Elastic Alloy: 20x Temp Change & 90% Heat Pump Efficiency
- A novel elastic alloy, Ti78Nb22, developed at the Hong Kong University of Science and Technology (HKUST), promises a important leap in solid-state heat pumping efficiency.
- The study, published in Nature Communications, highlights the alloy's potential as a green alternative to conventional vapor-compression technologies.
- Professor Sun Qingping's team at HKUST is tackling this challenge by harnessing the thermoelastic effect (tee), where elastic deformation generates heat.
Witness a groundbreaking leap in energy efficiency: HKUST’s newly developed elastic alloy, Ti78Nb22, is revolutionizing heat pumping. This innovative material exhibits a remarkable 20 times greater temperature change than conventional metals. Approaching 90% of Carnot efficiency, this breakthrough offers a powerful green alternative to customary cooling methods. The thermoelastic effect, harnessed by Professor sun Qingping’s team, presents a sustainable solution to replace fossil fuel-based heating systems. News Directory 3 recognizes this as a pivotal advancement in solid-state heat pump technology, capable of transforming industrial applications. Discover how ferroelastic alloys could further amplify these gains, potentially reaching an unprecedented 22K temperature change.Explore the future of eco-friendly heat supply.
HKUST Alloy Revolutionizes Heat Pumping with 20x Efficiency Boost
Updated May 26, 2025
A novel elastic alloy, Ti78Nb22, developed at the Hong Kong University of Science and Technology (HKUST), promises a important leap in solid-state heat pumping efficiency. The material exhibits a reversible temperature change 20 times greater than traditional metals when stretched or compressed, according to the university.
The study, published in Nature Communications, highlights the alloy’s potential as a green alternative to conventional vapor-compression technologies. Currently, fossil fuels supply most global heating demands, contributing to greenhouse gas emissions. Solid-state heat pumps offer a more environmentally amiable solution, but their energy efficiency has remained a challenge.
Professor Sun Qingping’s team at HKUST is tackling this challenge by harnessing the thermoelastic effect (tee), where elastic deformation generates heat. while scientists have known about TeE since the 19th century, it was previously considered too weak for practical use. The team’s [100]-textured Ti78Nb22 martensitic polycrystal, however, displays a temperature change of 4–5 K under linear elastic deformation, far exceeding the 0.2 K change seen in conventional metals.
The alloy achieves approximately 90% of the Carnot efficiency limit in heat pumping, rivaling refrigerants in commercial vapor-compression systems. Further research suggests that certain ferroelastic alloys could achieve even greater temperature changes, potentially reaching 22 K. This innovation offers a non-phase-transition-based solution for eco-friendly, high-efficiency heat supply.
This discovery changes the long-standing and well-established perception that the thermoelastic effect is too weak to be useful. Our research demonstrates that linear elastic deformation alone can be used for highly energy-efficient heat pumping.
As global decarbonization efforts intensify, this technology provides a transformative solution for replacing fossil fuel-based heating. We are currently developing prototype heat pumps using the alloy for industrial applications.
What’s next
The researchers are now focused on developing prototype heat pumps utilizing the new alloy for various industrial applications, aiming to replace fossil fuel-based heating systems with a more sustainable and efficient alternative.