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Articles 1 - 5 of 5
Full-Text Articles in Mechanical Engineering
Development Of A Computationally Efficient Method For Modelling Thermal Energy Storage In Packed Beds Of Spherically Encapsulated Phase Change Material, Colin Jaffray
Electronic Thesis and Dissertation Repository
A novel computationally efficient method for modelling melting and solidification processes in packed beds of PCM encapsulated spheres is introduced. The proposed method involves the full discretization of only one centrally located sphere to fully simulate the phase change process, while treating all other spheres in the packed bed as voids with boundary conditions derived from the simulated sphere. At each time step, the computed heat transfer parameters on the exterior surface of the simulated sphere undergoing the phase change process are extracted, and imposed as boundary conditions on surrounding spheres. The proposed method results in a significant reduction in …
Diffusion-Dependent Electrodes For All-Solid-State Lithium-Ion Batteries, Peiman Mardani
Diffusion-Dependent Electrodes For All-Solid-State Lithium-Ion Batteries, Peiman Mardani
Electronic Thesis and Dissertation Repository
Electrode design, which is closely related to electronic and ionic transport, has a significant impact on all-solid-state batteries' performance. Typically, a combination of the active material and solid electrolyte serves as the electrode for all-solid-state batteries. An effective scaling technique to spatially organize the two components is essential for high-performance all-solid-state batteries. Here, an electrode design for all-solid-state batteries is given with a higher energy density than the typical composite-type electrode. The first section of the thesis presents a simple electrode design that primarily consists of blended active materials of graphite and phosphorus to meet the demands of all-solid-state batteries …
Numerical Investigation Of Flow And Thermal Behavior In Channels With Pcm-Filled Thermal Energy Storage Columns For Potential Application In Photobioreactors, Sameed Akber
Electronic Thesis and Dissertation Repository
Microalgae has been identified as a potential source in the production of biofuel. Photobioreactors, which are used for microalgae production, normally experience temperature variations over the diurnal cycle due to changes in ambient conditions. The thermal regulation of photobioreactors to minimize temperature variations will result in a higher yield of microalgae, which are sensitive to such variations. The present research is aimed to investigate a novel approach to thermally regulate photobioreactors using phase change materials (PCM) where the latent heat of the material is exploited as the energy storage. The present research uses a numerical approach to study the flow …
Comparison Of Layered Nickel Cobalt Manganese Oxide Cathodes With Different Compositions And Morphologies In Lithium-Ion Batteries, Fanny Poon
Electronic Thesis and Dissertation Repository
The revolutionary rechargeable lithium-ion battery paves the way for environmentally-friendly applications such as electric vehicles. Nevertheless, further improvements are required to match or exceed the performance of conventional internal combustion engine vehicles, such as higher energy density, faster charging speed, longer lifetime, better safety and lower cost. Lithium layered nickel cobalt manganese oxides (NCM) are a popular choice of cathode material, but they still suffer from problems such as cation mixing, volume changes, microcracking, surface side reactions, high temperature performance issues and structural reconstruction. This thesis compares various NCM materials to figure out what guidelines should be followed to improve …
Behavior Of Hybrid And Monopile Foundation Systems For Owt: Centrifuge Testing And Numerical Modelling, Yazeed A. Alsharedah
Behavior Of Hybrid And Monopile Foundation Systems For Owt: Centrifuge Testing And Numerical Modelling, Yazeed A. Alsharedah
Electronic Thesis and Dissertation Repository
Offshore foundation systems are constantly evolving to meet the needs of new developments in energy sector. Moving into ever deeper water for hydrocarbon recovery or creating foundation systems for renewable energy sources, such as offshore wind Turbines (OWT) farms, creates specific challenges. Large fixed vertical tower structures are typically used to support OWT inducing complex loading on foundations as a result of combined wind, wave and self-weight loading effects, all of which must be accommodated within very small rotation envelopes and natural frequency band to allow the turbines to operate effectively. In this thesis, a hybrid foundation (H.F) comprising a …