Crystallization by local cooling of supercooled sodium acetate trihydrate composites for long-term heat storage

Abstract

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Demonstration of a solar combi-system utilizing stable supercooling of sodium acetate trihydrate for heat storage

“…After melting and heating SAT in a closed container with smooth inner surfaces to a temperature above 77 °C and by avoiding pressure changes in the container, sensible heat can be discharged until room temperature is reached [28]. Then, the crystallization of the supercooled solution can be initiated by seed crystal injection [29,30] or by local cooling [31], and the heat of fusion will be released as it crystalizes. This heat storage concept dates back to initial research in the late 1920s [32] and was later found to enable more efficient solar heat supply of low-energy buildings in summer and transitional seasons [33].…”

Sustainable enhancement of district heating and cooling configurations by combining thermal energy storage and life cycle assessment

“…SAT has a melting point of 58 ºC, relatively high melting enthalpy at 264 kJ/kg (Dannemand et al 2015), and within its operation temperature, density is between 1.25 kg/m 3 and 1.45 kg/m 3 (Dannemand et al 2018). Also, SAT presents stable supercooling, and therefore, generally reliable mechanisms are required for the controlled initialization of crystallization (Englmair et al 2018a).…”

Patterned crystal growth and heat wave generation in hydrogels

“…21 Supercooled phase change materials have found applications as triggerable heat sources in the context of portable hand heating, 22 cold-start automotive engine heating, 23 building-scale air and water heating, 24 and long-term solar energy storage. 25 These applications are mostly intended to raise temperatures in a bulk volume for human comfort or improved device function; accordingly, the spatial and temporal evolution of the thermal profiles produced by triggerable phase change materials have rarely been engineered beyond the shape of the reservoir.…”