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

Hong-wei, Zhang; Liu, Chongyi; Yang, Yanan; Wang, Shuxin

doi:10.1002/er.5123

Cited by 17 publications

(3 citation statements)

References 24 publications

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“…Thermal power generation is utilized as an energy module for ocean thermal underwater vehicle, which adopts PCMs ( n ‐Pentadecane, 34 n ‐Hexadecane, 39 etc.) for thermal exchange with the ocean environment.…”

Section: Working Principle and Phase Change Transfer Model Of Pcm Formentioning

confidence: 99%

“…Nevertheless, it lacks practical application in the sea trial. Zhang et al obtained the relationship between system pressure and the thermophysical properties of PCM with some empirical formulas and established a phase change transfer model of PCM 39 . On the basis, they analyzed the performance of the system under constant temperature and variable temperature conditions.…”

Section: Introductionmentioning

confidence: 99%

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Modification of the phase change transfer model for underwater vehicles: A molecular dynamics approach

et al. 2020

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The thermophysical properties of phase change material (PCM) directly affect the performance of underwater vehicles. The accuracy of the phase change transfer model is an important index for evaluating the performance of PCM as well. In this paper, a molecular dynamics approach is proposed to obtain the thermophysical properties of PCM under different pressures. On such a basis, the modified models of "temperature-pressure-density," "temperaturepressure-thermal conductivity" and "pressure-specific heat capacity" are established. By comparing the simulation results with the unmodified phase change transfer model and the laboratory experimental results, it can be seen that the modified phase change transfer model has higher accuracy. Furthermore, an ocean thermal energy conversion system for underwater vehicles is deployed in the South China Sea to test the utilization performance. By the contrast between the simulated calculation of the modified model and the sea trial results, it is found that the root mean square (RMS) of accumulator pressure between the simulation and sea trial is 0.2565, and the energy storage volume RMS is 1.6868. When the accumulator pressure reaches 205 bar, the time error is 0.58%, and the energy storage volume error is 3.16%. The results indicate that the modified model is effective in practical application.

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Section: Working Principle and Phase Change Transfer Model Of Pcm Formentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modification of the phase change transfer model for underwater vehicles: A molecular dynamics approach

et al. 2020

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“…One of the working principles of OTEC is a that utilizes the seawater temperature at the surface at 29 °C and the sea depth at 5 °C through an evaporator heat exchanger [8]. This OTEC requires a reliable heat transfer area because the heat exchanger operates in a harsh chemical environment, so a suitable heat exchanger is needed [9]. Previous research on the OTEC closed cycle using a heat exchanger with aluminum and nickel is more economical but short-lived, successful research has been carried out using a heat exchanger with titanium material [10].…”

Section: Introductionmentioning

confidence: 99%

Development of tin copper alloys in shell and tube evaporator heat exchanger systems in ocean thermal energy converse power plant

Mawardi

Wirjosentono

Ambarita

et al. 2022

EEJET

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A case study of the manufacture of an OTEC factory on a floating ship has been carried out using 100 MW Titanium material at a fairly expensive cost, so the OTEC system was researched using a copper-tin alloy. The behavior of the tin-copper heat exchanger between the Aspen Plus simulation and the Computational Fluid Dynamics (CFD) simulation on Shell And Tube evaporators of Bonnet Divided Flow fixed and Bonnet One-pass Shell fixed (BEM) types is investigated. The difference in temperature between water at sea level of 29 °C and water at a depth of 1000 meters at a temperature of 5 °C is assumed to produce electricity. A marine thermal energy conversion power plant is a continuous source of energy sourced from nature an evaporator heat exchanger with ammonia working fluid will produce power that can drive a turbine forwarded to a generator. The simulation results of CFD of a Bonnet Divided Flow fixed type Heat Exchanger on the hot water inlet line has a temperature of 29.9 °C, when exiting the evaporator shell the temperature decreases to 26.4 °C. At the inlet line, the working fluid of ammonia enters the evaporator at 7.9 °C and when it leaves the tube, the temperature rises to 26.3 °C. The best results of the simulation of Aspen Plus Heat Exchanger type BEM Inlet Ammonia temperature 8 °C and at CFD 7.99 °C. Meanwhile, at the ammonia outlet at 28 °C and in the CFD simulation, the ammonia outlet temperature was 28.21 °C. Aspen Plus Inlet heating water temperature is 30 °C, and in CFD simulation, the temperature is 29.99 °C. While the heating water outlet is 28 °C, and in the CFD simulation, the heating water outlet is 28.15 °C. The conclusion from the simulation results is that the BEM-type heat exchanger is very good and suitable for experimental prototyping.

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Self‐Sustained Artificial Internet of Things Based on Vibration Energy Harvesting Technology: Toward the Future Eco‐Society

Li,

Sun,

Huang

et al. 2024

Adv Energy and Sustain Res

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Clean energy has emerged as the focal point of global energy and power development. With the advancement of 5G technology and the Internet of Things (IoT), the demand for sustainable energy supply has become more pressing, leading to widespread attention to vibration energy harvesting technology. This technology enables the conversion of vibrational energy from natural phenomena such as ocean waves and wind, as well as machinery operation and human activities, into electrical energy, thus supporting the expansion of self‐sustained IoT systems. This review provides an overview of the progress in vibration energy harvesting technology and discusses the integration of this technology with self‐powered sensors and artificial intelligence. These integrations are reflected in the enhanced accuracy of environmental monitoring, increased efficiency in intelligent transportation and industrial production, and improved quality of life through intelligent healthcare and smart home. Such applications demonstrate the significant potential of self‐sustained artificial IoT in promoting environmental sustainability and elevating the level of intelligent living. In summary, exploring and applying vibration energy harvesting technology to support the autonomous operation of IoT devices is key to building a more sustainable, intelligent, and interconnected world.

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

Cited by 17 publications

References 24 publications

Modification of the phase change transfer model for underwater vehicles: A molecular dynamics approach

Modification of the phase change transfer model for underwater vehicles: A molecular dynamics approach

Development of tin copper alloys in shell and tube evaporator heat exchanger systems in ocean thermal energy converse power plant

Self‐Sustained Artificial Internet of Things Based on Vibration Energy Harvesting Technology: Toward the Future Eco‐Society

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