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Seyong Jung,Jisung Lee,Byungjun Park,Sangkwon Jeong,Junseok Ko,Jeonghyun Lee,Younghee Han,Jeongphil Lee,Byungchul Park,Hyerim Kim,Taehyun Sung IEEE 2009 IEEE transactions on applied superconductivity Vol.19 No.3
<P>This paper presents an idea for a thermosiphon that uniquely implements two integrated evaporators to cool two HTS (High Temperature Superconductor) bulk sets in different locations, simultaneously. A so-called double-evaporator thermosiphon was designed, fabricated and tested using nitrogen as the working fluid under sub-atmospheric pressure conditions. The operating target temperature was approximately 65 K. To confirm the feasibility of the double-evaporator thermosiphon, experiments during the cool down process and steady state operation were extensively conducted on the double-evaporator thermosiphon (L<SUB>tot</SUB> = 1075 mm, d<SUB>o</SUB> = 160 mm). The double-evaporator thermosiphon worked successfully at steady state operation. The results showed that it had a maximum total temperature difference between the condenser and the evaporator of 1.3 K and a temperature difference between the two evaporators of 0.6 K at a heat flow of 87 W. This thermosiphon was designed for actual application to a 100 kWh SFES (Superconducting Flywheel Energy Storage) system. The potential impact of superior heat transfer characteristics of the double-evaporator thermosiphon is discussed in the paper.</P>