Open system: Exergy balance for a steady flow system

Fig. 1.31 An open system

Consider an open system (Fig. 1.31). Applying the first law of thermodynamics:

1.263

Second law of thermodynamics:

1.264

or,

1.265

From Eqs. (1.263) and (1.265),

1.266

or,

1.267

In the form of rate equation at steady state,

1.268

where,

1.269

For a single stream entering and leaving, the exergy balance is given by

1.270