IELTS Writing Task 1 :The diagram below shows the production of electricity using a system called Ocean Thermal Energy Conversion (OTEC).

IELTS Writing Task 1 :The diagram below shows the production of electricity using a system called Ocean Thermal Energy Conversion (OTEC).

Model answer

Ocean thermal energy conversion (OTEC) is a system that converts heat energy into the electric power using the temperature difference between surface seawater, which can be up to 29 degrees Celsius, and deep seawater, which is only 5 degrees Celsius.

The main components of the system are an evacuated evaporation chamber, a turbine and a condensing chamber. The solar energy of the sun heats up the surface water and this warm water is introduced into the evacuated evaporation chamber, where it boils. As it boils, salt is deposited and water vapor is generated. This vapor then drives a turbine to generate electricity. After it powers the turbine, the water vapor enters the condensing chamber, which is cooled by the water from the depths of the ocean. The water vapor is condensed in this chamber, producing drinking water. Meanwhile, waste salt water is discharged into the ocean and the process can be repeated.