SOLAR-DRIVEN DRY REFORMING OF METHANE ON THE OPEN-CELL FOAM TO IMPROVE THE ENERGY STORAGE EFFICIENCY IN A THERMOCHEMICAL FLUIDIZED BED MEMBRANE REFORMER: A COMPUTER SIMULATION APPROACH

2021 ◽  
Author(s):  
Paulo Costa ◽  
Daniel Ribeiro Dessaune ◽  
Jornandes Silva
Keyword(s):  
Computer Simulation ◽  
Energy Storage ◽  
Dry Reforming ◽  
Dry Reforming Of Methane ◽  
Simulation Approach ◽  
Storage Efficiency ◽  
Open Cell ◽  
Open Cell Foam ◽  
Energy Storage Efficiency ◽  
Cell Foam

scholarly journals CFD Simulations of Radiative Heat Transport in Open-Cell Foam Catalytic Reactors

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 716 ◽  
Author(s):  
Christoph Sinn ◽  
Felix Kranz ◽  
Jonas Wentrup ◽  
Jorg Thöming ◽  
Gregor D. Wehinger ◽  
...  
Keyword(s):  
Thermal Radiation ◽  
Heat Transport ◽  
Dry Reforming Of Methane ◽  
Small Scale ◽  
Catalytic Reactors ◽  
Open Cell ◽  
Open Cell Foam ◽  
Temperature Levels ◽  
Cell Foam ◽  
Thermal Conductivities

The heat transport management in catalytic reactors is crucial for the overall reactor performance. For small-scale dynamically-operated reactors, open-cell foams have shown advantageous heat transport characteristics over conventional pellet catalyst carriers. To design efficient and safe foam reactors as well as to deploy reliable engineering models, a thorough understanding of the three heat transport mechanisms, i.e., conduction, convection, and thermal radiation, is needed. Whereas conduction and convection have been studied extensively, the contribution of thermal radiation to the overall heat transport in open-cell foam reactors requires further investigation. In this study, we simulated a conjugate heat transfer case of a µCT based foam reactor using OpenFOAM and verified the model against a commercial computational fluid dynamics (CFD) code (STAR-CCM+). We further explicitly quantified the deviation made when radiation is not considered. We studied the effect of the solid thermal conductivity, the superficial velocity and surface emissivities in ranges that are relevant for heterogeneous catalysis applications (solid thermal conductivities 1–200 W m−1 K−1; superficial velocities 0.1–0.5 m s−1; surface emissivities 0.1–1). Moreover, the temperature levels correspond to a range of exo- and endothermal reactions, such as CO2 methanation, dry reforming of methane, and methane steam reforming. We found a significant influence of radiation on heat flows (deviations up to 24%) and temperature increases (deviations up to 400 K) for elevated temperature levels, low superficial velocities, low solid thermal conductivities and high surface emissivities.

scholarly journals The Impact of Active and Passive Thermal Management on the Energy Storage Efficiency of Metal Hydride Pairs Based Heat Storage

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3006
Author(s):  
Serge Nyallang Nyamsi ◽  
Ivan Tolj
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Thermal Management ◽  
Metal Hydride ◽  
Heat Storage ◽  
Energy Storage Density ◽  
Storage Efficiency ◽  
Transfer Enhancement ◽  
Storage Density ◽  
Energy Storage Efficiency

Two-tank metal hydride pairs have gained tremendous interest in thermal energy storage systems for concentrating solar power plants or industrial waste heat recovery. Generally, the system’s performance depends on selecting and matching the metal hydride pairs and the thermal management adopted. In this study, the 2D mathematical modeling used to investigate the heat storage system’s performance under different thermal management techniques, including active and passive heat transfer techniques, is analyzed and discussed in detail. The change in the energy storage density, the specific power output, and the energy storage efficiency is studied under different heat transfer measures applied to the two tanks. The results showed that there is a trade-off between the energy storage density and the energy storage efficiency. The adoption of active heat transfer enhancement (convective heat transfer enhancement) leads to a high energy storage density of 670 MJ m−3 (close to the maximum theoretical value of 755.3 MJ m−3). In contrast, the energy storage efficiency decreases dramatically due to the increase in the pumping power. On the other hand, passive heat transfer techniques using the bed’s thermal conductivity enhancers provide a balance between the energy storage density (578 MJ m−3) and the energy efficiency (74%). The utilization of phase change material as an internal heat recovery medium leads to a further reduction in the heat storage performance indicators (142 MJ m−3 and 49%). Nevertheless, such a system combining thermochemical and latent heat storage, if properly optimized, can be promising for thermal energy storage applications.

scholarly journals Simulation and optimization of the removal of toluene in air by ozonation with a catalytic open-cell foam

2021 ◽  
Vol 168 ◽  
pp. 453-464
Author(s):  
Audrey Cabrol ◽  
Antoine Lejeune ◽  
Ronan Lebullenger ◽  
Audrey Denicourt-Nowicki ◽  
Alain Roucoux ◽  
...  
Keyword(s):  
Open Cell ◽  
Simulation And Optimization ◽  
Open Cell Foam ◽  
Cell Foam

scholarly journals Hydrodynamics and Convective Heat Transfer in Open Cell Foam with Micropores

2021 ◽  
Vol 54 ◽  
pp. 64-68
Author(s):  
Olga Soloveva ◽  
Sergei Solovev ◽  
Ruzil Yafizov
Keyword(s):  
Heat Transfer ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Open Cell ◽  
Open Cell Foam ◽  
Cell Foam

scholarly journals Shear modulus of conventional and auxetic open-cell foam

2021 ◽  
Vol 157 ◽  
pp. 103818
Author(s):  
Nejc Novak ◽  
Olly Duncan ◽  
Tom Allen ◽  
Andrew Alderson ◽  
Matej Vesenjak ◽  
...  
Keyword(s):  
Shear Modulus ◽  
Open Cell ◽  
Open Cell Foam ◽  
Cell Foam
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