## Thermodynamically Consistent Set of Equations

There are differential relations between properties of working fluid. By using
the so-called thermodynamic potentials i.e. specific free energy (**Helmholtz function f**) and
specific free enthalpy (**Gibbs function g**), which are related by the following equation:

**g = f + P v**

we can write:

where,

**
P= Pressure**

T= Temperature

v= Specific volume

h= Specific enthalpy

s= Specific entropy

Any set of equations which satisfy the above mentioned relations is called a thermodynamically consistent
set of equations. These equations can be based on experimentally obtained data.

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