EXPERIMENTAL EVALUATION OF THERMAL INSULATION PERFORMANCES OF URBAN TRANSIT TRAIN COACH

초록

Thermal insulation performance of urban transit coach is getting more important due to the rising energy cost nowadays. Thermal insulation performance can be obtained by calculating the heat transfer for each component in the coach. However, the obtained thermal insulation performances obtained by calculation are not correct since the systematic aspect of the coach was not considered. The intricate interfaces between each materials and the airflow inside or outside of the coach is hard to consider. For this reason, experimental evaluation using a climatic chamber is preferred to obtain the real thermal insulation performance of the coach nowadays. The temperatures of the climatic chamber were set at several desired temperature, and the heaters inside the test coach was operated at several desired power. The temperature change during heating was monitored, and the heat transfer value was obtained by using the saturated average temperature inside the coach. Heat transfer values under various experimental conditions (e.g., fan operation, heater power, insulation panel, door blocking, window blocking, etc.) were obtained. From this study, the contribution of each factor on the enhancement of thermal insulation performances of coach could be quantitatively presented.