Presentation Information
[APP1-10]Heat Leak Measurement of Multilayer Insulation under different Wrapping Strength
*Hiroaki Kobayashi1, Koshi Kato1, Makoto Otsuka1, Masae Kanda1, Satarou Yamaguchi1, Hirofumi Watanabe1 (1. Chubu Univ. (Japan))
Keywords:
Multilayer Insulation,Thermal Insulation,Contact Pressure,Wrapping Strength
One of the thermal insulation methods used for the cryogenic pipes which transport low temperature liquified gases is vacuum insulation using Multilayer Insulation (MLI). Since the thermal insulation performance of MLI depends on the thermal contact resistance between its layers, the heat leak through MLI can be affected by the wrapping strength. In fact, the heat leak variation has been observed experimentally by changing wrapping methods. Omori reported an analytical formula for contact pressure between layers in a self-compression of the MLI films which are wrapped over a horizontal cylinder without any external forces except for gravity. We investigated the effect of the wrapping strength to the heat leak by using a horizontal boil-off calorimeter, which simulates cryogenic pipes installed in horizontal configurations, and compared the result with the formula presented by Omori.