Temperature–entropy diagram
In thermodynamics, a temperature–entropy (T–s) diagram is a thermodynamic diagram used to visualize changes to temperature (T ) and specific entropy (s) during a thermodynamic process or cycle as the graph of a curve.
It is a useful and common tool, particularly because it helps to visualize the heat transfer during a process.
[1] Working fluids are often categorized on the basis of the shape of their T–s diagram.
An isentropic process is depicted as a vertical line on a T–s diagram, whereas an isothermal process is a horizontal line.
This thermodynamics-related article is a stub.
For reversible processes , such as those found in the Carnot cycle :
Q
C
=
the amount of energy exchanged between the system and the cold reservoir
Q
H
=
W
+
Q
C
=
heat exchanged with the hot reservoir.
η
=
W
/ (
Q
C
+
Q
H
) =
thermal efficiency
of the cycle
If the cycle moves in a clockwise sense, then it is a heat engine that outputs work; if the cycle moves in a counterclockwise sense, it is a heat pump that takes in work and moves heat Q H from the cold reservoir to the hot reservoir.
