Rankine Cycle: Screencasts

Describes the steps in a power cycle that converts high temperature heat into work using a turbine.

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Describes a Rankine power cycle with steam using a log pressure versus enthalpy diagram.

We suggest you list the important points in this screencast as a way to increase retention.

Important Equations:

Cycle thermal efficiency: $\eta = \frac{|W_{net}|}{Q_H} = \frac{|W_{turbine}+W_{pump}|}{Q_H}$ where $$W_{net}$$ is negative, $$W_{turbine}$$ is negative, and $$W_{pump}$$ is positive.

Energy balance for an adiabatic turbine: $\Delta H = W_{turbine}$ where $$\Delta H$$ is the enthalpy change across the turbine and $$W_{turbine}$$ is the shaft work generated by the turbine.

Turbine efficiency: $\eta = \frac{W_{irrev}}{W_{rev}}*100$ where $$W_{irrev}$$ is the net work generated by an irreversible turbine and $$W_{rev}$$ is the net work generated by a reversible turbine. Note that the same symbol $$\eta$$ is often used for both a turbine efficiency and a cycle efficiency.

Entropy change for a reversible adiabatic turbine: $\Delta S = 0$