58 research outputs found
Feasibility Study of Hydrogen Production from Wind Energy in Narvik
No full textThe use of renewable energy sources is gaining momentum globally as possible replacements for fossil fuels which have proven to be serial contributors to global warming. Hydrogen is one such environmentally friendly fuel with zero carbon emission proven to be reliable for use in the transport sector. Since hydrogen is an energy carrier, its mode of production has for a long time relied on high carbon emission fuels that negate its authority as emission-free fuel.
Therefore, this study investigates a green hydrogen production method based on water electrolysis using electrical energy from wind power. The project entails a detailed wind resource assessment around Narvik region through historical meteorological data analysis, and CFD simulations using Windographer and WindSim software programs to ascertain the viability of the wind power potential of the area. Thereafter, the project establishes suitable location(s) for appropriate wind turbine siting to generate optimal net AEP for use in the electrolysers. Subsequently, a detailed analytical calculation is conducted on the possible amount of hydrogen that can be produced when a water electrolyser system is installed at the Djupvik site based on the net AEP values obtained. Finally, there is determination of the probable cost estimates for such a venture
Numerical Study of Atmospheric Ice Accretion on Various Geometric Cross-sections
No full text This paper describes the numerical study of atmospheric ice accretion on four different geometric cross sections, circular, parabola, triangle and cube. Most structures are the combination of these four basic geometric cross sections. Understanding of the atmospheric ice accretion physics on these will provide a base for further analyses of ice accretion and its effects on complex structures. CFD based numerical analyses are carried out in this research work to understand the rate and shape of atmospheric ice growth on these cross sections. For constant wind speed and atmospheric temperature, the ice growth is simulated as function of time, where more ice accretion is found on cube as compared to three other cross sections. Parametric study to understand the effect of iced surface roughness showed a significant difference in ice growth, when compared with the case, where no surface roughness was assumed on the cross sections. </jats:p
Railway operations in icing conditions: a review of issues and mitigation methods
No full textThis article focuses on studying the current literature about railway operations in icing conditions, identifying icing effects on railway infrastructure, rolling stock, and operations, and summarizing the existing solutions for addressing these issues. Even though various studies have been conducted in the past on the impact of winter, climate change, and low temperatures on railway operations, not much work has been done on optimizing railway operations under icing conditions. This study demonstrates that further research is needed to better understand ice accretion and its effects on different parts of railways. It appears that railway infrastructure faces serious problems during icing conditions, and additional research in this field is required to precisely identify the problems and suggest solutions. Therefore, it is important to enhance the knowledge in this area and suitable optimal and cost-effective ice mitigation methods to minimize icing effects on railway operations and safety
Review of Icing Effects on Wind Turbine in Cold Regions
No full textThis paper describes a brief overview of main issues related to atmospheric ice accretion on wind turbines installed in cold climate region. Icing has significant effects on wind turbine performance particularly from aerodynamic and structural integrity perspective, as ice accumulates mainly on the leading edge of the blades that change its aerodynamic profile shape and effects its structural dynamics due to added mass effects of ice. This research aims to provide an overview and develop further understanding of the effects of atmospheric ice accretion on wind turbine blades. One of the operational challenges of the wind turbine blade operation in icing condition is also to overcome the process of ice shedding, which may happen due to vibrations or bending of the blades. Ice shedding is dangerous phenomenon, hazardous for equipment and personnel in the immediate area
Effect of Wind Turbine Blade Profile Symmetry on Ice Accretion
No full textA multiphase numerical study has been carried out to understand the effects of wind turbine blade profile (airfoil) symmetry on resultant ice accretion. Two symmetric (NACA 0006 & 0012) and two non-symmetric airfoils (NACA 23012 & N-22) were used for this preliminary study. Based upon the airflow field calculations and super cooled water droplets collision efficiency, the rate and shape of accreted ice was simulated for rime ice conditions. Analysis showed higher air velocity along top surface of the non-symmetric airfoils as compared to symmetrical airfoils that also effects the droplet behavior and resultant ice growth. Results show that change in blade profile symmetry effects the resultant ice accretion. For symmetric airfoils, more streamlines ice shapes were observed along leading edge as compared to non- symmetric airfoils.</jats:p
Study of atmospheric ice accretion on onshore structures using CFD based numerical approach
No full textPaper presented at the 9th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Malta, 16-18 July, 2012.Atmospheric ice accretion occurs, when super cooled water droplets come into contact with the exposed surface of a structure in cold regions like arctic and alpine. Most investigations of this subject have been performed using experimental techniques, but for the last decade or so the computational fluid dynamics (CFD) based numerical techniques have begun to play a significant role in understanding and simulating the atmospheric ice accretion on structures. This research work highlights the application of CFD in field of atmospheric ice accretion and describes the CFD based numerical analyses of atmospheric ice accretion on various on-shore structures such as wind turbine blades, circular overhead power line conductors and building’s air intake louvers. Numerical results of this research work are compared with the experimental data to validate and a good agreement is found.dc201
Numerical study of super cooled water droplet splashing and distribution spectrum on atmospheric ice accretion of wind turbine blade
No full textAtmospheric icing of transmission line circular conductor bundles in triplex configuration
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Study of Dry Ice Growth on Duplex Cylinders
No full textA study of dry ice growth on bundled (duplex) cylinders has been performed using icing wind tunnel experiments and computational fluid dynamics (CFD) numerical simulations. The aim of this study is to "fill the gaps" in the works of Wagner (2010) and Qing et al. (2018). The numerical simulations cover a range of possible icing conditions by varying the operating wind speed, median volume diameter, and for some cases−the angle of incidence between the cylinders. The obtained results for the 0° AoA show that the accreted ice masses ratio between the leeward and windward cylinder varies from ~ 100% to ~ 30%. The accreted ice masses ratio decreases with the increase in the wind speed and/or median volume diameter. For the cases with non-zero AoA, the accreted ice masses become approximately equal, when the AoA is large enough to produce a vertical separation equal or greater to one cylinder diameter
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