¿Cómo funciona un ciclo Rankine ideal?

Thermodynamic Cycle Overview

Introduction to the Simple Ranking Cycle

• The video presents a simple ranking cycle consisting of a turbine, condenser, pump, and boiler, alongside a temperature-entropy graph to illustrate fluid behavior through these devices.

State of the Working Fluid

• At point number 1, the working fluid is in a state of superheated vapor with high temperature and entropy, indicating it possesses significant internal energy.

• The fluid transfers its energy to the turbine for work conversion; as it passes through the turbine, both pressure and energy decrease while maintaining an adiabatic reversible process.

Condensation Process

• The fluid enters the condenser at lower temperatures but constant entropy; its primary function is to condense the working fluid ideally into saturated liquid.

• The condenser operates under constant pressure conditions (isobaric), acting as a thermal sink where heat is rejected to the environment or other mediums like rivers.

Pump Functionality

• The pump only works with liquid; low pressures at its entrance can lead to cavitation—a phenomenon that can severely damage pumps due to bubble formation.

• The pump's role is crucial for increasing pressure in compressed liquid before sending it back to the boiler. It does not significantly change volume since water is incompressible.

Boiler Operation and Cycle Completion

• A large reservoir supplies heat energy to the boiler, which functions as a heat exchanger aimed at producing steam from compressed liquid.

• This process transforms compressed liquid into superheated vapor, completing one cycle of operation.

Efficiency Considerations

• The net work output from this cycle equals the input heat supplied by the reservoir. If net work equals supplied heat, efficiency could theoretically reach 100%.