Heat Exchangers

Heat exchangers cool or heat whatever is needed to be cooled or heated. Most simple form of a heat exchanger is a heat sink where heat from a hot source such as a power transistor, chip, motor, is conducted away through contact with a highly conductive metal. For example, an aluminum or a copper plate having fins on one side and a flat surface on the other, in contact with the device being cooled. The fins on a heat sink have a large area in contact with air around them. The air can naturally flow over the fins taking the heat away, or be forced with a fan. A fan significantly increases cooling.

Liquid heat exchangers have passages drilled directly through the material being cooled, or tubes in close contact with the device. Simplest form of a liquid heat exchanger is a cold plate, where the tubes are pressed into the plate, or alternatively the plate has holes drilled through its length.