Open And Closed Otec Cycles Pdf
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Ocean thermal energy conversion
Ocean Thermal Energy Conversion OTEC uses the ocean thermal gradient 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 can operate with a very high capacity factor and so can operate in base load mode. The denser cold water masses, formed by ocean surface water interaction with cold atmosphere in quite specific areas of the North Atlantic and the Southern Ocean , sink into the deep sea basins and spread in entire deep ocean by the thermohaline circulation. Upwelling of cold water from the deep ocean is replenished by the downwelling of cold surface sea water. Among ocean energy sources, OTEC is one of the continuously available renewable energy resources that could contribute to base-load power supply. 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 Ra.
Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. DOI: Aydin Published Materials Science. The research presented in this thesis provides thermodynamic insights on the potential advantages and challenges of adding a solar thermal collection component into ocean thermal energy conversion OTEC power plants. In that regard, this article reports the off-design performance analysis of a closed-cycle OTEC system when a solar thermal collector is integrated as an add-on preheater or superheater into the.
Uehara, H. November 1, Energy Eng. November ; 4 : — The parameters in the objective function consist of the velocities of cold sea water and warm sea water passing through the heat exchangers, the phase change temperature, and turbine configuration specific speed, specific diameter, ratio of blade to diameter.
Ocean thermal energy conversion
OTEC is environment-friendly and semi-permanent energy sources because its heat source is seawater warmed by the sun and no incineration and no CO 2 emission can be achieved. In this paper, it is focused on the cycle that is removed the regenerator, the absorber, and the diffuser from conventional Kalina cycle, and is returned the liquid working fluid separated with the separator to the inlet of the evaporator. The cycle was called R-cycle. It is compared N-cycle with a conventional Karina cycle by the numerical simulation. Two computational methods are used the program that is not treated the heat transfer performance of each heat exchanger, and other program that is treat the heat transfer performance of each heat exchanger and the condition of heat source.
The geographical location of Mauritius near the warm tropical waters of the Indian Ocean coupled to the vast exclusive economic zone approximating 2. An algorithm has been implemented to determine the net power generated from a proposed OTEC power plant, acquired through the processing of sea surface temperature satellite images, at a resolution of 1 km. The spatial and temporal variations of the net power generated has been observed by splitting the annual data into four monsoonal time frames. Moreover, the bathymetry of the southern region is propitious due to deep cold water availability at a proximity of less than 5km from the coastline. The energy and exergy efficiencies of the OTEC system are found to be 1. A cost—benefit analysis indicates that profits of the order of 4.
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