Degrees of freedom for Reboiler

Degrees of freedom for Reboiler

Degrees of freedom

The degrees of freedom of a process define the maximum number of independently acting automatic controllers that can be placed on a process 

Degrees of freedom = number of variables – number of equations

Reboiler

In this case there are only two process variables and one defining equation is 

[HsWs =H1W1]

Two process variables are two flow variables 

hence the number of degrees of freedom of that process is one. 

Thus, a only one automatic controllers can be placed on it.