Abstract
Liquid nitrogen is the foremost coolant when it comes to cooling HTS power devices due to its abundance and since it is more economical than other cryogens. Sub-cooled LN2 is preferred over saturated LN2 as it ofers substantial advantages in terms of performance. However, in the cases where it is not possible to cool HTS power cables using sub-cooled LN2, saturated LN2 is the only option. Additionally, even when sub-cooled LN2 is used for long length cables, the heat-in-leaks along with other core losses result in rise in temperature and an unavoidable two-phase fow afects the cooling characteristics of the cryogen. This paper deals with the modeling and numerical analysis of a two-phase fow through an HTS power cable cryostat to understand the temperature profle, the pressure drop per unit length, and required pumping power for circulation of cryogen.
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