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Author: Rizzo, Enrico
Publisher: KIT Scientific Publishing
ISBN: 3731501325
Category : Technology & Engineering
Languages : en
Pages : 232
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Book Description
Techniques based on numerical simulations have been applied to the analysis of the heat exchanger and the High Temperature Superconductor (HTS) module of HTS current leads. In the first case correlations have been derived for the meander flow geometry. In the second case steady state and transient thermal-electric models have been validated. Both techniques are used to design and optimize HTS current leads. The correlations were applied to a predictive analysis of the ITER HTS current leads.
Author: Rizzo, Enrico
Publisher: KIT Scientific Publishing
ISBN: 3731501325
Category : Technology & Engineering
Languages : en
Pages : 232
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Book Description
Techniques based on numerical simulations have been applied to the analysis of the heat exchanger and the High Temperature Superconductor (HTS) module of HTS current leads. In the first case correlations have been derived for the meander flow geometry. In the second case steady state and transient thermal-electric models have been validated. Both techniques are used to design and optimize HTS current leads. The correlations were applied to a predictive analysis of the ITER HTS current leads.
Author: Enrico Rizzo
Publisher:
ISBN: 9781013280979
Category : Science
Languages : en
Pages : 224
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Book Description
Techniques based on numerical simulations have been applied to the analysis of the heat exchanger and the High Temperature Superconductor (HTS) module of HTS current leads. In the first case correlations have been derived for the meander flow geometry. In the second case steady state and transient thermal-electric models have been validated. Both techniques are used to design and optimize HTS current leads. The correlations were applied to a predictive analysis of the ITER HTS current leads. This work was published by Saint Philip Street Press pursuant to a Creative Commons license permitting commercial use. All rights not granted by the work's license are retained by the author or authors.
Author: Bertrand Dutoit
Publisher: World Scientific
ISBN: 9811271453
Category : Science
Languages : en
Pages : 329
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Book Description
This book aims to present an introduction to numerical modeling of different aspects of large-scale superconducting applications: electromagnetics, thermal, mechanics and thermo-hydraulics. The importance of computational modeling to advance current superconductor research cannot be overlooked, especially given the enormous benefits provided by superconductors in many human endeavours, including energy generation, medical treatments, and future electrical technologies.Aimed at graduate students, researchers and practitioners in different fields of applied superconductivity, this book consists of four chapters. The chapter on electromagnetics provides a review of the state-of-the-art modeling of electromagnetic phenomena in superconductors, emphasising the theoretical aspects of the different numerical formulations. This is followed by a chapter on thermal effects, dedicated to the simulation of thermal stability and quench in superconducting magnets, with specific examples of magnets used in particle accelerators. Then, the chapter on mechanics provides details of the modeling of forces and stresses in cables composed of second-generation high-temperature superconducting wires. Finally, the chapter on thermo-hydraulics focuses on the fundamental thermal-hydraulic aspects involved in the cooling of superconducting magnets, with special reference to the issues related to the forced-flow cooling.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 704
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Book Description
Author: Swarn S. Kalsi
Publisher: John Wiley & Sons
ISBN: 1118110099
Category : Technology & Engineering
Languages : en
Pages : 228
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Book Description
The only one-stop reference to design, analysis, and manufacturing concepts for power devices utilizing HTS. High temperature superconductors (HTS) have been used for building many devices for electric grids worldwide and for large ship propulsion motors for the U.S. Navy. And yet, there has been no single source discussing theory and design issues relating to power applications of HTS—until now. This book provides design and analysis for various devices and includes examples of devices built over the last decade. Starting with a complete overview of HTS, the subsequent chapters are dedicated to specific devices: cooling and thermal insulation systems; rotating AC and DC machines; transformers; fault current limiters; power cables; and Maglev transport. As applicable, each chapter provides a history of the device, principles, configuration, design and design challenges, prototypes, and manufacturing issues, with each ending with a summary of the material covered. The design analysis and design examples provide critical insight for readers to successfully design their own devices. Original equipment manufacturer (OEM) designers, industry and utilities users, universities and defense services research groups, and senior/postgraduate engineering students and instructors will rely on this resource. "HTS technology reduces electric losses and increases the efficiency of power equipment. This book by Swarn Kalsi, a leading expert on the HTS subject, provides a survey of the HTS technology and the design rules, performance analyses, and manufacturing concepts for power application-related devices. It compares conventional and HTS technology approaches for device design and provides significant examples of devices utilizing the HTS technology today. The book is useful for a broad spectrum of professionals worldwide: students, teaching staff, and OEM designers as well as users in industry and electric utilities." —Professor Dr. Rolf Hellinger, Research and Technologies Corporate Technology, Siemens AG
