THERMODYNAMIC DIAGRAMS

TYPES OF DIAGRAMS P-H DIAGRAM T-S DIAGRAM H-T DIAGRAM H-S DIAGRAM

P-H DIAGRAM

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.

T-S DIAGRAM

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

PROPERTY DIAGRAMS AND STEAM TABLES Thermodynamics Temperature-Entropy (T-s) Diagram A  T-s  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.

   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

REFRENCE A TEXTBOOK OF CHEMICAL

ENGINEERING THERMODYNAMICS BY K.V.NARAYANAN

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