Buoyancy assist adaptive charging and discharging thermal storage tank

Extensive numerical analysis was performed for the unsteady state, natural convection in the annular cylinders. The cylinder’s boundaries were thermally insulated, except the inner surface. The fluid (water) in the cylinder initially was assumed at a cold temperature while the inner surface was subjected to a high temperature. The time history for the heat transfer by diffusion and advection was studied. The time needed for fully charging the storage tank and rate of heat transfer was calculated. The predicted results were compared with the pure heat diffusion process and with a steady-state convection system. Therefore, CFD simulations were performed for natural convection in the storage tank. The main objective of this study was to establish correlations for the rate of heat transfer as a function of time and other controlling parameters. The correlation is needed in designing a thermal energy storage system for domestic and industrial heating processes. One of the drawbacks of the conventional thermal storage systems is the slow charging and discharging, where the heat transfer is mainly diffusion dominated. To overcome such a problem, a system was designed based on the natural convective heat transfer mechanism. Therefore, the heat transfer and fluid flow in a cylindrical storage tank were simulated for a range of Rayleigh numbers (104 to 108) and radius ratio. It was found that a convection-operated storage tank reduces the thermal charging process time drastically compared with the thermally diffusion charging process. The rate of reduction in the charging time mainly depends on the rate of heating and geometric parameter of the tank. To the best of the authors’ knowledge, the work is novel.

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“…For Ra = 10 7 : Nu = (0.34 + 35.5R)e −80Rτ (16) For Ra = 10 8 : Nu = (0.33 + 64R)e −(0.34+138 R)τ (17)…”

Section: Resultsmentioning

confidence: 99%

“…For example, in case of solar air heating, the air temperature decreases along the pipe height L and air inlet temperature changes with time. Therefore, the coupled boundary conditions between the air flowing in the pipe and tank domain should be applied to the model in more detail to conjugate the heat transfer problem [16].…”

Section: Energy Storagementioning

confidence: 99%

Transient Natural Convection in a Thermally Insulated Annular Cylinder Exposed to a High Temperature from the Inner Radius

2020

Self Cite

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“…To perform USC operation, a specific agent is integrated to supervise its status [64]. Certainly, the USC is prevented from overloading when the SoC USC displays the index (see (5)).…”

Section: Agent Ultra-capacitormentioning

confidence: 99%

Intelligent Energy Management for Off-Grid Renewable Hybrid System Using Multi-Agent Approach

Sami

2020

IEEE Access

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Smart Hybrid Home Power Systems are interested in studying power issues for isolated customers who have an off-grid power connection. The establishment of independent hybrid power systems has seen as a method of improving energy security. Our main goal is to ensure that energy is produced efficiently. To accomplish this objective, we have suggested a detailed simulation system in which the solar energy factor is considered as the main source. The system also incorporates energy storage devices to ensure safe energy distribution and recovery (Fuel Cell/Ultra-Capacitor). An Intelligent Energy Management System is developed and discussed to ensure that the system operates properly using a precise multi-agent system. The recommended power management system is designed to identify Multi-Agent tasks and to understand possible scenarios by the energy characteristics and energy demands. The reached results proved that the proposed system reaches the goals defined for Intelligent Energy Management System about an experimental database extracted from Tunisian climate services using Matlab/Simulink Software.

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Modeling and experimental validation and thermal performance assessment of a sun-tracked and cooled PVT system under low solar irradiation

Ocłoń

Cisek

Kozak-Jagieła

et al. 2020

Energy Conversion and Management

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Buoyancy assist adaptive charging and discharging thermal storage tank

Cited by 3 publications

References 25 publications

Transient Natural Convection in a Thermally Insulated Annular Cylinder Exposed to a High Temperature from the Inner Radius

Transient Natural Convection in a Thermally Insulated Annular Cylinder Exposed to a High Temperature from the Inner Radius

Intelligent Energy Management for Off-Grid Renewable Hybrid System Using Multi-Agent Approach

Modeling and experimental validation and thermal performance assessment of a sun-tracked and cooled PVT system under low solar irradiation

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