German-Japanese researchers invent electricity-free tech that could cool datacenters
German and Japanese researchers have demonstrated a small cooling device that operates without electrical input, using waste heat to create mechanical motion and then produce a cooling effect. If it can be scaled up and improved, the approach could reduce the energy, water use and environmental impact associated with cooling datacentres and other electronics.
The Karlsruhe Institute of Technology and University of Tsukuba team used two thin nickel-titanium shape-memory foils: heat causes one to move, powering the loading and unloading of the other. Their prototype achieved a 12.9K temperature span at the refrigerant-film level and 4.0K at device level under 86°C heating; with a 130°C external heat source, it maintained a 2.2K device-level span. The technology remains at an early laboratory stage, with larger experimental systems planned.
- Heat-powered prototype demonstrated electricity-free cooling.
- Cooling effect remains modest in laboratory tests.
- Researchers aim to scale and optimise the design.
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Datacentres house the computer systems that store information and run online services. Those systems produce heat, so keeping them cool takes energy and, in some places, water; the demand for digital services has made the impact of datacentre cooling a growing concern.
The Karlsruhe Institute of Technology in Germany and the University of Tsukuba in Japan are researching a cooling method based on nickel-titanium foils, which change shape when heated. The idea is to use waste heat to drive movement that creates a cooling effect, potentially reducing the need for powered cooling equipment.
The device has so far been tested only as a small laboratory prototype. Whether it can be made larger and work efficiently in real datacentres remains to be established.
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The case for
If the prototype can be scaled and made reliable, it could turn waste heat into useful cooling without drawing electricity, potentially reducing datacentres’ energy demand, water use and environmental footprint. Supporting further research is reasonable because even incremental improvements in cooling could matter as computing demand grows, and early laboratory results offer a basis for testing the idea’s practical limits.
The case against
The reported temperature spans come from a small early-stage prototype, so they do not yet show that the system can cool datacentres effectively or economically at scale. Developing it further may require substantial engineering, and its performance will depend on access to suitable heat sources; investment and environmental claims should therefore remain cautious until larger systems are tested.