Research On Ventilation Control Strategy And Energy Saving Potential Of Railway Station Waiting Hall

Railway station building is the infrastructure of the whole railway transportation system.Large space,long air conditioning period and high load have become the main characteristics of railway station building.In order to shorten the operation time of air conditioning in railway station building and save the energy consumption of air conditioning,a new type of mechanical ventilator is proposed to ventilate the waiting hall of railway station building in transition season and part of air conditioning period.In this thesis,a new mechanical ventilator is used to ventilate and cool the waiting hall in large space.The indoor ventilation effect is simulated and analyzed,and the ventilation control strategy to meet the indoor comfort under different outdoor temperatures is given,and the energy saving potential of the mechanical ventilation method in different climate areas is analyzed.In this thesis,the elevated waiting hall of a railway station in Wuhan is selected as the research object,and the large space waiting hall model is established by CFD software to simulate the indoor air distribution of natural ventilation under the action of thermal pressure,and the outdoor temperature range suitable for natural ventilation is proposed.The results show that when the outdoor temperature is lower than 22 ℃,the natural ventilation of the elevated waiting hall can meet the requirements of indoor thermal comfort.When only natural ventilation can not meet the requirements of indoor thermal comfort,two mechanical ventilation methods are proposed,which are mechanical ventilator and existing air-conditioning system.The layout of mechanical ventilators is optimized,and the indoor ventilation effect of the two ventilation methods is simulated and analyzed to determine the optimal ventilation method and control strategy.The results show that mechanical ventilators are installed at the height of 0.5m and 1.5m respectively from the glass curtain wall to the ground,and the ventilation effect is the best when the air is supplied horizontally;The ventilation effect of mechanical ventilator is better than that of air conditioning system;In order to meet the requirements of thermal comfort in the ventilation environment of waiting hall,the ventilation control strategy of mechanical ventilators is determined according to different outdoor temperatures: when the outdoor air temperature is 22～23 ℃,the opening area of ventilators accounts for 0.08% of the total waiting hall area;When the outdoor air temperature is 23～24 ℃,the opening area of ventilators accounts for0.16% of the total waiting hall area;When the outdoor air temperature is 24～25 ℃,the ventilation area of ventilator accounts for 0.39% of the total waiting hall area;When the outdoor air temperature is 25～26 ℃,the ventilation area of ventilator accounts for 0.55%of the total waiting hall area.De ST load simulation software is used to analyze the energy saving potential of typical station buildings in different climate regions based on the ventilation strategy.Considering the total energy consumption of mechanical ventilators,the simulation results show that the energy saving rate of this ventilation strategy is 13.5% in Wuhan,41.1% in Harbin,14.8%in Zhengzhou and 14.6% in Guangzhou.