Writing task 1 (process): The diagram below shows the production of electricity using a system called Ocean Thermal Energy Conversion (OTEC).
You should spend about 20 minutes on this task.
The diagram below shows the production of electricity using a system called Ocean Thermal Energy Conversion (OTEC).
Write a report for a university lecturer describing the information below.
Write at least 150 words.
The diagram explains how Ocean Thermal Energy Conversion (OTEC) generating electricity while producing drinking water using the difference of temperature between surface sea level and 1000 meters depth. On the surface, warm seawater which is usually at 29 Celsius is drained into the evacuated evaporation chamber. In this chamber, warm seawater is heated up by solar energy from the sun and evaporate. Salt is drained down and released back into the sea later. Saltless water vapour turns the turbine creating electricity. Then water vapor is leaded into condensing chamber where it condenses into pure water without salt. Meanwhile cold water from the depth, which is usually at 5 Celsius, is drained into a sewer system that circle the condensing chamber to cool down hot vapor, make it condense even faster. Pure water from condensing chamber is drained out and reused as drinking water. Salt from evaporation chamber join cold seawater and is released back into the sea.
The diagram illustrates the operation of Ocean Thermal Energy Conversion (OTEC) system generating electricity while producing drinking water by using solar energy to heat up seawater at the level from 1000 meters depth to the surface.
It is clear to see that the two main processes requires differrent types of chamber in the system. First, the warm seawater which is at 29 Celsius is leaded into the evacuated evaporation chamber where it is evaporated into saltless steam. Then, the saltless water vapour runs into turbine creating electricity, while the salt left is drained into the below sewer system where the the cold seawater at 5 Celsius is simultaneously leaded into and cold down the salt. This liquid moves around the condensing champer where the vapour after turning tubines comes as the input of the condensing process. Inside the consending chamber, the water vapour is condensed, creating the pure water for drinking, while the salt water moving around the chamber is drained out the process as waste water.
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