Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

ENTROPY GENERATION MINIMIZATION ON CIC (CABLE-IN-CONDUIT) SUPERCONDUCTOR DESIGN

Get access (open in a dialog) DOI: 10.1615/IHTC11.60
pages 33-38

Abstrakt

The concept of EGM (Entropy Generation Minimization) is applied to the design of an optimum CIC (Cable-In-Conduit) superconducting cable for large scale superconducting magnets. The CIC superconducting cable is cooled by supercritical helium flow inside conduit at cryogenic temperature. Three factors are considered to evaluate its performance under various operating conditions of the magnets. First, the void fraction of CICC (Cable-In-Conduit Conductor) is optimized to generate minimum entropy under steady-state operating condition. Second, the surface condition of the superconducting strands is investigated to find the best surface electrical resistance value between two extremities; insulation or perfect conduction. Third, the non-dimensionalized entropy generation rate is formulated to compare the advantage of hybrid superconducting cable (superconducting strands + pure copper strands) with the integral one (all superconducting strands). It is impossible to develop a universal CIC superconducting cable that is the best for every applications such as tokamak, SMES (Superconducting Magnetic Energy Storage), accelerator, MAGLEV (MAGnetic LEVitation train), power cable, etc. This paper, however, shows that the magnet performance can be optimized by considering the design concept of the less entropy-generating conductor design. The three design factors in this paper are just a few examples that the EGM technique can be applicable to not only thermohydraulic but also electromagnetic systems such as the superconducting cable in conduit.