Research on Energy-saving Control Technology and Energy-saving Effect Verification of Central Air Conditioning System in Subway Station

The energy consumption of subway ventilation and air conditioning system constitutes a significant portion of the total energy consumption in subway operations. Achieving energy savings in air conditioning system is a crucial measure for the subway industry to reach the strategic goal of "dual carbon" (carbon peaking and carbon neutrality). Due to the special functional requirements of the subway station, the cooling load varies significantly and is typically lower than the design cooling load due to fluctuations in passenger flow. An energy-saving control system adjusts the system's operating parameters in real time based on terminal load demands, ensuring efficient operation under both full load and partial load conditions. This paper proposes an energy-saving control strategy aiming at improving the overall energy efficiency of the system, and verifies the energy-saving effect of the main optimization control strategy of the central air conditioning system of a typical subway station based on the actual running data during the energy-saving rate test. The results indicate that the energy-saving control system for the central air conditioning system in subway stations can achieve a high energy-saving rate while meeting indoor temperature requirements. Specifically, the frequency conversion of air handling unit fans, optimization of water chiller operating parameters, and the frequency conversion of cooling water pumps and chilled water pumps contribute significantly to energy savings.