Heat transfer is a key process that occurs in everyday life, whether it involves maintaining the warmth of the food, or various industrial processes. This term includes three primary mechanisms of transfer: conduction, convection, and radiation. To minimize heat loss or retain coldness, different insulating materials are used. This paper examines the effectiveness of different materials in insulating a thermos bottle. The experiment involved three types of insulation methods: a standard vacuum thermos bottle, a vacuum thermos bottle with added mineral wool, and a vacuum thermos bottle with added cardboard. The ability of each model to maintain the initial temperature of the liquid was analyzed at three different
temperatures (5 °C, 40 °C, and 90 °C) over time intervals of half an hour, one, and two hours. The objective of the study was to determine the optimal conditions for maintaining heat or coldness, using the Taguchi method for factor analysis and optimization.
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