Energy saving adaptability analysis of underground railway station ventilation and air conditioning control modes with stable supply air temperature

Aiming at the problem of air and water coordinated regulation during the operation of large and small air conditioning systems in underground railway stations, through the analysis of the heat exchanging process between the water side and the air side of the modular air handling unit, proposes the variable air volume operation and constant air volume operation control scheme: when in variable air volume operation mode, stabilizes the supply air temperature and adjusts the air volume to match the change of the dynamic load, when in constant air volume operation mode, taking the stable return air temperature as a target, adjusts the water volume to control stably the heat transfer. The scheme can confirm the design parameters in the field equipment, achieve timely and appropriate amount in the actual operation process, and completely eliminate the phenomenon of small temperature difference, which provides a means to improve the cooling efficiency and realize combined cooling supply of multiple stations.