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.
5.
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
