steady flow energy equation

Fig. shows a steady flow process

      Let us consider an open system through which the working substance flows at a steady rate.

      Supposing the fluid enters at (1) — (1) and leaves at (2) — (2)

      Total energy entering the system,

Then according to 1st law of thermodynamics,

This equation is known as steady flow energy equation (SFE).

      Steady flow energy equation for unit mass of fluid,

Where                      h1, h2 = enthalpy of fluid entering and leaving the system

                                        q = heat supplied to system in J/kg

                                        w = work delivered by system.