Study on Indoor Environment in Air-conditioned Trains

Indoor air quality (IAQ) is the problem that people increasingly pay attention to. With the development of Chinese railway undertaking, air-conditioned train is developing to the direction of higher speed and more comfortable. However, in China, people pay more attention to the temperature and the relative humidity in train compartments, but do not care for IAQ, so it leads to poor IAQ in train compartments. This paper has investigated IAQ in train compartments in the form of questionnaire, and analyzed the result in different types of train compartments, with different load factor, different outdoor environmental parameters, different train speed, and windows opened or not. At last, we come to the conclusion that fresh air is the main factor that affects indoor environment. We put forward some measures to improve indoor environment in train compartments.