Author: Joseph Milnes
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Efficient heat transfer technologies are essential for magnetically confined fusionreactors; this applies to both the current generation of experimental reactors as well asfuture power plants. A number of High Heat Flux devices have therefore been developedspecifically for this application. One of the most promising candidates is theHyperVapotron, a water cooled device which relies on internal fins and boiling heattransfer to maximise the heat transfer capability. Over the past 30 years, numerous variations of the HyperVapotron have been built andtested at fusion research centres around the globe resulting in devices that can nowsustain heat fluxes in the region of 20? 30MW/m2 in steady state. Unfortunately, therehave been few attempts to model or understand the internal heat transfer mechanismsresponsible for this exceptional performance with the result that design improvements aretraditionally sought experimentally which is both inefficient and costly. This thesis seeks to develop an engineering model of the HyperVapotron device usingcommercial Computational Fluid Dynamics software. To establish the most appropriatemodelling choices, in-depth studies were performed examining the turbulence models(within the Reynolds Averaged Navier Stokes framework), near wall methods, gridresolution and boiling submodels. Validation of the models is accomplished via comparison with experimental results aswell as high order Implicit Large Eddy Simulation methods. It is shown that single phasecavity flows and their related heat transfer characteristics (time-averaged) can beaccurately captured if the SST k-omega turbulence model is employed using a fine nearwallgrid throughout the cavity (e.g. y+
Author: Rajeev Das
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
"The application of superconductors has always fascinated engineers because of their ability to provide very small resistive losses. Electric machines developed using superconductors provide the advantage of lower volume, and higher efficiency compared to conventional machines with similar specifications.High temperature superconductors (HTS) display the property of superconductivity at relatively higher temperatures compared to conventional superconductors. The use of HTS in electric machines provides substantial benefits in terms of less energy spent on refrigeration. In the field of computational electromagnetics, HTS in low frequency devices pose a few unique challenges that demand different approaches from the existing techniques applied in normal materials and conventional superconducting materials. This dissertation investigates the properties of HTS and then attempts to address various issues that arise while modeling and optimizing HTS based devices.The high degree of non-linearity in HTS presents significant difficulty for a solution to converge. This thesis models the behavior of HTS based low frequency examples, and suggests an approach that improves the convergence and reduces the computation time. In this effort, the successive substitution method and the Aitken approximation were used to develop the proposed algorithm.Subsequently, a multiphysics model of HTS based current leads was developed. To analyze the magnetic field problem, a 2D technique was considered, and the analysis of thermal behavior used a 3D approach. This study helped in determining the approach to solve both types of field problems associated with current leads and coupling the two sets of problems.Computational approaches to solve HTS based problems are still in their infancy and there is a shortage of data in this field. In order to generate more data, which could then be used in optimization or modeling of HTS devices, this work examined statistical methods that could be applied in such scenarios. In this thesis, aspects such as sampling methods of search space and methods to construct surrogates were researched; the use of Latin hypercube sampling (LHS) and Generalized Regression Neural Network (GRNN) are proposed.This dissertation ultimately considers a real world example of HTS current leads to address some of the challenges associated with them, specifically the reduction of heat leakage, the material used and the AC loss. To achieve these three goals, multi-objective optimization was considered and Differential Evolution (DE), a stochastic based technique was used to achieve the optimization goals. This facet of the thesis establishes the viability of stochastic methods to optimize systems with multiple goals to satisfy and having HTS a highly non-linear material in them, along with the possible objective functions and constraint relations." --
Author:
Publisher:
ISBN:
Category : Refrigeration and refrigerating machinery
Languages : en
Pages : 680
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 934
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Book Description
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 448
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Book Description
