CLOSED cycle vs OPEN cycle
Open Cycle:
Working fluid is water
Warm surface water brought under vacuum, pressure lowered, water boils at lower temperature
Steam passes through turbine and is condensed into liquid and then discharged. Alternatively, the vapor can be passed through a heat exchanger cooled by cold water resulting in a source of FRESH WATER
Mini-OTEC tested by Lockheed Martin in Hawaii in 1979 produced an gross output of 50kWe. The cold water pipe dimensions were .71m diameter, 670 m long.
OTEC-1 produced 1MWe in Hawaii. The cold water pipe dimensions were 2.55m diameter and 670 m long. (Castellano, 1981)
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