Investigation and study on current situation of underground railway carriage thermal environment in summer in moderate zone

 Taking Kunming underground railway Line 1 and Line 2 as the research objects, tests the thermal environment parameters of underground railway carriages in summer. Obtains the actual thermal sensation of passengers by subjective questionnaires. Obtains the carriages thermal environment of Kunming underground railway through field investigation. Calculates the thermal neutral temperature and acceptable temperature range of passengers in heavy traffic and non-heavy traffic periods. From the point of view of health, comfort and energy saving, suggests to increase setting temperature of air conditioning in Kunming underground railway to an appropriate value. That is to say, 25 ℃ is for the heavy traffic period and 27 ℃ for the non-heavy traffic period.