Liquid of cooling

The liquid of cooling is a liquid used in a closed circuit with an aim of evacuating Calorie S created in the form of heat. Generally, it is about Eau with an additive like the ethylene glycol making it possible to increase the Boiling point and/or to increase its frost resistance. These often essential additives harm sometimes the heat-storage capacities of the fluid.

The liquid of cooling presents an effective solution to a recurring problem as well in mechanics as in electronics: the indésirée creation of heat which can damage the system.

Principle of operation

Typically, the liquid follows a course closed, through the part which one wants to dissipate heat (heat is collected), then through the part of the circuit which is used for cooling (energy is dissipated). At the time of its passage in the zone to be cooled, the liquid must pass:

with nearest to the source of heat
with the best distribution around (them) the source (S)
with the most contact possible with the part to cool

The evacuation of the calories can be done by a simple tank of liquid whose mass is sufficiently important not to undergo increase in too important heat and thus remains with room temperature. But it can also be done by the passage of the liquid in a wasteful element offering the maximum of contact to the air or any other ambient conditions, it act of an exchanger. If one of the two fluids of the exchanger is air, the installation of a forced circulation (a ventilator) makes it possible to increase the capacities of exchange and thus of cooling.

The circulation of the liquid in the circuit can be made (the hot liquid naturally causes overpressure: it is said whereas there is natural convection); but, in general, it is forced via a Pompe or by the phenomenon of Thermosiphon. The central heating with warm water uses the same principle.

Contexts of use

The most popular case of the use of the name of liquid of cooling is the Thermal engine. In this case, Alésage S in Chicane S of weak dimensions (for a maximum of contact) are carried out in a regular way around the cylinders. These borings are then connected to the circuit so as to place the zone of cooling nearest possible to the exit of the zone has to cool.

One however uses this technique in many of other contexts, in mechanics as in electronics, for example for some Processeur S data processing, such as for example for the PowerMac G5.

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