The diagram shows the process of producing electricity by using a system called Ocean Thermal Energy Conversion (OTEC).
Overall, this system uses warm and cold seawater to create electricity and also produces drinking water as a result. The process has several stages , including evaporation, electricity generation and condensation.
First, warm seawater from the ocean is changed into water vapour by using solar energy. This warm water enters an evacuated evaporation chamber, where the salt is removed , and fresh water vapour is created. The vapour then moves to a turbine, which is used to generate electricity.
After that, the water vapour goes through a chamber where it is condensed into pure water. The cold seawater, which is taken from around 1000 metres below the surface, helps this process happen. The temperature of the cold water is about 5°C, while the warm seawater is around 29°C.
Finally, the condensed water becomes drinking water, and the remaining salt water is released back into the ocean as waste. Overall, OTEC is a useful method because it can produce electricity and fresh water at the same time.