Improvement of efficiency of heat exhaust system in underground railway stations

Simulates and analyses the distribution of air temperature in underground railway tunnel. According to the principle of heat exhaust, derives the formula for calculating the efficiency of a heat exhaust system. Puts forward the suggestions for optimizing the arrangement of heat exhaust outlet and the distribution of air volume. Points out that the heat exhaust outlet should not be right facing the heat release source of the train, but should be laid in the downstream of the heat source along the airflow direction of piston wind; the air volume of heat exhaust outlet should be increased gradually from the rear of the train to the head.