Liquid cooling refers to cooling by means of the convection or

circulation Circulation may refer to: Science and technology * Atmospheric circulation, the large-scale movement of air * Circulation (physics), the path integral of the fluid velocity around a closed curve in a fluid flow field * Circulatory system, a bio ...

of a

liquid A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a (nearly) constant volume independent of pressure. As such, it is one of the four fundamental states of matter (the others being solid, gas, a ...

. Examples of liquid cooling technologies include: * Cooling by convection or circulation of coolant, including water cooling * Liquid cooling and ventilation garments, worn by astronauts * Liquid metal cooled reactors * Radiators (engine cooling) * Cooling towers

Applications

Computing

In computing and electronics, liquid cooling involves the technology that uses a special water block to conduct heat away from the processor as well as the chipset. This method can also be used in combination with other traditional cooling methods such as those that use air. The application to microelectronics is either indirect or direct. The former pertains to the category that utilizes cold plate cooling, which uses water as coolant while, in the latter (also referred to as liquid immersion cooling), the surface of the chips comes in contact with the liquid since there is no wall separating the heat source from the coolant. This immersion cooling also offer a higher transfer coefficient, although this depends on the specific coolant used and mode of convective heat transfer. One of the main benefits achieved is the reduction of noise and it is also more efficient. Some of the drawbacks include the risk entailed with the close proximity of liquid to electronics as well as its cost. Liquid cooling systems are more expensive than fan sets, which require less components such as reservoir, pump, water blocks, hose, and

radiator Radiators are heat exchangers used to transfer thermal energy from one medium to another for the purpose of cooling and heating. The majority of radiators are constructed to function in cars, buildings, and electronics. A radiator is always a ...

HVAC

Liquid cooling is also used to remove heat from large buildings by using

chillers A chiller is a machine that removes heat from a liquid coolant via a vapor-compression, adsorption refrigeration, or absorption refrigeration cycles. This liquid can then be circulated through a heat exchanger to cool equipment, or another pro ...

which transfer the coolant from the evaporator to air handling units, chilled beams and fan coil units inside the building, and to the cooling towers from the condenser if the condenser is liquid-cooled. Some buildings are directly cooled by the cooling towers using plate heat exchangers transferring the heat from the chiller condenser loop to the evaporator loop. Convective heat transfer is used to cool the coolant if the building uses dry or closed-circuit cooling towers.

References

{{Tech-stub broad-concept articles Cooling technology