[ Themodynamics
Table of Contents ]
A T-s diagram is the type of diagram most
frequently used to analyze energy transfer systemcycles.
This is because the work done by or on the system and the
heat added to or removedfrom
the system can be visualized on the T-s diagram. By the
definition of entropy, the heattransferred
to or from a system equals the area under the T-s curve of
the process. Figure 13 is the T-s diagram for pure water. A
T-s diagram can be constructed for any pure substance. Itexhibits the same features as P-u
diagrams.
Temperature
Entropy (T-s) Diagram
In the liquid-vapor region in Figure 13,
water and steam exist together. For example, at pointA,
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 foundusing
the following relationship.
