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Temperature-Entropy (T-s) Diagram
Enthalpy-Entropy (h-s) or Mollier Diagram - h1012v1_74

Thermodynamics Heat Transfer and Fluid Flow Volume 1 of 3
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Thermodynamics PROPERTY DIAGRAMS AND STEAM TABLES where: 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 - sf Enthalpy-Entropy (h-s) or Mollier Diagram The  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  entirely different 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 of constant superheat lines.  The Mollier diagram is used only when quality is greater than 50% and for superheated steam. Steam Tables Steam 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 Figure A-2 of Appendix A.  Both sets of tables are tabulations of pressure (P), temperature (T), specific volume  (n),  specific  enthalpy  (h),  and  specific  entropy  (s).   The  following  notation  is  used  in steam  tables.   Some  tables  use  v  for  n  (specific  volume)  because  there  is  little  possibility  of confusing 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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