Numerical simulation of a silicon-based latent heat thermal energy storage system operating at ultra-high temperatures

Zeneli, Myrto; Malgarinos, Ilias; Nikolopoulos, A.; Νikolopoulos, Nikos; Grammelis, Panagiotis; Karellas, Sotiriοs; Kakaras, E.

doi:10.1016/j.apenergy.2019.03.147

Cited by 47 publications

(4 citation statements)

References 51 publications

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“…To prevent dividing by zero,

ε

is utilized as a constant in the denominator when liquid fraction value is equal to zero. Very small value of its adopted and it is equal to 0.001 32 …”

Section: Numerical Modelmentioning

confidence: 99%

Performance enhancement of latent heat storage unit by the multiple chambers

2023

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The thermal conductivity of phase change material (PCM) is one of the essential variables for the fast heat transfer process for latent heat energy storage (LHES) units. The thermal characteristics of a novel LHES rectangular enclosure based on multiple chambers separated by insulating and rigid walls are numerically investigated. The enthalpy‐porosity strategy supported by the finite volume method is implemented to perform the simulation. Simulation results exhibited that thermal charging and discharging performance was enhanced without affecting the system's total heat storage capacity by creating multiple chambers. Liquid fraction, mean temperature, heat flux, contours of liquid fraction and temperature of PCM are demonstrated as a function of the melting time. The thermal charging time of PCM is diminished by increasing the number of chambers. Although, the consequences of the number of chambers on the melting time of PCM are diminished by surging the number of chambers. It was also found that continuously raising the heating temperature is not beneficial for reducing the total time of liquid fraction during melting. Thermal discharging performance is poor than that of the thermal charging process.

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“…To prevent dividing by zero,

ε

is utilized as a constant in the denominator when liquid fraction value is equal to zero. Very small value of its adopted and it is equal to 0.001 32 …”

Section: Numerical Modelmentioning

confidence: 99%

Performance enhancement of latent heat storage unit by the multiple chambers

2023

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“…Zeneli et. al [6] evaluated silicon based latent heat energy storage system to achieve storage at very high temperatures. Different vessel designs and their effect on silicon melting rate were considered.…”

Section: Introductionmentioning

confidence: 99%

Economic and Technical Performance Assessment of a Thermal Energy Storage System for Ancillary Services

Umdu

Bilir

2022

Sakarya University Journal of Science

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Increasing renewables in energy mix results in lower emissions but also increased fluctuations in the electricity grid. Current thermal energy conversion-based systems will stay as main electricity generation in the grid, and they will support base loads of the system. Whether these systems are fossil or geothermal sourced they need adaptive technologies to harmonize with the changing network. This study aims to investigate feasibility and performance to satisfy response demands for a proposed thermal energy storage system connected to feed stream of thermal power generation to support ancillary services in a case study in Turkey. Tin is selected as the phase change material for its good inductive properties. It is demonstrated numerically that the evaluated heat storage tank, filled with tin, provides adequate time for thermal discharging within time limits to benefit from hourly ancillary power market. Using hourly pricing data for entire 2020, it is found that proposed system shows better economic performance than investment requirement of ROI over 11% as stated in various literature for renewable energy systems. Analysis of system economic performance shows a ROI of 16% and NPV is 17.8% higher than required investment.

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“…The solidification of silicon in a closed truncated-cone domain was investigated without considering the density variation between solid and molten silicon [28]. Zeneli et al [29] performed a numerical analysis of a silicon-based LHS system for different shape containers, considering the buoyancy-empowered free convection and volume change during melting. Ray et al [30] analyzed the melting performance of silicon for different dimensions of rectangular enclosures, and obtained a correlation of liquid fraction as a function of dimensionless numbers.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of High-Temperature Latent Heat Storage Systems

et al. 2021

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High-temperature latent heat storage (LHS) systems using a high-temperature phase change medium (PCM) could be a potential solution for providing dispatchable energy from concentrated solar power (CSP) systems and for storing surplus energy from photovoltaic and wind power. In addition, ultra-high-temperature (>900 oC) latent heat storage (LHS) can provide significant energy storage density and can convert thermal energy to both heat and electric power efficiently. In this context, a 2D heat transfer analysis is performed to capture the thermo-fluidic behavior during melting and solidification of ultra-high-temperature silicon in rectangular domains for different aspect ratios (AR) and heat flux. Fixed domain effective heat capacity formulation has been deployed to numerically model the phase change process using the finite element method (FEM)-based COMSOL Multiphysics. The influence of orientation of geometry and heat flux magnitude on charging and discharge performance has been evaluated. The charging efficiency of the silicon domain is found to decrease with the increase in heat flux. The charging performance of the silicon domain is compared with high-temperature LHS domain containing state of the art salt-based PCM (NaNO3) for aspect ratio (AR) = 1. The charging rate of the NaNO3 domain is observed to be significantly higher compared to the silicon domain of AR = 1, despite having lower thermal diffusivity. However, energy storage density (J/kg) and energy storage rate (J/kgs) for the silicon domain are 1.83 and 2 times more than they are for the NaNO3 domain, respectively, after 3.5 h. An unconventional counterclockwise circular flow is observed in molten silicon, whereas a clockwise circular flow is observed in molten NaNO3 during charging. The present study establishes silicon as a potential PCM for designing an ultra-high-temperature LHS system.

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Numerical simulation of a silicon-based latent heat thermal energy storage system operating at ultra-high temperatures

Cited by 47 publications

References 51 publications

Performance enhancement of latent heat storage unit by the multiple chambers

Performance enhancement of latent heat storage unit by the multiple chambers

Economic and Technical Performance Assessment of a Thermal Energy Storage System for Ancillary Services

A Comparative Study of High-Temperature Latent Heat Storage Systems

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