Simulation And Analysis Of The Natural Ventilation Of Kunming Train Station Waiting Hall

In the reduction of public building energy consumption and improving the indoor air quality, the rational using of natural ventilation of the application has great value potential and practical in engineering application. Larger movement of the train station in such public buildings, fresh air is also in high demand, Indoor air flow is the premise of indoor air, Therefore the using of natural ventilation is very important, especially in the transition season.On the basis of the principle of natural ventilation, analysing Kunming climate characteristics, giving potention of natural ventilation as well as the evaluation of indoor thermal comfort model—adaptiving thermal comfort model. In the light of the indoor thermal comfort of waiting hall of the two floor in Kunming station,using CFD simulation software to simulat waiting room of the second floor temperature and wind field simulation analysis. Influence of natural ventilation on the factors are the temperature difference between indoor and outdoor、outdoor wind speed and the area of the windows, Using the control variables which is given a single variable condition indoor comfort changes, and Obtaining the changing law between the indoor comfort and by more than a factor of three.Using fluent and gambit software setting up and analyzing the outdoor wind speed under the train station pressure field variation, giving the two floor waiting hall, exhausting window pressure boundary condition. The results of the simulation analysis, in the outdoor temperature of17℃and outdoor wind speed is2.7m/s, the window area of air inlet side is32square meters, meeting90%acceptable degree is the maximum, the indoor temperature and the area of window can be considered as parabola relationship. When the outdoor wind speed decreases to a certain extent, pressure will not play a leading role, indoor temperature and speed of outdoor wind can be considered as the downward opening parabolic curve relationship,while the press is the main factor of natural ventilation; when the outdoor temperature is relatively low, this time to meet the requirements of temperature, the window area control in the minimal state, we think that waiting staff thermal comfort does not depend on the size of indoor wind speed; When the indoor temperature is greater than the outdoor temperature, the wind outside has the same premise, outdoor temperature of indoor waiting staff comfort effection is relatively smaller. The above points can be used as the Kunming train station on the improvement of the existing natural ventilation guidelines and measures. At the same time, a compared with mechanical ventilation:the indoor thermal comfort condition, natural ventilation mechanical ventilation will more energy, and the huge potential for energy saving.