Speaker
Dr
Monika Lewandowska
(Institute of Physics; Faculty of Mechanical Engineering and Mechatronics; West Pomeranian University of Technology, Szczecin, Poland)
Description
The analysis of cooling of a binary HTS 20 kA current lead (CL) operating between 4.5 and 300 K has been carried out. Assuming that the HTS module is conduction cooled, two cooling options for the copper heat exchanger (HEX) part of the CL have been considered, i.e. (1) cooling with a single flow of gaseous helium and (2) cooling with two flows of gaseous helium. The ideal refrigerator power required to cool a whole HTS current lead has been calculated for both cooling scenarios and different values of input parameters and the thermodynamic optimization for both cooling options have been performed. In addition, a preliminary analysis of the 3rd cooling option, in which both HTS and HEX parts of the CL are gas cooled, has been carried out. The obtained results indicate that the cooling options (2) and (3) cannot provide significant savings of the refrigerator power, as compared to the classical option (1). However, options (2) and (3) can provide other advantages over the option (1). It has been observed that at the same helium inlet temperature the temperature at the warm end of the HTS part, and the resulting number of HTS tapes, can be reduced in the option (2) with respect to the option (1). The option (3) appears to be recommendable in cases when high heat load in the HTS part due to AC losses, which cannot be effectively removed by heat conduction only, is expected.
Authors
Dr
Monika Lewandowska
(Institute of Physics; Faculty of Mechanical Engineering and Mechatronics; West Pomeranian University of Technology, Szczecin, Poland)
Dr
Rainer Wesche
(EPFL/CRPP, Fusion Technology Division, CH-5232 Villigen-PSI, Switzerland)
