Evacuated multilayer insulations with crinkled or embossed foils without spacers were investigated in a guarded hot plate apparatus. In order to quan tify the heat transfer mechanisms as well as their interaction, temperature dependent measurements of the total heat transfer coefficient were performed. The mean tem perature was varied between 260 and 550 K. Important parameters were type, coating and crinkling treatment of the foils as well as the number of foil layers at a given thickness.
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