Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 30, 2016 - December 02, 2016
In this study, the relation between the thermal environment and thermal comfort of passengers in a main line vehicle in summer was investigated. At first, to understand the characteristics of the thermal environment in a main line vehicle, a field survey was conducted by measuring the temperature and humidity in regular passenger services from the morning to the night. The observation range of the temperature was from 23℃ to 28℃, and that of the humidity was from 38%rh to 68%rh. Then, to obtain the fundamental data about the passengers’ thermal comfort, a subjective experiment in which 44 subjects in total participated was carried out. The subjects rode a main line vehicle stationed at a rolling stock center, and they experienced the temperature changing approximately in the observation range in the field survey and answered questionnaires about their thermal comfort. Furthermore, the relationships between the thermal indices called PMV/PPD and the subjective evaluation values were analyzed. As a result, it was indicated that the error of the PPD in predicting the percentage of dissatisfied subjects became large in the range PMV>0, where the effect of the sweat sensation became significant. However, the PPD agreed well with the actual percentage of people who reported feeling ‘slightly cold’, ‘cold’ or ‘slightly hot’, ‘hot’. Our results suggest that the PPD can be used as an index of the variability of thermal sensation, but not of thermal comfort in a main line vehicle in summer.
