Passive Two-Phase Cooling

Advanced passive two-phase cooling systems including loop thermosyphons, pulsating heat pipes and CoolRacks for high-power electronics.

Unlock your electronics' potential

NEWS

Shift2DC Researchers Among the World’s Top 2% Scientists (Stanford Elsevier 2025)

Shift2DC researchers have once more been listed among the world’s leading scientists, according to the 2025 edition of “Stanford World’s Top 2% Scientists”. This year’s list includes: Andrii Chub and Dmitri Vinnikov (Taltech), Salvador Ceballos (Tecnalia), John Thome (JJ Cooling) and Hugo Morais (INESC ID).

JJ Cooling Innovation provides passive two-phase cooling solutions for high-power electronics in AI, HPC and 5G applications. We design and validate loop thermosyphons, pulsating heat pipes and compact refrigeration systems to improve reliability, energy efficiency and thermal performance.

Empowering the AI, HPC and 5G markets, we lead with cutting-edge technology and consulting services for high-power electronics cooling systems. Our solutions drive efficiency, sustainability and reliability, ensuring peak performance in rapidly evolving landscapes.

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Liquid Cooling Solutions for High-Power CPUs

JJ Cooling Innovation develops advanced two-phase liquid cooling systems for high-power CPUs and data-center electronics. Our loop thermosyphons and pulsating heat pipes provide energy-efficient liquid cooling performance without pumps or moving parts—ideal for AI, HPC and next-generation computing applications.

Passive Cooling with No Moving Parts

We propose passive solutions to meet your cooling needs, by relying on naturally occuring phenomena.

CONDENSER

Riser

Loop thermosyphon passive cooling system for servers and racks

Downcomer

Evaporator

Loop Thermosyphon (LTS)

Gravity-driven passive cooling for high-power electronics
Requires elevation between evaporator and condenser
Ideal for cooling AI / HPC servers and racks, batteries, power electronics and avionics

Condenser

Pulsating heat pipe passive cooling for portable electronics and batteries

Evaporator

Pulsating Heat Pipes (PHP)

Passive two-phase cooling using self-induced flow from pressure fluctuations
Works in any orientation: micro-gravity, hyper-gravity and standard conditions
Suitable for portable electronics, batteries, avionics and compact thermal management

Interested in compact refrigeration cooling solutions ?

We also have extensive experience with vapor compression systems

CONDENSER

Expansion device

Animation showing the working principle of refrigeration cooling systems.

Compressor

Evaporator

Compact Refrigeration Systems for Electronics Cooling

Mechanically-driven cooling using vapor compression
Requires electrical input; suitable when passive cooling alone is insufficient
Applications include HVAC&R, air (de)humidification and precise temperature control of electronics

Simulate and optimize before prototyping

Our in-house simulation tools model two-phase flow, loop thermosyphons and pulsating heat pipes to optimize thermal design before prototyping. This shortens development cycles and reduces testing costs.

Test, analyse and validate

Our laboratory is equipped to characterize passive cooling systems from prototype to final product. We measure thermal performance, pressure drops and reliability to validate your electronics cooling solution against real operating conditions.