Two-Phase Mini-Thermosyphon Electronics Cooling, Part 2: Model and Steady-State Validations

In the present study, a simulation code specifically developed to evaluate the thermal-hydraulic performance of thermosyphon cooling loops is validated through the experimental results obtained in the Part 1. It considers levels of heat load conventionally observed in real servers of datacenters, which means idle, normal and maximum clock speed of actual microprocessors. The thermosyphon is a very compact unit with a height of 15 cm and capable of safely operating up to a heat flux of 80 W cm(-2). The loop basically is comprised of a riser, a downcomer, a micro-evaporator and a counter flow tube-in-tube condenser. The latter is cooled by cold water whose mass flow rate can be controlled through an external pump (speed control), so that parameters such as saturation temperature and/or condenser outlet subcooling can be adjusted for a pre-defined set point, and thus increasing the range of operability of the cooling loop. Other parameters were also explored experimentally, cooling looping overall performance, chip (junction) temperature, whilst the critical heat flux was estimated from a leading CHF method. Finally, the study showed that the passive two-phase closed loop thermosyphon cooling system is a safe and energetically viable technology solution for the next generation of datacenters.

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John Richard Thome, Jackson Braz Marcinichen, Nicolas Lamaison, Chin Lee Ong
2016
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https://infoscience.epfl.ch/record/225250?ln=fr

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Concepts associés (6)

Heat flux

In physics and engineering, heat flux or thermal flux, sometimes also referred to as heat flux density, heat-flow density or heat flow rate intensity, is a flow of energy per unit area per unit time. Its SI units are watts per square metre (W/m2). It has both a direction and a magnitude, and so it is a vector quantity. To define the heat flux at a certain point in space, one takes the limiting case where the size of the surface becomes infinitesimally small.

Capteur de flux thermique

vignette|273x273px|Exemple d'un capteur de flux thermique, HFP01. Ce capteur est généralement utilisé dans la mesure de la résistance thermique et du flux de chaleur sur les enveloppes de construction (murs, toits). De plus, ce type de capteur peut être creusé pour mesurer le flux de chaleur du sol. Diamètre 80 mm Un capteur de flux thermique (anglais: Heat Flux Sensor, allemande: Wärmeflusssensor) est un nom ordinairement utilisé pour un transducteur produisant un signal proportionnel au flux thermique local.

Critical heat flux

In the study of heat transfer, critical heat flux (CHF) is the heat flux at which boiling ceases to be an effective form of transferring heat from a solid surface to a liquid. Boiling systems are those in which liquid coolant absorbs energy from a heated solid surface and undergoes a change in phase. In flow boiling systems, the saturated fluid progresses through a series of flow regimes as vapor quality is increased. In systems that utilize boiling, the heat transfer rate is significantly higher than if the fluid were a single phase (i.