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1.
  • Javanroodi, Kavan, et al. (författare)
  • Towards Resilient Interconnected Urban Infrastructures : The Nexus Between Energy System, Urban Morphology, and Transportation Network
  • 2023
  • Ingår i: Proceedings of the 5th International Conference on Building Energy and Environment. - 1863-5520 .- 1863-5539. - 9789811998218 ; , s. 2739-2749
  • Konferensbidrag (refereegranskat)abstract
    • Compound optimization of distributed energy systems, urban morphology, and the transportation network is crucial to improving the robustness of interconnected urban energy infrastructures and enhancing their resilience to extreme climate events. Available methods and tools mainly focus on optimizing one component in urban areas and fail to consider complex interactions in interconnected infrastructures. This study introduces a compound optimization methodology that optimizes the energy system in connection with urban morphology and electric vehicle (EV) charging demands. In this regard, the energy demand of five multi-functional urban neighborhoods is assessed and optimized considering 13 climate scenarios (2010–2099). Results showed a significant improvement in autonomy level and a notable reduction of infrastructure costs (over 40%) by linking these three sectors. It is also shown that energy demand can increase up to 17% in extreme weather conditions, leading to over 30% infrastructure costs.
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2.
  • Zhang, Z., et al. (författare)
  • Electromagnetic wave-based analysis of laser–particle interactions in directed energy deposition additive manufacturing
  • 2020
  • Ingår i: Additive Manufacturing. - : Elsevier. - 2214-8604 .- 2214-7810. ; 34
  • Tidskriftsartikel (refereegranskat)abstract
    • A modified heat-source model based on electromagnetic wave theory was proposed to investigate the interactions between powder particles and a laser beam, considering the spatial distribution of particles inside the beam. The absorption of energy by these particles in laser directed energy deposition additive manufacturing was calculated using the proposed model, which was validated experimentally. Both numerical model and experiment were used to study the effects of powder velocities on the temperature variations in the additive manufacturing process. Results indicate that the direct heat transfer from the laser to a target can be increased if the size distribution is wider; it also increases with the velocity of the particles. However, with the increase of powder-flow rate, the rate of mass transfer decreases the heat transfer. Melt-pool depth in melting and re-melting processes can therefore be controlled by varying these parameters.
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