标题:
捷运电联车车厢内空调系统对温度流场变化之分析Analysis of EMU Air Conditioning System inside the Temperature Profile of the Flow Field
作者:
李嘉塗, 黄志宏, 余汶龍
关键字:
温度流场, CFD, 适温标准, 舒适感Temperature Flow Field; CFD; Optimum Temperature Standards; Feeling of Comfort
期刊名称:
《Modeling and Simulation》, Vol.1 No.1, 2012-08-30
摘要:
随着经济日渐富裕与发展观光的需求，未来可以期待对大众运输捷运系统的需求愈益明显。旅客对交通服务的需求是安全、快速与舒适。因此，本研究目标能让旅客在搭乘过程中享有舒适体感，提升服务满意。本研究采用CFD软件，仿真捷运电联车车厢内空调系统，温度动能的变化情形。冷气送风口(inlet)设为2个，出口(outlet)设为4个；风速设定范围为0.1 m/s、0.2 m/s、0.3 m/s、0.4 m/s，电联车体温度设为30℃、38℃；空调温度的设定为22℃、25℃，人体最佳舒适标准，温度设定为28℃(301 K)。经过多次尝试，模拟结果如下：1) 离送风口越近，温度越低，低温由送风口经车厢中间再向两侧扩散，形成车厢中间较低温，两侧较高温的温度流场；2) 在同一风速下，温度设定越低，较低温的温度流场面积会缩小，温度流场的等温线会越密集；3) 车厢内温度变化直接影响车内旅客的舒适感，等温梯度越平稳，舒适感越高。由模拟实验的结果得知，加大风速，可加快降低温度的时间，扩散较为良好，不用调低温度设定，较为省电。
With the development in economy, urban public transportation tends to pay attention to be safer, faster, more stable, coupled with the increasing importance in global environmental awareness; EMU car is comfortable or not will have a significant impact on passengers’ travel, especially on commuters’. The objective of this study is not only make the process of car passengers enjoy a comfortable ride journey, but also improving the EMU energy efficiency of air conditioning systems. This study uses CFD software to simulate the EMU car’s air conditioning system, the temperature variations of kinetic energy. Air-conditioning outlet (inlet) is set to 2, and exports (outlet) is set to 4; air velocity range of 0.1 m/s, 0.2 m/s, 0.3 m/s, 0.4 m/s, ITU body temperature set to 30˚C, 38˚C; air conditioning temperature setting is 22˚C, 25˚C, the human body the best standards of comfort, the temperature set to 28˚C (301 K). The simulation results show that: 1) The lower temperature location is near air conditioning outflow system. The higher temperature is on both sides of the EMU; 2) At the same wind speed, when the temperature profile is setting lower, the contours of the flow field is more intensive; 3) Inside temperature changes directly affect the comfort of the passengers in the car more stable temperature gradient, the higher the comfort. The simulation results show that increasing the wind speed can reduce the temperature and speed up the time to let it more efficiency, not decreasing the temperature setting.