Field Study On Indoor Thermal Environment In Winter For Subway Carriage

With the development of economy,The subway is developing rapidly in all large and medium-sized cities, and become an ideal choice for a short travel. The thermal comfort of subway carriage also get more and more attention. For a comprehensive analysis of the thermal comfort of subway carriage in winter, this paper chooses the subway in Shenyang(in sereve cold zone), Beijing(in cold zone), Shanghai(in hot summer and cold winter zone), Guangzhou(hot summer and warm winter zone) as field research object to analyze thermal environment and thermal comfort of passengers in subway carriage and provide theoretical basis for adjusting thermal environment and providing thermal comfort level of passengers in winter.In this paper, we use the method of questionnaire survey and field study of the thermal environment parameters. The thermal environment of each city is analyzed. And the thermal environment and thermal sensation of the passengers in ground lines were compared with that in the underground lines in Beijing, Shanghai and Guangzhou. At the same temperature, the difference of the thermal sensation among different cities is also discussed. Obtains the thermal neutral temperature, thermal expected temperature and temperature range accepted by 80% passengers in the subway carriage of each city. The results show that the predicted thermal neutral temperatures are higher than the actual thermal neutral temperature, the thermal expected temperature are all lower than the thermal neutral temperatures, the lower limit of the thermal acceptance range of Shenyang and Beijing is lower than that of Shanghai and Guangzhou. In this paper, the reasons of the above results are analyzed and compared with the results of the thermal comfort in residential and public buildings.Fuzzy comprehensive evaluation model for the thermal comfort of subway carriage in winter is build by using fuzzy mathematics. Determine the factors set u = {air temperature, clothing thermal resistance, relative humidity}, the evaluation set V={TSV=-1,0, +l}, and are seeking out the membership function of air temperature, clothing thermal resistance, air humidity on the thermal comfort level. Application of Analytic Hierarchy Process to obtain the weight of the air temperature, thermal resistance and relative humidity is 0.620, 0.283 and 0.097 respectively. So the weight set C ??0.620 0.283 0.097?, and the fuzzy comprehensive evaluation model of the thermal comfort of the subway carriage in winter is established in the end.