Pressure Drop and Heat Transfer Analysis of Long Length Internally Cooled HTS Cables
Pressure Drop and Heat Transfer Analysis of Long Length Internally Cooled HTS Cables
复制标题
长内冷高温超导电缆的压降和传热分析
DOI：
10.1109/tasc.2012.2233840
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发表时间：
2013
影响因子：
1.8
通讯作者：
V. Rao
中科院分区：
文献类型：
--
作者：
R. Dondapati;V. Rao
人们正在探索采用液氮 (LN2) 内部冷却的高温超导 (HTS) 电缆来实现高效电力传输。 HTS 电缆的冷却要求取决于几何形状、长度和工作电流。工作温度下的高温超导电缆接收来自不同来源的热通量，例如末端的引线、通过超导体的交流损耗以及通过绝缘体的热量泄漏。这些损失需要通过沿高温超导电缆长度的一个或多个位置处的制冷系统来调节。在这种情况下，重要的是要估计长 HTS 电缆中的压降以及通过两个终端之间的中央通道内部泵送低温流体 (LN2) 所需的相关泵送功率。在目前的工作中，考虑对基于 BSSCO 和 YBCO 带的长长度高温超导电缆进行分析，其中液氮的热物理性质被认为与温度相关。对不同流量的液氮进行压降和传热分析，得到摩擦系数、泵功率和传热速率。该分析对于表征高温超导电缆的工作流态和安全工作温度范围非常有用。
High temperature superconducting (HTS) cables, internally cooled by liquid nitrogen (LN2), are being explored for efficient power transmission. The cooling requirements of a HTS cable depend on the geometry, length, and operating current. The HTS cable at the operating temperature receives heat flux from different sources such as the leads at the ends, ac losses through superconductor and the heat-in-leak through insulation. These losses need to be accommodated by a refrigeration system at one or more locations along the length of the HTS cable. In this context, it is important to estimate the pressure drop in long length HTS cables and associated pumping power required to pump the cryogenic fluid (LN2) internally through the central channel between two terminations. In the present work, long length HTS cables based on BSSCO and YBCO tapes are considered for analysis, where the thermophysical properties of LN2 are considered to be temperature dependent. Pressure drop and heat transfer analyses are carried out for different flow rates of LN2 to obtain the friction factor, pumping power and heat transfer rate. This analysis is useful in characterizing the operating flow regime and safe operating temperature range in HTS cables.