3D-Printed Ceramic Cubes Offer Passive Cooling Solution
Researchers have developed 3D-printed porous ceramic cubes that utilize evaporative cooling to combat urban heat. These cubes can significantly reduce ambient temperatures and are being explored with sustainable materials.
In response to rising global temperatures and increasing heat waves, researchers at the Institute of Architecture and Media at Graz University of Technology (TU Graz) have introduced an energy-efficient method for mitigating urban heat island effects. The solution involves 3D-printed cubes made from highly porous ceramics, integrating ancient passive cooling techniques with advanced additive manufacturing. These ceramic cubes are designed to cool both indoor environments and outdoor air.
The cooling mechanism employed by the cubes relies on evaporative cooling, a principle well-known in arid regions. By allowing water to evaporate, heat is absorbed from the surroundings, thereby cooling the air. Milena Stavric from TU Graz explained that while this principle has been used for centuries in objects like clay jugs, the innovation lies in 3D printing. This technology allows for the creation of complex, porous geometries from clay mixtures that optimize water storage and maximize the evaporation surface area relative to the cube's volume.
Each cube, measuring approximately 23 centimeters on a side, is digitally designed and then 3D-printed using a ceramic clay mixture. Following printing, the objects are fired at low temperatures to achieve a highly porous structure. The internal design utilizes a specially developed minimal-surface geometry (TPMS) to create a large surface area with minimal material usage. Water is drawn into the porous ceramic via capillary action and distributed throughout the intricate internal structure, facilitating continuous evaporation and heat absorption from the environment.
To further enhance cooling efficiency, the research team is investigating bio-inspired approaches. They are incorporating fungal cultures and sawdust into the clay mixture, which serve as a nutrient medium for mycelium, the root-like network of fungi. When this clay-fungus mixture is 3D-printed and fired, the mycelium and sawdust burn away, leaving behind a network of micro- and macro-pores that improve water distribution within the cube. A field test conducted in a warm attic at TU Graz demonstrated a significant cooling effect, with a temperature drop of nearly 7°C measured in the vicinity of a water-filled cube.
The team is also exploring new material blends, including sediment dredged from Lake Neusiedl. This sediment, typically disposed of, could potentially be incorporated into 3D-printed construction materials, offering a sustainable and resource-efficient alternative to conventional cooling systems. These ceramic walls are envisioned for use in buildings, schools, public spaces, and waiting areas, aiming to provide cooling in areas most affected by heat, such as dense urban environments, by leveraging natural cooling principles instead of energy-intensive air conditioning.
This development showcases additive manufacturing's potential in sustainable building materials and passive climate control. By leveraging 3D printing to create complex, porous ceramic geometries optimized for evaporative cooling, researchers are offering an energy-efficient alternative to traditional air conditioning. The exploration of recycled materials like lake sediment further highlights AM's role in resource efficiency and circular economy principles within construction.
Edited by the news editor with AI from the original report — please refer to the original source.