Question

Explain ocean-thermal energy and how can it be harnessed. Mention any two limitations in obtaining the energy from the oceans

Answer 1

The difference in temperature between warm surface water heated by the sun and colder water found at ocean depth is a source of energy called ocean thermal energy. The difference in temperature is exploited in OTE conversion plants. The warm surface water is used to boil a volatile liquid like ammonia. The vapours are used to run the turbine of a generator.
Limitations :
(i) Efficient commercial exploitation is difficult.
(ii) Expensive set up.