The Graz University of Technology has presented a prototype of ceramic cubes manufactured with 3D printing that reduce the temperature of a room by up to 7 degrees. The system uses only water and evaporation, without electricity. For citizens, this opens the door to an economical and ecological method to combat heat in homes and offices, reducing dependence on air conditioning and energy expenditure.
The science of clay: how passive cooling works 🧊
The principle is simple: the cubes, made of porous ceramic, absorb water and release it gradually through their surfaces. As it evaporates, the liquid extracts heat from the environment, achieving a notable thermal drop. The researchers tested various geometries and densities until they found a shape that maximizes the contact surface without losing structural strength. The current prototype works in small spaces with natural ventilation. Tests are still pending to scale the system to entire homes, but the initial results point to a viable solution for dry and warm climates.
Goodbye to air conditioning: now you just need to water the cubes 💧
While some spend fortunes on climate control equipment and terrifying electricity bills, these cubes ask for a simple bucket of water and patience. That said, don't expect them to cool a sauna or a terrace during a full Andalusian heatwave. If you live in a humid place, the invention becomes a nice paperweight. But for those who suffer the sun head-on, maybe it's time to get back to basics: clay, water, and knowing how to wait for nature to do its job.