Thermodynamics PROPERTY DIAGRAMS AND STEAM TABLESwhere:s = specific entropy of the mixture (Btu/lbm-°R)x = quality of the mixture (no units)sg= specific entropy of the saturated vapor (Btu/lbm-°R)sf= specific entropy of the saturated liquid(Btu/lbm-°R)sfg= specific entropy change of vaporization (Btu/lbm-°R) or sfg = sg - sfEnthalpy-Entropy(h-s)orMollierDiagramThe Mollier diagram, shown in Figure A-1 of Appendix A, is a chart on which enthalpy (h)versus entropy (s) is plotted. It is sometimes known as the h-s diagram and has an entirelydifferent shape from the T-s diagrams. The chart contains a series of constant temperature lines,a series of constant pressure lines, a series of constant moisture or quality lines, and a series ofconstant superheat lines. The Mollier diagram is used only when quality is greater than 50% andfor superheated steam.SteamTablesSteam tables consist of two sets of tables of the energy transfer properties of water and steam:saturated steam tables and superheated steam tables. Portions of the tables are shown in FigureA-2 of Appendix A. Both sets of tables are tabulations of pressure (P), temperature (T), specificvolume (n), specific enthalpy (h), and specific entropy (s). The following notation is used insteam tables. Some tables use v for n (specific volume) because there is little possibility ofconfusing it with velocity.T = temperature (°F)P = pressure (psi)n= specific volume (ft3/lbm)nf= specific volume of saturated liquid (ft3/lbm)ng= specific volume of saturated vapor (ft3/lbm)Rev. 0 Page 47 HT-01
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