What is the primary function of a heat exchanger in an HVAC system?

The primary function of a heat exchanger in an HVAC system is to transfer heat between two or more fluids without mixing them. This process is crucial for temperature regulation within a building. In HVAC applications, heat exchangers are used to either cool or heat the air or water within the system by efficiently transferring thermal energy. For example, in a heating system, hot water might flow through the heat exchanger, transferring heat to the air that is then distributed throughout the space. This enables systems to maintain comfortable indoor temperatures while utilizing energy efficiently.

In contrast, increasing airflow, cooling air with refrigerants, and circulating air, while important for overall HVAC function, are not the primary roles of a heat exchanger. Increasing airflow typically involves fans or blowers, cooling air with refrigerants is a function of the evaporator coil in a refrigeration cycle, and circulating air is related to ductwork and fan systems. The heat exchanger's specific role in heat transfer makes it essential for the effective operation of heating and cooling processes in HVAC systems.