CALYTRONICS cooling solutions are based upon LOOP HEAT PIPE (LHP) technologies. A Loop Heat Pipe is a sealed 2-phase cooling device composed of an evaporator (with integrated capillary pump), a tubed condenser and connecting lines. It contains an inner thermal working fluid thanks to which the heat transfer is done through continuing passive cycles of vaporization and condensation. It relies on 3 keys physical phenomena:

1. Capillary Pumping. Calyos evaporators contain an inner capillary pump made of a metallic foam with micron level pores. While absorbing the fluid, the foam creates a natural pressure head that makes the fluid circulates inside the loop. It allows pumping without any mechanical pump nor external energy. Calyos breakthrough manufacturing processes make pumping against gravity possible up to 3 meters.

2. Vaporization. After being pumped, the fluid fully vaporizes by absorbing the heat dissipated by the component to be cooled (the “hotsource”). Thanks to the latent heat of vaporization, high heat loads (with heat fluxes up to 100W/cm²) can be easily transferred whilst the thermal resistance is significantly reduced compared to other cooling technologies.

3. Condensation. Thanks to the pressure head, the vapour (100% vapour quality) passively flows to the condenser where it turns back into liquid (0% vapour quality) whilst the heat is released outside the Loop Heat Pipe with an external Heat Exchanger (the “coldsource”). Once fully condensed, the liquid flows back to the evaporator to start a new cycle.