This document discusses different types of thermodynamic diagrams used to analyze thermodynamic processes and systems. It describes P-h, T-s, and H-T diagrams. A P-h diagram shows pressure vs enthalpy and can be used for any pure substance. It has liquid-vapor regions where two phases coexist. A T-s diagram, which is frequently used to analyze energy transfer systems, shows temperature vs entropy. It also has a liquid-vapor region where two phases coexist and the heat of a process equals the area under the T-s curve. Both P-h and T-s diagrams exhibit similar features and can be constructed for any pure substance.

2.  P-H DIAGRAM
 T-S DIAGRAM
 H-T DIAGRAM
 H-S DIAGRAM

4.  A P-h diagram exhibits the same Figure 1 P-h Diagram for
Water features as a P-n diagram. Figure 1 is the P-
h diagram for pure water. A P-h diagram can be
constructed for any pure substance.
 Like the P-n diagram, there are regions on a P-h diagram
in which two phases exist together.
 In the liquid-
vapor region in water and steam exist together.
 For example, at point A, waterwith an enthalpy (hf
), given by point B, exists together with steam
with an enthalpy (hg), given by point C.
 The quality of the mixture at any point in the
liquid-vapor region can be found using the following
relationship.

6.  Thermodynamics Temperature-Entropy (T-s)
DiagramA Ts diagram is the type of diagram most frequently
used to analyze energy transfer system cycles.
 This is because the work done by or on the system and the heat
added to or removed from the system can be visualized on the T-s
diagram.
 By the definition of entropy, the heat transferred to or from a
system equals the area under the T-s curve of the process.
 Figure 2 is the T-s diagram for pure water. A T-s diagram can be
constructed for any pure substance

7.  PROPERTY DIAGRAMS AND STEAM TABLES Thermodynamics
Temperature-Entropy (T-s) Diagram A T-
s diagram is the type of diagram most frequently used to an
alyze energy transfer system cycles.
 This is because the work done by or on the system and the heat
added to or removed from the system can be visualized on the T-s
diagram.
 By the definition of entropy, the heat transferred to or from a
system equals the area under the T-s curve of the process.


8.  Figure 2 is the T-s diagram for pure water. A T-s diagram
can be constructed for any pure substance.
 It exhibits the same features as P-u diagrams. Figure 2 T-
s Diagram for Water In the liquid-vapor region in Figure 2,
water and steam exist together.
 For example, at point A, water with an entropy (sf) given
by point B, exists together with steam with an entropy (sg)
given by point C.
 The quality of the mixture at any point in the liquid-vapor
region can be found using the following relationship

9.  A TEXTBOOK OF CHEMICAL ENGINEERING
THERMODYNAMICS BY K.V.NARAYANAN