Autonomous Underwater Vehicle Thermoelectric Power Generation

Buckle, James; Knox, Andrew R.; Siviter, Jonathan; Montecucco, Andrea

doi:10.1007/s11664-013-2584-1

Cited by 28 publications

(13 citation statements)

References 4 publications

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“…Step 4: Update the optimal position of each particle (p i ), choose the particle with the best fitness and set its position as g(k), and update the velocity and position of each particle using Eqs. (5) and (6).…”

Section: The Proposed Rbfnn-pso Algorithmmentioning

confidence: 99%

“…Energy from ocean waves, tidal energy, current energy and thermal energy are the main forms of the marine renewable energy . Ocean thermal energy, which is formed by temperature gradients, constitutes a predictable and reliable source of energy and has an annual potential of 10,000 – 87,600 TWh . In torrid and temperate zones, ocean temperature differences of 20 °C between the sea surface and the deep sea are easily available, as the water temperature varies from more than 26 °C on the surface to less than 6 °C at 1 km depths …”

Section: Introductionmentioning

confidence: 99%

“…The efficiency of generating electricity using thermoelectric generators is very low when they are used in underwater carriers because the temperature difference is very small. For example, the underwater glider, in which energy storage materials that could storage heat energy temporarily are used as cold and heat source of TEGs, presents a low generation efficiency of 0.1%; this requires more than 5000 TEGs if the glider requires 6 kJ of energy per diving cycle, which leads to very high production costs . Phase change materials (PCMs) are used to store and release thermal energy via their latent heat in many application areas, such as buildings and in space applications .…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4] Ocean thermal energy, which is formed by temperature gradients, 5 constitutes a predictable and reliable source of energy and has an annual potential of 10,000 -87,600 TWh. 4,6 In torrid and temperate zones, ocean temperature differences of 20 C between the sea surface and the deep sea are easily available, as the water temperature varies from more than 26 C on the surface to less than 6 C at 1 km depths. 4 Ocean thermal energy can be extracted by ocean thermal energy conversion (OTEC) devices and ocean thermoelectric generators (OTEGs).…”

Section: Introductionmentioning

confidence: 99%

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Maximum efficiency point tracking for an ocean thermal energy harvesting system

et al. 2020

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Summary Limited energy is the most critical factor that restricts the persistent presence of underwater vehicles in the oceans; thus, harvesting the ocean's thermal energy that is stored in the water column between the sea surface and deep water is a particularly promising solution for the current power shortage. This paper has designed a new ocean thermal energy conversion system which using phase change material as energy storage medium, and proposed a novel maximum efficiency point tracking (MEPT) method for energy conversion. This new method, which is integrated with a radial basis function neural network (RBFNN), particle swarm optimization (PSO) and the proportion integration differentiation (PID) control method, could effectively improve the efficiency of energy conversion. Compared with the power generation system that does not use the MEPT method, experimental results show that the proposed method can improve the efficiency of the power generation from less than 19.05% to more than 34.3% and has higher stability (using this method: the efficiency changes from 34.3%‐34.7%; without using this method: the efficiency changes from 13.56% ‐19.05%) when the load changes. This novel method can be used in many conditions, especially when the mathematical model of the generation system is unknown or researchers want to use fewer sensors for maximum efficiency point tracking.

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Section: The Proposed Rbfnn-pso Algorithmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Maximum efficiency point tracking for an ocean thermal energy harvesting system

et al. 2020

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“…17 Currently, underwater vehicles using the above-mentioned renewable energies are being developed by scholars and researchers in various countries. [18][19][20][21] In terms of technical maturity, most underwater vehicles powered by renewable energies are still in the early stages of research and development, and there is still a long way to go for their practical engineering applications. Among them, the application of ocean thermal energy in underwater vehicle is relatively mature.…”

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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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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Porous Ag₂Se Fabricated by a Modified Cold Sintering Process with the Average zT Around Unity Near Room Temperature

Palaporn,

Pinitsoontorn,

Kurosaki

et al. 2023

Adv Materials Technologies

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Silver selenide (Ag2Se) is a promising material for thermoelectric applications near room temperature. This work proposes a new fabrication route for bulk Ag2Se via a modified cold sintering process (mCSP) to enhance its figure‐of‐merit (zT). Unlike conventional CSP, mCSP employs thiol‐amine (TA) as a liquid medium that completely undissolves Ag2Se, leading to a free flow of the TA solution within interparticle channels. By sintering at temperatures above the boiling point of TA, the liquid evaporates, leaving behind a bulk Ag2Se material with a tube‐like porous structure (open pores). These induced defects strongly influence thermoelectric properties of Ag2Se, with a substantial increase in the Seebeck coefficient and decrease in electrical conductivity. The overall power factor of the mCSP sample with TA surpasses that of the control sample without TA, consistent with effective band modeling of Ag2Se. Moreover, the created micropores during mCSP effectively suppresses the thermal conductivity, leading to a maximum zT above 1.0 at 400 K by optimizing mCSP parameters. Importantly, the average zT within the 300–400 K range is around unity, representing one of the highest reported values. Further optimization of mCSP parameters can enhance average zT beyond unity, making Ag2Se more competitive with state‐of‐the‐art materials near room temperature.

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Autonomous Underwater Vehicle Thermoelectric Power Generation

Cited by 28 publications

References 4 publications

Maximum efficiency point tracking for an ocean thermal energy harvesting system

Maximum efficiency point tracking for an ocean thermal energy harvesting system

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

Porous Ag₂Se Fabricated by a Modified Cold Sintering Process with the Average zT Around Unity Near Room Temperature

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Autonomous Underwater Vehicle Thermoelectric Power Generation

Cited by 28 publications

References 4 publications

Maximum efficiency point tracking for an ocean thermal energy harvesting system

Maximum efficiency point tracking for an ocean thermal energy harvesting system

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

Porous Ag2Se Fabricated by a Modified Cold Sintering Process with the Average zT Around Unity Near Room Temperature

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Product

Resources

About

Porous Ag₂Se Fabricated by a Modified Cold Sintering Process with the Average zT Around Unity Near Room Temperature