Ocean thermal energy utilization process in underwater vehicles: Modelling, temperature boundary analysis, and sea trail

2020 ◽  
Vol 44 (4) ◽  
pp. 2966-2983 ◽  
Author(s):  
Hongwei Zhang ◽  
Chongyi Liu ◽  
Yanan Yang ◽  
Shuxin Wang
Keyword(s):  
Thermal Energy ◽  
Underwater Vehicles ◽  
Energy Utilization ◽  
Boundary Analysis ◽  
Temperature Boundary ◽  
Ocean Thermal Energy

scholarly journals Investigation of Self-Driven Profiler with Buoyancy Adjusting System towards Ocean Thermal Energy

2021 ◽  
Vol 11 (15) ◽  
pp. 7086
Author(s):  
Qingchao Xia ◽  
Gul Muhammad ◽  
Bingzhe Chen ◽  
Feng Zhang ◽  
Zhifeng Zhang ◽  
...  
Keyword(s):  
Thermal Energy ◽  
Underwater Vehicles ◽  
Hydraulic Control ◽  
Ocean Energy ◽  
Short Life ◽  
Diagram Method ◽  
Driving System ◽  
Short Life Span ◽  
Ocean Thermal Energy

An underwater profiler is one of the popular platforms for ocean observation. Due to energy limitations, conventional underwater vehicles have a short life span, which cannot meet the needs of long-term ocean exploration. Therefore, there is a growing interest in using ocean energy such as ocean thermal energy and wave energy for driving. This study aimed to investigate an energy-saving and ocean thermal energy (OTE)-powered buoyancy driving system of the ocean profiler. The purpose of this study was to explore an ocean profiler buoyancy driving system powered by ocean thermal energy (OTE). According to the seawater profile temperature gradient, an OTE-powered electro-hydraulic control system was designed, and the dynamic characteristics of this system are simulated and analyzed by using the power bonding diagram method. Based on the results conducted from lake tests, this profiler possesses the self-driving capability for using OTE perfectly. This research can provide important guidance for the design of the buoyancy drive system of underwater vehicles.

scholarly journals Ocean Thermal Energy Conversion—Flexible Enabling Technology for Variable Renewable Energy Integration in the Caribbean

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2192
Author(s):  
Robert J. Brecha ◽  
Katherine Schoenenberger ◽  
Masaō Ashtine ◽  
Randy Koon Koon
Keyword(s):  
Climate Change ◽  
Renewable Energy ◽  
Energy Conversion ◽  
Thermal Energy ◽  
Small Island ◽  
Gis Mapping ◽  
Ocean Thermal Energy Conversion ◽  
Thermal Energy Conversion ◽  
Hourly Data ◽  
Ocean Thermal Energy

Many Caribbean island nations have historically been heavily dependent on imported fossil fuels for both power and transportation, while at the same time being at an enhanced risk from the impacts of climate change, although their emissions represent a very tiny fraction of the global total responsible for climate change. Small island developing states (SIDSs) are among the leaders in advocating for the ambitious 1.5 °C Paris Agreement target and the transition to 100% sustainable, renewable energy systems. In this work, three central results are presented. First, through GIS mapping of all Caribbean islands, the potential for near-coastal deep-water as a resource for ocean thermal energy conversion (OTEC) is shown, and these results are coupled with an estimate of the countries for which OTEC would be most advantageous due to a lack of other dispatchable renewable power options. Secondly, hourly data have been utilized to explicitly show the trade-offs between battery storage needs and dispatchable renewable sources such as OTEC in 100% renewable electricity systems, both in technological and economic terms. Finally, the utility of near-shore, open-cycle OTEC with accompanying desalination is shown to enable a higher penetration of renewable energy and lead to lower system levelized costs than those of a conventional fossil fuel system.

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