Rankine Cycle - Equations

Equations

In general, the efficiency of a simple Rankine cycle can be defined as:

Each of the next four equations is easily derived from the energy and mass balance for a control volume. defines the thermodynamic efficiency of the cycle as the ratio of net power output to heat input. As the work required by the pump is often around 1% of the turbine work output, it can be simplified.

When dealing with the efficiencies of the turbines and pumps, an adjustment to the work terms must be made.

_pump/ = - ≈ Δp/η_pump ≈ (-)/η_pump

_turbine/ = - ≈ (-)*η_turbine