In this OTEC cycle, the vapor expands at moderate pressures and turn a turbine coupled to a generator that produces electricity.

Sure, I can explain the OTEC cycle step by step:

1. Warm Surface Water Intake: The first step in the OTEC cycle is the intake of warm surface water from the ocean. This water is usually around 25 degrees Celsius or warmer.

2. Vaporization: The warm surface water is used to heat a working fluid, which can be a gas or a liquid such as ammonia or a mixture of ammonia and water. The heat causes the working fluid to vaporize.

3. Turbine Rotation: The vaporized working fluid expands at moderate pressures and turns a turbine. The turbine is coupled to a generator.

4. Electricity Generation: As the turbine spins, it drives the generator, which produces electricity.

5. Cold Deep Water Intake: Cold water from the deep ocean is then taken in. This water is usually around 5 degrees Celsius.

6. Condensation: The cold deep water is used to cool and condense the working fluid vapor back into a liquid after it has passed through the turbine.

7. Recycle: The condensed working fluid is then recycled back to the beginning of the cycle, where it can be reheated by the warm surface water and the process can start again.

This cycle is continuous as long as there is a temperature difference between the surface water and the deep water, making OTEC a potential source of renewable energy.