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BEST Writing Task 1 IELTS Academic, 16th December
IELTS ACADEMIC WRITING TASK 1
IELTS ACADEMIC WRITING TASK 1
The diagram below shows the production of electricity using a system called Ocean Thermal Energy Conversion (OTEC).
SAMPLE ANSWER
The chart illustrates how the Ocean Thermal Energy Conversion (OTEC) system can produce electricity from seawater.
Three main stages are shown on the diagram. Heat energy transforms warm seawater, water vapour creates electric power and eventually runs back into the ocean again.
It is clear to see that there is a difference in temperature between surface seawater (29°C) and deep seawater (5°C), which OTEC uses to convert heat energy into electric power. Firstly, warm seawater flows into evacuated evaporation chamber, where it is evaporated by solar energy. Throughout this process, salt is deposited and water vapour is generated. In the next stage, water vapour drives a turbine to produce electricity.
At the third stage of this process, water vapour continues to enter to a condensing chamber. Afterwards, it is condensed by cold seawater from the depth of the ocean, producing drinking water. Waste salt water is discharged into the ocean and the process can be repeated.
