How does a heat exchanger perform heat exchange?

Heat Exchanger Heat exchange systems usually perform heat exchange in two ways: heat conduction and convection. Heat conduction is a common process of heat transfer in which there is no relative displacement between parts of the fluid; heat exchanger convection is a heat transfer process caused by the relative displacement of the particles of each part of the fluid. Heat exchanger convection is divided into forced convection and natural convection. Forced convection uses mechanical energy (such as stirring) to make the fluid convect and transfer heat.