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Enthalpy-Entropy (h-s) or Mollier Diagram - h1012v1_74
Use of steam tables

Thermodynamics Heat Transfer and Fluid Flow Volume 1 of 3
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Thermodynamics PROPERTY DIAGRAMS AND STEAM TABLES n xng (1 x)nf x n n f n fg h xhg (1 x)hf x h hf hfg s xsg (1 x)sf x s sf sfg In  order  to  solve  problems  in  Thermodynamics,  information  concerning  the  "state"  of  the substance studied must be obtained.   Usually, two properties (for example, v, p, T, h, s) of the substance  must  be  known  in  order  to  determine  the  other  needed  properties.    These  other properties are usually obtained utilizing either the Mollier diagram (if the substance is steam) or the saturated and superheated steam tables, as shown in the Figures A-1 and A-2. The following two examples illustrate the use of the Mollier diagram and the steam tables. Example 1:   Use of Mollier Chart. Superheated  steam  at  700  psia  and  680°F  is  expanded  at  constant  entropy  to 140  psia. What is the change in enthalpy? Solution: Use the Mollier Chart.   Locate point 1 at the intersection of the 700 psia and the 680°F line.   Read h = 1333 Btu/lbm. Follow  the  entropy  line  downward  vertically  to  the  140  psia  line  and  read  h  =  1178 Btu/lbm. h = 1178 - 1333 = -155 Btu/lbm D Rev. 0 Page 49 HT-01







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