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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.

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. ByD9
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 vapour is generated. This vapour then drives a turbine to generate electricity. After it powers the turbine, the water vapour enters the condensing chamber, which is cooled by the water from the depths of the ocean. The water vapour is condensed in this chamber, producing drinking water. Meanwhile, waste salt water is discharged into the ocean and the process can be repeated.
Ocean thermal energy conversion (
Possible spelling mistake found.
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
This phrase/word (depending on the context) can be potentially replaced with :
only
5 degrees Celsius.

The main components of the system are an evacuated evaporation
You use this word too often, consider replacing it with
chamber
, a turbine and a condensing
You use this word too often, consider replacing it with
chamber
. The solar energy of the sun heats up the surface
You use this word too often, consider replacing it with
water
and this warm
You use this word too often, consider replacing it with
water
is introduced
into the evacuated evaporation
You use this word too often, consider replacing it with
chamber
, where it boils. As it boils, salt
is deposited
and
You use this word too often, consider replacing it with
water
Possible spelling mistake. 'vapour' is British English.
vapour
is generated
. This
Possible spelling mistake. 'vapour' is British English.
vapour
then drives a turbine to generate electricity. After it powers the turbine, the
You use this word too often, consider replacing it with
water
Possible spelling mistake. 'vapour' is British English.
vapour
enters the condensing
You use this word too often, consider replacing it with
chamber
, which
is cooled
by the
You use this word too often, consider replacing it with
water
from the depths of the ocean. The
You use this word too often, consider replacing it with
water
Possible spelling mistake. 'vapour' is British English.
vapour
is condensed
in this
You use this word too often, consider replacing it with
chamber
, producing drinking
You use this word too often, consider replacing it with
water
. Meanwhile, waste salt
You use this word too often, consider replacing it with
water
is discharged
into the ocean and the process can
be repeated
.
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IELTS essay 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.

Essay
  American English
2 paragraphs
152 words
This writing has been penalized,
text can't be
less than 250 words in Task 2
and less than 150 words in Task 1
5.0
Overall Band Score
Coherence and Cohesion: 5.5
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Lexical Resource: 5.5
  • Try to vary your vocabulary using accurate synonyms
  • Use less common question specific words that accurately convey meaning
  • Check your work for spelling and word formation mistakes
Grammatical Range: 6.5
  • Use a variety of complex and simple sentences
  • Check your writing for errors
Task Achievement: 5.0
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    Present relevant ideas
  • Fully explain these ideas
  • Support ideas with relevant, specific examples
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