Abstract. Benefits of an integrated high temperature superconducting (HTS) power system and the associated cryogenic systems on board an electric ship or aircraft are discussed. A versatile modelling methodology developed to assess the cryogenic thermal behavior of the integrated system with multiple HTS devices and the various potential configurations are introduced. The utility and effectiveness of the developed modelling methodology is demonstrated using a case study involving a hypothetical system including an HTS propulsion motor, an HTS generator and an HTS power cable cooled by an integrated cryogenic helium circulation system. Using the methodology, multiple configurations are studied. The required total cooling power and the ability to maintain each HTS device at the required operating temperatures are considered for each configuration and the trade-offs are discussed for each configuration. Transient analysis of temperature evolution in the cryogenic helium circulation loop in case of a system failure is carried out to arrive at the required critical response time. The analysis was also performed for a similar liquid nitrogen circulation for an isobaric condition and the cooling capacity ratio is used to compare the relative merits of the two cryogens. IntroductionHigh Temperature Superconducting (HTS) power devices are attractive for applications that require high power densities such as electric aircrafts and ships [1][2][3][4][5][6][7]. Future all-electric ships and aircrafts will have multiple large electrical loads and the integrated power system to support the loads needs to be flexible to meet the various potential missions. The trend is to reduce the size of aircrafts and ships to increase fuel economy and operational effectiveness [6,8]. The two apparently competing interests are being met with new technologies, integrated power systems, and innovative ship and aircraft designs. The large electrical loads on ships and aircrafts are required only in certain mission scenarios. Hence, power devices with high power densities and variable power ratings that offer tunability would facilitate meeting the design challenges of future all-electric ships and aircrafts. HTS technology has the ability to support the design goals while providing operational flexibility. HTS technology is particularly suitable for direct current (DC) systems and the navy has decided to adapt integrated DC power system for future all-electric ships and aircrafts. HTS materials offer a wide operating temperature window and their current carrying capability varies significantly depending on the cryogenic operating temperature; current density of HTS materials can change up to 10 times by changing the temperature by 40 K. Use of gaseous helium as the cryogen in conjunction with the cryocooler technology allows operating temperatures between 20 and 77 K, giving a large operating temperature window for HTS devices. High

No abstract

No abstract

No abstract