In forced air systems, what is the role of the heat exchanger?

The role of the heat exchanger in forced air systems is to transfer heat. In these systems, the heat exchanger is a crucial component that facilitates the transfer of thermal energy between two fluids without them mixing. In heating applications, the heat exchanger receives heat from a combustion process (such as from gas burners) or from another heat source and transfers that heat to the air that circulates through the system. This warmed air is then distributed throughout the living space via ductwork.

In cooling applications, a heat exchanger operates in reverse, allowing heat from the air to be absorbed and dissipated outside, effectively cooling the indoor environment. This clear function of transferring heat distinguishes the heat exchanger as a vital element in maintaining desired temperatures within a forced air system.