Ocean thermal energy conversion produces
energy from temperature differences in ocean waters
. … Energy from the sun heats the surface water of the ocean. In tropical regions, surface water can be much warmer than deep water. This temperature difference can be used to produce electricity and to desalinate ocean water.
How does ocean thermal energy work?
OTEC uses the ocean’s warm surface water with a temperature of around 25°C (77°F) to
vaporize a working fluid
, which has a low-boiling point, such as ammonia. The vapor expands and spins a turbine coupled to a generator to produce electricity. … This is a continuous electricity generating cycle.
What is the cause of ocean thermal energy class 10?
The water at the surface of an ocean gets heated by the heat of the sun and attains a higher temperature than the colder water at deeper levels in the ocean
. … The energy available due to the difference in the temperature of water at the surface of the ocean and at deeper levels is called ocean thermal energy (OTE).
What is the byproduct of ocean thermal energy?
Explanation: The by-product in the ocean thermal energy conversion is
cold water
. The amount of cold water will be in large quantity.
Why is ocean thermal energy important?
The pros are OTEC is fuel free, has a
low environmental impact
, can supply pure water for both drinking and agriculture, can supply refrigeration and cooling and can provide a coastal community with reliable energy.
What are 5 advantages of hydropower?
- Renewable. Hydroelectric energy is classified as a renewable energy source because it is powered by water, and water is a naturally replenishing resource. …
- Low emissions. …
- Reliable. …
- Safe. …
- Environmental consequences. …
- Expensive to build. …
- Drought potential. …
- Limited reservoirs.
What are the disadvantages of ocean thermal energy?
- Capital investment is very high.
- Conversion efficiency is very low about 3-4% due to small temperature difference in between the surface water and deep water.
- Low efficiency of these plants coupled with high capital cost and maintenance cost makes them uneconomical for small plants.
Why ocean thermal energy is not possible?
Upwelling of cold water from the deep ocean is replenished by the downwelling of cold surface sea water. … The resource potential for OTEC is considered to be much larger than for other ocean energy forms.
Up to 88,000 TWh/yr
of power could be generated from OTEC without affecting the ocean’s thermal structure.
How does OTEC works in real life?
An OTEC power plant works by
pulling in warm ocean surface water
and this is used to heat a ‘working fluid’ such as ammonia or propane into a gas. These fluids have a low boiling temperature, which when turned into gas, moves the steam into pressurised shafts that are then used to drive turbines.
Who invented OTEC?
The OTEC concept was first proposed in the early 1880s by
the French engineer Jacques-Arsène d’Arsonval
. His idea called for a closed-cycle system, a design that has been adapted for most present-day OTEC pilot plants.
Where is ocean thermal energy used?
In tropical regions, surface water can be much warmer than deep water. This temperature difference can be used to produce electricity and to desalinate ocean water. Ocean Thermal Energy Conversion (OTEC) systems use a temperature difference (of at least 77° Fahrenheit) to
power a turbine to produce electricity
.
What is the condition under which ocean thermal energy can be trapped and used?
Explanation: OTEC uses the principle of
a heatengine
. It works by converting a temperature difference into energy. This means the difference in temperature between the warmer water on the surface and the cooler water in the depths of the ocean can be converted into electricity.
How many types of OTEC plant are there?
There are
three types
of OTEC systems: closed-cycle, open-cycle, and hybrid.
How much energy does ocean thermal energy produce?
IEA-OES 2006 Policy Report has shown that OTEC resources have the ability to produce
10000 TWh per year
, which is greater than other types of ocean energy such as tides, marine currents and salinity gradient. OTEC functions best when there is a temperature difference of 36° Fahrenheit (20°C).
How much energy does the earth receive from the sun?
In a single hour, the amount of power from the sun that strikes the Earth is more than the entire world consumes in an year. To put that in numbers, from the US Department of Energy:
Each hour 430 quintillion Joules
of energy from the sun hits the Earth. That’s 430 with 18 zeroes after it!
Why hydropower is not clean energy?
Hydropower dams and reservoirs emit methane, a greenhouse gas that is 20 times more potent than carbon dioxide. These emissions are caused by the decomposition of
organic vegetation flowing into the water
as the reservoir levels fluctuate, and as rivers and floodplains are flooded each year.
