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some of the disadvantages of OTEC are given below:
- OTEC requires a lot of capital investment
- due to small temperature difference between the surface water and the deep water, the conversion efficiency is low(3%-4%)
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(1 - (287/295)) *100 = 2.711% efficiency. 273+14C = 287K 273+ 22C = 295K On Earth, it's more like 25C surface and 10C deep, ish, depending on where you are. In absolute (Kelvin) temperatures, that's 298K and 283K The Carnot efficiency (maximum possible efficiency) of this is 1 - 283 / 298 = 5% I met a guy years ago who reckoned he could get 3% real efficiency from his OTEC design. OTEC will always have extremely low efficiency. It relies for its success on the heat being free (it is) and on being able to shift vast amounts of ocean water around with minimal friction losses (that's a bit harder).
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