Use of Mollier Chart

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 xn_g (1 x)n_f x n n f n fg h xh_g (1 x)h_f x h h_f h_fg s xs_g (1 x)s_f x s s_f s_fg 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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