During the operation of a subway system, the environmental control system is essential to provide a comfortable environment. However, its energy consumption accounts for approximately 40% of the total energy usage of the subway.

The control system in the station adopts energy-saving measures. Compared to other lines, this station experiences larger passenger flows, which results in greater fluctuations in the air conditioning load. Only automatic control technology can effectively achieve energy savings in this scenario. In recent years, automatic control technology has been increasingly applied to various air conditioning systems, and environmental sensors, as indispensable components of these systems, play a crucial role in the subway environment. In the environmental control system of the Beijing Daxing Airport Line, indoor temperature and humidity sensors, duct temperature and humidity sensors, and CO2 concentration sensors are used.

The indoor temperature and humidity sensors monitor the real-time temperature and humidity inside the station. This data helps subway operators adjust various systems to ensure a comfortable environment for passengers and to maintain the proper working temperature for equipment and instruments. The indoor temperature and humidity sensors are installed in the station hall, platform, and equipment rooms as needed.

The duct temperature and humidity sensors monitor the outdoor fresh air as well as the temperature and humidity inside the station. The environmental control system collects data from these sensors to assess the quality of the station's environment. Based on this data, the system can adjust its operations to achieve intelligent, automated control of the station's environment while also ensuring energy efficiency and environmental sustainability.