Cool Kitchen: Processing Starch and Eggshell Powder into Sustainable Coatings for Passive Daytime Cooling

Titelangaben

Song, Qimeng ; Kubacki, Evelyn ; Berger, Alexander ; Retsch, Markus:
Cool Kitchen: Processing Starch and Eggshell Powder into Sustainable Coatings for Passive Daytime Cooling.
In: Advanced Functional Material. (2025) . - e13897.
ISSN 1616-301X
DOI der Verlagsversion: https://doi.org/10.1002/adfm.202513897

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Abstract

Increasingly frequent and severe heat waves pose a significant threat to human health, intensifying the demand for cooling solutions. Conventional air conditioning offers reliefbut escalates energy consumption and CO2 emissions, exacerbating global warming. Here, a passive daytime cooling composite made from kitchen-sourced materials, providing a zero-energy cooling technology accessible to everyone, is introduced. Composed ofstarch and finely ground eggshell powder, this eco-friendly composite demonstrates an average solar reflectance of0.91 and thermal emissivity of0.95. Applied to concrete, it achieves a temperature reduction ofapproximately 15 °C compared to uncoated concrete under 800 Wm−2 solar irradiation. With universally accessible ingredients and a simple fabrication process, this cooling composite provides a viable solution for households with limited infrastructure to tackle the growing threat ofheat waves.