What is the main purpose of a chiller in an HVAC system?

The main purpose of a chiller in an HVAC system is to remove heat from the building. Chillers function by circulating a refrigerant, which absorbs heat from the water in the system and subsequently releases it through a condenser. This process is essential for maintaining a comfortable indoor environment, especially in larger commercial buildings where cooling loads can be significant. By effectively removing heat from the space, chillers help to lower the interior temperature, ensuring optimal conditions for occupants and protecting sensitive equipment.

The other options, while relevant to various functions within an HVAC system, do not capture the primary role of the chiller. Circulating air, providing humidity control, and filtering air contaminants are tasks typically managed by other components of the HVAC system, such as fans, dehumidifiers, and air filters, rather than by the chiller itself. Thus, the identification of the chiller's function as heat removal aligns directly with its key operational purpose.