地铁设备用房通风空调系统最优切换温度研究
Optimal switching temperature of ventilation and air conditioning systems in underground railway equipment rooms
摘要：
地铁设备用房通风空调系统可实现3种工况运行，合理地进行工况切换是实现节能运行的前提。通风/空调工况通过比较室外空气干球温度与工况切换温度进行选择。以实际地铁工程项目为例，利用MATLAB软件进行数值计算，通过比较不同工况切换温度下通风空调系统的全年总能耗，发现工况切换温度存在最优值。同时，最优工况切换温度随风管系统阻力、风机最低运行频率、冷水机组制冷性能系数的增大而减小，且受气候条件的影响，在本文的算例中，武汉和郑州的最优工况切换温度为17 ℃，广州为14 ℃。
Abstract：
The ventilation and air conditioning system in underground railway equipment rooms can be operated under three conditions, and the reasonable switching of conditions is the prerequisite for realizing energy saving operation. The switching between the ventilation condition and the air conditioning condition is obtained by comparing the outdoor air dry-bulb temperature with the condition switching temperature. Taking an actual underground railway engineering project as an example, uses the MATLAB software to perform numerical calculations. By comparing the total annual energy consumption of the ventilation and air conditioning system under different condition switching temperatures, finds that there is an optimal value for the condition switching temperature. At the same time, the optimal condition switching temperature decreases with the increase of the resistance of air duct systems, the minimum operating frequency of fans and the coefficient of performance of chillers, and is affected by the climatic conditions. In the calculation example, the optimal condition switching temperature is 17 ℃ in Wuhan and Zhengzhou, and 14 ℃ in Guangzhou.
Keywords:ventilation and air conditioning system, energy saving, optimal condition switching temperature, ventilation condition, air conditioning condition, underground railway