It is said that a difference of 20^(@)C in temperature of water at two levels can be exploited to generate electricity. Name the power plant that can be used for this purpose. Describe the process and give its main advantage.

It is said that a difference of 20^(@)C in temperature of water at two

1.	It is said that a difference of 20^(@)C in temperature of water at two levels can be exploited to generate electricity. Name the power plant that can be used for this purpose. Describe the process and give its main advantage.
Answer» SOLUTION :It is correct that a difference of `20^(@)C` in TEMPERATURE of water at two levels can be exploited to generate electricity. For this purpose, Ocean Thermal Energy Conversion (OTEC) power plants are used. To use this plant, a difference of `20^(@)C` or more between the temperature of surface waters and water at depths of 1000 METERS is required. In one of Ocean Thermal Energy Conversion system, the warm surface water is used to boil low boiling liquid like ammonia, or a chlorofluorocarbon. The VAPOURS of the liquid are then sent to move the turbines of generator. The cold water from the depths is used to cool the vapour escaped from the turbines and CONVERTED into liquid to be used again.