What is the main purpose of a heat exchanger in HVAC systems?

The primary function of a heat exchanger in HVAC systems is to transfer heat between two or more fluids without allowing them to mix. This is crucial in various applications, such as heating, cooling, and refrigeration systems. In a heating system, for instance, the heat exchanger allows hot air or water to transfer heat to the air within a building, providing warmth. In cooling applications, the heat exchanger facilitates the removal of heat from the indoor environment, making spaces more comfortable.

This efficient transfer of heat enables the HVAC system to regulate temperature effectively while conserving energy. Heat exchangers can be found in different configurations, including plate, shell-and-tube, and finned-tube designs, each tailored to meet specific operational needs.

The other options do not align with the primary function of heat exchangers. While filtering air is crucial for indoor air quality, it is handled by air filters. Circulating refrigerant is a task performed by the compressor and other components within the refrigeration cycle, and measuring pressure is the job of pressure sensors, not heat exchangers. Thus, the essential role of transferring heat is what distinguishes heat exchangers in HVAC systems.