Which of the following components is NOT part of a commercial air conditioning system?

In a commercial air conditioning system, the primary components designed to manage air temperature and quality include the compressor, condenser, and evaporator. Each of these components plays a crucial role in the refrigeration cycle.

The compressor is responsible for circulating the refrigerant through the system, raising its pressure and temperature as it compresses gas into a liquid. The condenser then cools this high-pressure gas, allowing it to release heat and transition back into a liquid state. Finally, the evaporator serves as the point where the refrigerant absorbs heat from the indoor environment, resulting in a cooling effect.

While a humidity sensor is a valuable tool for monitoring and controlling indoor air quality, it is not classified as a core component of the system itself. Rather, it serves as an auxiliary device that can enhance comfort and efficiency by providing feedback to the system about moisture levels, helping to regulate humidity. However, it does not directly participate in the primary cooling process, which is why it is not considered an essential element of the air conditioning system.

This distinction emphasizes the difference between functional components necessary for the cooling cycle and ancillary instruments that assist in maintaining overall air quality and comfort.