Abstract
Thermal characteristics of multilayer insulation (MLI) were experimentally investigated by using boil‐off calorimetry. For cryogenic instrument applications such as a HTS power cable system, it is essential to design efficient thermal insulation system. It is well known that the thermal characteristics and heat transfer of MLI are greatly affected by various MLI parameters such as the number of layers and layer density. However, it is difficult to know the thermal characteristics of MLI correctly. The heat leak through MLI between room temperature and liquid nitrogen temperature was measured at various conditions using a cylindrical cryostat. The cryostat consists of two guard vessels located at both ends and a test vessel between them. The guard vessels are also filled with liquid nitrogen to prevent radiation heat leak through the ends of the cylindrical test vessel to measure the heat leak only through the MLI. In this paper, in order to investigate the effect of the wrapping method on the heat leak, we tested two different wrapping methods.
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