Experimental and numerical investigations for effective thermal conductivity in packed beds of thermochemical energy storage materials

Walayat, Khuram; Duesmann, Jason; Derks, Thomas; Mahmoudi, Amir Houshang; Cuypers, Ruud; Shahi, Mina

doi:10.1016/j.applthermaleng.2021.117006

Cited by 19 publications

(3 citation statements)

References 49 publications

(53 reference statements)

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“…A wide variety of methods exist for characterizing the thermal conductivity of energy storage materials [10], and a subset of these have been applied to packed beds specifically. Computational models that simulate the behavior of packed bed systems have recently been employed to determine thermal conductivity [11,12]; the work of Hamidi et al [13] considers temperatures exceeding 1000 C. These methods rely on numerical simulations to emulate the behavior of packed beds in order to extract the bed thermal conductivity. Several experimental procedures have also been implemented for packed beds, especially with regards to metal hydrides.…”

Section: Introductionmentioning

confidence: 99%

Ultra-High Temperature Thermal Conductivity Measurements of a Reactive Magnesium Manganese Oxide Porous Bed Using a Transient Hot Wire Method

Hayes

Masoomi

Schimmels

et al. 2021

Journal of Heat Transfer

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The effective thermal conductivity of packed beds of magnesium-manganese oxide pellets is a crucial parameter for engineering Magnesium Manganese Oxide (Mg-Mn-O) thermochemical energy storage devices. We have measured the effective thermal conductivity of a packed bed of 3.66 ±0.516 mm sized magnesium manganese oxide (Mn to Mg molar ratio of 1:1) pellets in the temperature range of 300 to 1400°C. Since the material is electrically conductive at temperatures above 600°C, the sheathed transient hot wire method is used for measurements. Raw data is analyzed using the Blackwell solution to extract the bed thermal conductivity. The effective thermal conductivity standard deviation is less than 10% for a minimum of three repeat measurements at each temperature. Experimental results show an increase in the effective thermal conductivity with temperature from 0.50 W/m °C around 300°C to 1.81 W/m °C close to 1400°C. We propose a dual porosity model to express the effective thermal conductivity as a function of temperature. This model also considers the effect of radiation within the bed, as this is the dominant heat transfer mode at high temperatures. The proposed model accounts for micro-scale pellet porosity, macro-scale bed porosity, pellet size, solid thermal conductivity (phonon transport), and radiation (photon transport). The coefficient of determination between the proposed model and the experimental results is greater than 0.90.

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Section: Introductionmentioning

confidence: 99%

Ultra-High Temperature Thermal Conductivity Measurements of a Reactive Magnesium Manganese Oxide Porous Bed Using a Transient Hot Wire Method

Hayes

Masoomi

Schimmels

et al. 2021

Journal of Heat Transfer

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“…The best findings indicate that the temperature and conversion degree evolutions during charging and discharging exhibit a distinct uniformity in the bed owing to the excellent heat and mass transferability of the materials and obtained an overall thermal coefficient of performance of 80.9% and an exergy coefficient of performance of 27.7%. Walayat et al [269] investigated the effect of pressure, particle size, and packing arrangement on the heat behavior with a three-dimensional packed bed model (Figure 29) by considering the effective thermal conductivity of packed beds with K 2 CO 3 salt hydrates. Better heat transfer of a packed reactor is observed in numerical experiments at higher vapor pressures because of natural convection, while reaching a certain high pressure, the effect is no longer significant.…”

Section: Operating Conditionsmentioning

confidence: 99%

Salt Hydrate Adsorption Material-Based Thermochemical Energy Storage for Space Heating Application: A Review

et al. 2023

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Recent years have seen increasing attention to TCES technology owing to its potentially high energy density and suitability for long-duration storage with negligible loss, and it benefits the deployment of future net-zero energy systems. This paper provides a review of salt hydrate adsorption material-based TCES for space heating applications at ~150 °C. The incorporation of salt hydrates into a porous matrix to form composite materials provides the best avenue to overcome some challenges such as mass transport limitation and lower thermal conductivity. Therefore, a systematic classification of the host matrix is given, and the most promising host matrix, MIL-101(Cr)(MOFs), which is especially suitable for loading hygroscopic salt, is screened from the perspective of hydrothermal stability, mechanical strength, and water uptake. Higher salt content clogs pores and, conversely, reduces adsorption performance; thus, a balance between salt content and adsorption/desorption performance should be sought. MgCl2/rGOA is obtained with the highest salt loading of 97.3 wt.%, and the optimal adsorption capacity and energy density of 1.6 g·g−1 and 2225.71 kJ·kg−1, respectively. In general, larger pores approximately 8–10 nm inside the matrix are more favorable for salt dispersion. However, for some salts (MgSO4-based composites), a host matrix with smaller pores (2–3 nm) is beneficial for faster reaction kinetics. Water molecule migration behavior, and the phase transition path on the surface or interior of the composite particles, should be identified in the future. Moreover, it is essential to construct a micromechanical experimental model of the interface.

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“…For example, fuel pellets from biomass are used as a source of the primary energy as they can be burned to provide the energy when needed [2], and particle-packed beds as a part of the solar thermal systems are used to store the thermal energy in the secondary energy storage processes [3,4]. The combustion process of fuel pellets depends on their size and shape [5], and the morphology of the particle-packed bed determines the heat transfer efficiency of the solar thermal system [6].…”

Section: Introductionmentioning

confidence: 99%

Porous Structure of Cylindrical Particle Compacts

et al. 2021

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The porous compacts of non-spherical particles are frequently used in energy storage devices and other advanced applications. In the present work, the microstructures of compacts of monodisperse cylindrical particles are investigated. The cylindrical particles with various aspect ratios are generated using superquadrics, and the discrete element method was adopted to simulate the compacts formed under gravity deposition of randomly oriented particles. The Voronoi tessellation is then used to quantify the porous microstructure of compacts. With one exception, the median reduced free volume of Voronoi cells increases, and the median local packing density decreases for compacts composed of cylinders with a high aspect ratio, indicating a loose packing of long cylinders due to their mechanical interlocking during compaction. The obtained data are needed for further optimization of compact porous microstructure to improve the transport properties of compacts of non-spherical particles.

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Experimental and numerical investigations for effective thermal conductivity in packed beds of thermochemical energy storage materials

Cited by 19 publications

References 49 publications

Ultra-High Temperature Thermal Conductivity Measurements of a Reactive Magnesium Manganese Oxide Porous Bed Using a Transient Hot Wire Method

Ultra-High Temperature Thermal Conductivity Measurements of a Reactive Magnesium Manganese Oxide Porous Bed Using a Transient Hot Wire Method

Salt Hydrate Adsorption Material-Based Thermochemical Energy Storage for Space Heating Application: A Review

Porous Structure of Cylindrical Particle Compacts

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