What action is performed by the main condenser in the steam cycle?

The main condenser plays a crucial role in the steam cycle by condensing steam back into water. This process is vital for the efficiency of the steam cycle because, after the steam has passed through the turbine and done its work, it needs to be converted back into liquid water to be reused in the cycle.

In practical terms, the steam from the turbine enters the condenser where it is cooled, typically by seawater or another cooling medium. As the steam loses heat, it undergoes a phase change from gas back to liquid, resulting in water that can be pumped back to the steam generator or boiler. This not only allows for continuous operation within the system but also helps maintain a vacuum in the condenser, which contributes to the overall efficiency of the plant.

By efficiently converting steam back to water, the main condenser ensures that the steam generator has a steady supply of feedwater. This function is fundamental to maintaining the cycle and ensuring that energy can be harnessed effectively for propulsion or electrical generation.