Optimization of a sensible heat storage unit packed with spheres of a local material

Ammar, A.S.A.; Ghoneim, Adel A.

doi:10.1016/0960-1481(91)90107-z

Cited by 23 publications

(6 citation statements)

References 2 publications

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“…Reducing from 30 to 10 mm would increase of the storage capacity of 2.5% (42 kWh). Indeed, the thermocline length would be thinner with TES material of smaller size, as it increases heat exchange surface between the fluid and the solid [29]. However, this solution would also increase pressure drops (from 3.3 to 13.4 mbar) and so costs linked to the fan (capital and operational expenditures) of the setup.…”

Section: Temperature Evolutionmentioning

confidence: 99%

Experimental and numerical analysis of a packed-bed thermal energy storage system designed to recover high temperature waste heat: an industrial scale up

Touzo

Olivès

Dejean³

et al. 2020

Journal of Energy Storage

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An industrial-scale air-ceramic horizontal packed-bed thermal energy storage (Eco-Stock®) has been designed and built by Eco-Tech Ceram and tested during an experimental campaign of 500h. The goal is to provide experimental data and analysis of a horizontal and containerized packed bed TES at high temperature, with performance indicators specific to waste heat recovery. A single charge-discharge at 525°C and 3 cycles at 500°C were carried out (300 kW Th for charge, 350 kW Th for discharge). The unit was able to store up to 1.9 MWh Th in a TES system (1.7 × 1.7 × 3.08 m 3 ) composed by 16-ton of bauxite ceramic media. The packed bed was able to valorize up to 90% of the heat source, which demonstrates the system ability to recover waste heat up to 525°C at industrial scale. No channeling effect and moderate radial thermal gradient were detected, even though the tank had a horizontal geometry. The plug and play TES presents a non-negligible part of its energy stored in the insulant, which can be recovered during discharge. To take into account such phenomenon, a one-dimension 3 temperature model is proposed. The model fitted well with experimental results, with a root mean standard deviation of the model below 20°C for the temperature profiles.

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Section: Temperature Evolutionmentioning

confidence: 99%

Experimental and numerical analysis of a packed-bed thermal energy storage system designed to recover high temperature waste heat: an industrial scale up

Touzo

Olivès

Dejean³

et al. 2020

Journal of Energy Storage

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“…Moreover, rocks act both as heat transfer surface and storage medium and does not require an expensive HTF. Their processing is easy and the heat transfer is good when used with air [7,29,83,[114][115][116][117][118].…”

Section: Sensible Heat Storage Materialsmentioning

confidence: 99%

Suitability and characteristics of rocks for sensible heat storage in CSP plants

Tiskatine

Oaddi

Cadi

et al. 2017

Solar Energy Materials and Solar Cells

119

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“…The increase of heat storage in packed beds due to the increase of bed material specific heat capacity with temperature is well known ( Aly and El-Sharkawy, 1990 ; Ammar and Ghoneim, 1991 ; Elouali et al., 2019 ; Hrifech et al, 2020 ; Kumar and Shukla, 2015 ; Tiskatine et al, 2017 ). In agreement, Figure 5(b) confirms increase of the Base Case sand specific heat capacity with temperature.…”

Section: Resultsmentioning

confidence: 99%

Understanding, controlling and optimising the cooling of waste thermal treatment beds including STARx Hottpads

et al. 2022

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STARx (Self-sustaining Treatment for Active Remediation ex situ) is a thermal treatment strategy for contaminated soils and organic wastes. Key to this technology is that organics are embedded in porous matrix beds (e.g. sand). STARx induces a self-sustaining smouldering combustion front that traverses the bed, burning away the embedded contaminants/wastes. The time and cost effectiveness of this technology is largely dictated by the time required for cooling of the hot, clean, porous matrix bed that remains after treatment. This study is the first to explore the cooling of these beds. A suite of novel simulations investigated the influence of key parameters on bed-cooling time. The results reveal that cooling time decreased nearly linearly with decreases of volume-averaged bed temperature and bed bulk density. Increased injection air fluxes led to the non-linear decrease of cooling time. Also, cooling time was negatively impacted by bed temperature inhomogeneity, which influenced preferential air flow through cooler regions of the bed, bypassing hotter regions. From these results, using lower bulk density bed materials, increased air fluxes and enhancing wall insulation to improve bed temperature homogeneity were identified as system optimisations to reduce cooling times. While the aim of this research is to improve the STARx cooling process, the results are also highly applicable to many similar engineering systems that involve hot porous bed cooling.

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Optimization of a sensible heat storage unit packed with spheres of a local material

Cited by 23 publications

References 2 publications

Experimental and numerical analysis of a packed-bed thermal energy storage system designed to recover high temperature waste heat: an industrial scale up

Experimental and numerical analysis of a packed-bed thermal energy storage system designed to recover high temperature waste heat: an industrial scale up

Suitability and characteristics of rocks for sensible heat storage in CSP plants

Understanding, controlling and optimising the cooling of waste thermal treatment beds including STARx Hottpads

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