SKM 2023 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 21: Materials for Storage and Conversion of Energy: Energy Conversion
MM 21.1: Vortrag
Dienstag, 28. März 2023, 14:15–14:30, SCH A 215
Harvesting of low-grade waste heat with shape memory alloys — •Bruno Neumann1,2 and Sebastian Fähler1 — 1Helmholtz-Zentrum Dresden-Rossendorf — 2Technische Universität Dresden
More than half of all energy converted by humankind is lost in the form of waste heat. Not only does that strongly contribute to the acceleration of global warming, it also leaves an enormous economic potential untouched. However, suitable technologies are limited, since most of this heat is of low temperature (< 100 °C). In the last years, materials and technologies for thermoelectric harvesting and thermomagnetic harvesting have been explored, but a high efficiency of those systems remain a challenge. With our work, we present a thermoelastic harvesting approach for converting the waste heat of a fluid into electricity, utilizing shape memory alloy wires. These wires bring the inherit advantage that their transformation temperatures can be adapted to the required temperature range of the waste heat. Moreover, they provide a very high actuation energy density and are commercially available. In our set-up, we use two mechanically connected arrays of wires to reach a high power density of the system. Our simulation data predicts a thermodynamic efficiency in respect to the Carnot efficiency of 22.7 %, which exceeds current efficiency benchmarks set by thermoelectric materials.