What does the term “chiller” refer to in HVAC systems?

The term “chiller” in HVAC systems specifically refers to a machine designed to remove heat from a liquid, typically water, through processes such as vapor compression or absorption refrigeration cycles. This function is crucial for cooling purposes, as chillers are commonly used in large commercial buildings to provide chilled water for air conditioning systems. By extracting heat from the liquid, chillers help maintain comfortable indoor temperatures, especially in climate-controlled environments.

In the context of HVAC systems, understanding the role of chillers is essential as they not only contribute to climate control but also impact energy efficiency and overall system performance. Unlike devices used for humidification or those that circulate hot air, which serve different roles in heating and air quality management, chillers have a specific focus on cooling through heat removal. Similarly, air filters, while important for maintaining air quality, do not serve the cooling function that chillers are designed for. This makes option B the accurate description of what a chiller is in the context of HVAC systems.