETERMINE the change in the enthalpy of a fluid asit passes through a system component, given the stateof the fluid at the inlet and outlet of the componentand either steam tables or a Mollier diagram.PropertyDiagramsThe phases of a substance and the relationships between its properties are most commonly shownon property diagrams. A large number of different properties have been defined, and there aresome dependencies between properties. For example, at standard atmospheric pressure andtemperature above 212°F, water exists as steam and not a liquid; it exists as a liquid attemperatures between 32°F and 212°F; and, it exists as ice at temperatures below 32°F. Inaddition, the properties of ice, water, and steam are related. Saturated steam at 212°F andstandard atmospheric pressure has a specific volume of 26.8 ft3/lbm. At any other temperatureand pressure, saturated steam has a different specific volume. For example, at 544°F and 1000psia pressure, its specific volume is 0.488 ft3/lbm.There are five basic properties of a substance that are usually shown on property diagrams.These are: pressure (P), temperature (T), specific volume (n), specific enthalpy (h), and specificentropy (s). When a mixture of two phases, such as water and steam, is involved, a sixthproperty, quality (x), is also used.There are six different types of commonly encountered property diagrams. These are: Pressure-Temperature (P-T) diagrams, Pressure-Specific Volume (P-n) diagrams, Pressure-Enthalpy (P-h)diagrams, Enthalpy-Temperature (h-T) diagrams, Temperature-entropy (T-s) diagrams, andEnthalpy-Entropy (h-s) or Mollier diagrams.Rev. 0 Page 41 HT-01
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