Abstract
The heat transfer analysis of multi-layer insulation (MLI) studied before does not consider that radiant energy is transmitted through the thin aluminum coatings of the insulation films. The radiation heat flux is analyzed only between the adjacent films. The thermal radiation coefficient of thin aluminum coatings studied by R. P. Shutt shows the radiant energy transmitted through the films is not negligible. If the transmissivity cannot be neglected, the thermal radiation heat transfer between distant films in the MLI must be considered. There are infinite numbers of different heat transfer paths of radiation in MLI. If the path is classified by the number of films through which the radiation is transmitted, the equation of energy of each film can be formulated. As the number becomes large, the thermal radiation attenuates more. Then the equation can be solved and gives the heat flux and the temperature of each film in MLI. The heat transfer in MLI is analyzed for different thickness of aluminum coating....
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