Realization of Energy Harvesting and Temperature Indication Functions for Zero-Energy Thermos

This work employs conceptual design, a numerical model, dimension optimization, and properly-selected materials to realize energy harvesting and temperature indication functions for a zero-energy thermos. Firstly, a phase change material and wavelength-selective transmitting polymer wall are adopted together to harvest solar heat via the greenhouse effect. Next, two thermochromic pigments are utilized for temperature indication. The displayed color pairs can represent fluid status as hot (> 338.15 K), warm (328.15 K – 338.15 K), or lukewarm (< 328.15 K). Indicating temperature both assures the users’ safety and specifies the best time having a hot drink. A numerical model is constructed for dimension optimization using the Taguchi method. A prototype of zero-energy thermos is then generated for experimental demonstration. Transient thermal analysis is also executed with aids from numerical modeling