1,720,974 research outputs found
Introduction to thermal energy storage: solar, geothermal and hydrogen energy
No full textThis chapter explores the critical role of thermal energy storage in the context of solar, geothermal, and hydrogen energy. It emphasizes the imperative of sustainable development and environmental preservation by harnessing renewable resources. Renewable energy sources, including solar, geothermal, and hydrogen energy, are investigated for their potential to reduce greenhouse gas emissions, bolster energy security, and stimulate economic growth. This chapter underscores the substantial growth observed in renewable energy utilization, particularly in 2020, signifying a global shift toward cleaner energy alternatives. Technological advancements in energy capture and storage, together with the increasing global adoption of Net Zero strategies, have significantly expanded renewable and green energy production. These advances span from small-scale solar panel installations to vast offshore wind farms, innovative geothermal applications, and electricity generation through hydrogen. Solar energy, with its diverse applications, and the efficiency of solar thermal technology in capturing heat are examined. Geothermal energy’s multifaceted roles in power generation, agriculture, and building climate control are explored, with a focus on enhanced geothermal systems (EGS) and their potential for expanding this clean energy source. This chapter also delves into the versatility of hydrogen energy, derived from multiple sources, in applications ranging from electric vehicle power to industrial processes and energy storage. Despite the challenges posed by intermittency, land and water use, technical complexities, regulatory constraints, and implementation costs, this chapter emphasizes the necessity of developing and executing integration strategies for these renewable sources into energy systems and societies. This integration has the potential to significantly advance global energy transition and the realization of sustainable development objectives. This chapter offers profound insights into the dynamic realm of thermal energy storage and its pivotal role in shaping a sustainable and environmentally responsible energy future
Simulation and experimental analysis of hovering and flight of a quadrotor
Full text linkQuadcopters were the first heavier than air vertical take-offlanding vehicles. Quadrotors have become increasingly popularin the recent years finding a great variety of applications indifferent fields such as surveillance and small goods transport.The flight of quad-rotors are not easily analysed, butcomputational fluid dynamic simulations are a credible source ofreliable modelling. In the present paper, an analysis incomputational fluid dynamics (CFD) is presented performed ona quadrotor model SYMA X5SC with focus on the fuselage andthe rotor blades.The quadrotor is analysed in three different models; fuselage,rotor and full configuration. The models have been designedusing CAD tools and encapsulated in a volume domain. Volumeunstructured meshes are used and contain a maximum of 3.5million of cells. Each blade was assigned to a moving cell zonemaking it possible to rotate. Steady and unsteady flowsimulations have been carried out. Hover, and forward and sidewind cases were inspected. The flight was simulated for thehovering mode at three different angles of attack and free streamvelocities. <br/
Simulation and experimental analysis of hovering and flight of a quadrotor
Full text linkQuadcopters were the first heavier than air vertical take-offlanding vehicles. Quadrotors have become increasingly popularin the recent years finding a great variety of applications indifferent fields such as surveillance and small goods transport.The flight of quad-rotors are not easily analysed, butcomputational fluid dynamic simulations are a credible source ofreliable modelling. In the present paper, an analysis incomputational fluid dynamics (CFD) is presented performed ona quadrotor model SYMA X5SC with focus on the fuselage andthe rotor blades.The quadrotor is analysed in three different models; fuselage,rotor and full configuration. The models have been designedusing CAD tools and encapsulated in a volume domain. Volumeunstructured meshes are used and contain a maximum of 3.5million of cells. Each blade was assigned to a moving cell zonemaking it possible to rotate. Steady and unsteady flowsimulations have been carried out. Hover, and forward and sidewind cases were inspected. The flight was simulated for thehovering mode at three different angles of attack and free streamvelocities. <br/
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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