Effect of Air Mixing on Subway Cabin Temperature during Heating in Winter Season

초록

Public interest on the thermal comfort of subway cabin is increasing, since more than 90% of the complaints from passengers are about the thermal discomfort. Some passengers may feel hot, while the others may feel cold even in the same cabin due to the uneven temperature distribution in the cabin. For this reason, the temperature difference in the cabin should be as small as possible. In our present study, the effect of air mixing on the temperature inside the subway cabin during heating was studied by using a climatic chamber. Ambient temperature was set at around ?0 ？C, and the heaters of cabin were operated. Thermocouples were installed inside the cabin, and the temperature of each point was monitored. Various numbers of small house-hold fans were installed inside the cabin to induce the air mixing. It was found that the maximum vertical temperature difference could be reduced by increasing the number of fans.