Optimization of conduction-cooled current leads with unsteady operating current
- Authors
- Chang, Ho-Myung; Kim, Min Jee
- Issue Date
- May-2009
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Current leads; Power applications; Electrical conductivity; Thermal conductivity
- Citation
- CRYOGENICS, v.49, no.5, pp.210 - 216
- Journal Title
- CRYOGENICS
- Volume
- 49
- Number
- 5
- Start Page
- 210
- End Page
- 216
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/21872
- DOI
- 10.1016/j.cryogenics.2009.01.006
- ISSN
- 0011-2275
- Abstract
- A generalized optimization method is presented for conduction-cooled or cryocooled current leads whose operating current may vary over a period of time. This study is part of our ongoing efforts to reduce the cooling load in HTS power applications, where the actual current level varies considerably over a day and over a year. The presented method is also applicable to superconducting magnets that are not always operational at full current. When the operating current is given as a function of time, the total or accumulated cooling load at the cold end is calculated by integrating the instantaneous load over the period. The optimal length-to-area ratio of conductor is determined to achieve a minimum in the total load. After an accurate procedure taking into full account the temperature-dependent properties of conductor is developed with numerical calculations, a simple and reasonably accurate method based on Wiedemann-Franz approximation is suggested for practical use. (C) 2009 Elsevier Ltd. All rights reserved.
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Collections - College of Engineering > Department of Mechanical and System Design Engineering > 1. Journal Articles
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