Calyos, a company based in Jumet, Belgium, is setting its sights on solving one of the most critical challenges facing the digital economy: efficient data center cooling. Leveraging a proven technology initially developed for the rigors of space at Euro Heat Pipe (from which it was spun off years ago to pursue opportunities in non-space industries), the company has embarked on the 2PC4DC (Two Phase Cooling for Data Centre) project to accelerate the deployment of its advanced cooling systems in the terrestrial computing market.
The foundation of Calyos’s offering is two-phase cooling technology; specifically, the Loop Heat Pipe (LHP) system, which was originally conceived for thermal management of critical components in satellites. In the vacuum of space, where traditional convection is impossible, engineers utilized phase change to manage heat loads.
Testing of a Loop Heat Pipe prototype
The LHP principle is inherently efficient and boasts powerful advantages over current solutions. It achieves heat transfer by vaporizing a pure liquid using a capillary wick and condensing the vapor to return the liquid, making it a 100% passive loop that operates without a pump. This passive design enables high heat densities (demonstrated at over 200W/cm²) and long-distance heat transfer, positioning it as a highly sustainable and maintenance-free solution.
Calyos’ CEO Antoine de Ryckel commented: “We use the problem as a solution. Instead of fighting heat, we work with it. That’s our strength.”
The company has expanded its expertise in two-phase technologies by developing multiple solutions beyond LHP for various sectors( mobility, energy, computing,…). Among these, the data center market has been identified as one of the most promising applications for Calyos’ LHP and other products.With the exponential growth of computing power, particularly for AI applications, traditional air-cooling and even single-phase liquid cooling methods are nearing their thermal limits.
Industry analysts and experts forecast that the rise in total dissipated power for chips will drive the transition from single-phase to two-phase cooling much sooner than the earli er transition from air to liquid cooling.
Recent announcements by Nvidia at CES 2026 only confirm this intuition.
While the final end-users include hyperscale data centers, co-location providers, and enterprise IT operators, Calyos’s strategy is to partner with solution providers who will integrate and deploy the technology in the short term future.
Interior view of the Calyos production facility
To realize this market potential, Calyos is developing a proof of concept and maturing its business case, aiming to commercialize its solution for high-performance, cost-effective, and sustainable cooling system for the next generation of data centers by 2027 at the latest. The company has received a Seal of Excellence from the European Commission for its liquid rack cooling solution.
The team, which includes CEO Antoine de Ryckel, Founder and experienced business developer Olivier de Laet, and Project Manager Diogo Soveral, is composed of experts in two-phase technology and the data center industry.
