Ocean thermal energy conversion (OTEC) uses the temperature difference between cooler deep and warmer shallow or surface seawaters to run a heat engine and produce useful work, usually in the form of electricity. OTEC is a base load electricity generation system. However, since the temperature differential is small, the thermal efficiency is low, making its economic feasibility a challenge.
Among ocean energy sources, OTEC is one of the continuously available renewable energy resources that could contribute to base-load power supply. The resource potential for OTEC is considered to be much larger than for other ocean energy forms [World Energy Council, 2000]. Up to 88,000 TWh/yr of power could be generated from OTEC without affecting the ocean’s thermal structure [Pelc and Fujita, 2002].
Systems may be either closed-cycle or open-cycle. Closed-cycle OTEC uses working fluids that are typically thought of as refrigerants such as ammonia or R-134a. These fluids have low boiling points, and are therefore suitable for powering the system’s generator to generate electricity. The most commonly used heat cycle for OTEC to date is the Rankine cycle, using a low-pressure turbine. Open-cycle engines use vapour from the seawater itself as the working fluid.
Nuestro día va a llegar, tendremos nuestra vez
no es pedir de más, quiero justicia...
Quiero trabajar en paz no es mucho lo que deseo
yo quiero trabajo honesto, en vez de esclavitud
Debe haber algún lugar donde el más fuerte, no te quiera
esclavizar... si estás sin chance
por qué tanta indiferencia se ha templado a hierro
y fuego? quién cuida las puertas de las fábricas?
el cielo era azul, más ahora es ceniza si
lo que era verde aquí ya no existe más
quién me hiciera acreditar, que ya acontece nada?
de tanto jugar con fuego, que venga el fuego ya...
ese aire dejó mi vista cansada.. y nada más.
y nada más...