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Two-phase flow heat transfer is at the core of our passive cooling solutions for high-power electronics. By harnessing phase change in carefully selected working fluids, we remove large heat loads from AI and HPC processors, telecom equipment, aerospace systems and power electronics with minimal energy consumption.
When undergoing phase change (from liquid to vapour or vice versa), fluids have the ability to exchange significant amounts of energy. This is mostly due to the fluid's latent heat and the flow’s high heat transfer coefficient, here illustrated for various types of flow. This makes two-phase cooling the best alternative for cooling of high heat flux applications.
Two-phase heat transfer coefficients increase with local heat flux, offering a passive optimal hotspot cooling solution.
Refrigerants typically used in such cooling systems have great dielectric properties, increasing operational safety, and their Global Warming Potential has systematically decreased in the last few decades.
Our mission is to work with clients and partners in the development and integration of disruptive, green and financially competitive cooling systems into the market.
Our solution? Passive two-phase cooling!
Passive two-phase cooling refers to the cooling of components using a working fluid that undergoes phase change and has self-sustained motion driven by the application/extraction of heat. We specialize in innovative technologies, including Pulsating Heat Pipes (PHP) and Loop Thermosyphon Systems (LTS).
Passive two-phase cooling offers a unique combination of high heat transfer performance, low energy use and excellent reliability compared to conventional air or liquid cooling.
From a few watts to megawatts, passive two-phase cooling can scale efficiently while maintaining low component temperatures (<90°C for most applications). It is especially relevant for high heat-flux electronics (>10 W/cm²), where standard heat spreaders or air-cooled solutions reach their limits. Typical use cases include CPUs in 1U and 2U servers, AI and HPC accelerators, telecom and 5G equipment, aerospace, automotive and power electronics.
EPFL Innovation Park
Building A
CH-1015 Lausanne
Switzerland
Email: info@jjcooling.com
Phone: +41 21 566 10 79
