| With the rapid growth of China's national economy and the accelerated process of Urbanization,urban rail transit has been developed rapidly in recent years as an efficient and convenient mean of transportation,so the demand for energy saving is also becoming more significant.The effective use of natural ventilation can improve the air quality in subway station and improve the thermal comfort of winter and transitional seasons.In the same time,it can replace or partially replace mechanical ventilation and air conditioning to achieve the purpose of energy conservation.The subway as the representative of the existed urban rail transit design of the environmental control system lacks of the understanding of the natural ventilation of underground station.In the design and operation of ventilation and air conditioning system,the influence of natural ventilation can not be considered properly.Therefore,it is necessary to study the use of natural ventilation in subway stations and to find a more reasonable ventilation and air conditioning operation mode,in order to achieve the purpose of energy saving.In this paper,it first tests several subway stations in Chongqing and Chengdu in different seasons and different working conditions during the period from 2015 to 2016.The main contents of the test include the ventilation condition and the temperature and humidity of the entrance and exit,the temperature and humidity and CO2 concentration of outdoors and the station.It also tests the distribution and the change of CO2 concentration of the station hall layer and the platform layer in the case of opening and closing mechanical fresh air system.The existing scale of natural ventilation and thermal environment condition in subway station are obtained by testing.The existing natural intake air quantity is about ten times the amount of maximum number of fresh air demand in the station.So it can completely meet the demand for fresh air volume.Then,the DeST numerical simulation method is used to carry out the annual building energy consumption and thermal environment numerical simulation analysis of subway station in this paper.The feasibility and reliability of DeST numerical simulation method to study the influence of natural ventilation in subway station is verified by comparing with the measured results.The hours which are higher than 29? in the platform are defined as excessive hours of temperature and they are counted onthly.The outdoor weather and working conditions of the corresponding time of thermal environment are analyzed.The operation mode and the conversion conditions of the control measures of the station thermal environment,such as natural ventilation,natural ventilation + mechanical ventilation,natural ventilation+ air conditioning are put forward.Then the simulation analysis is made on the different natural ventilation volume,different passenger flow level and different area,and puts forward the suggestion and method of full and effective use of natural ventilation.Finally,this paper takes the Shapingba subway station of Chongqing as an example.The number of energy saving operation days of different energy saving operation modes are obtained.On the basis of this,the energy saving of the full use of natural ventilation is predicted in detail.And then it analyses the number of energy-saving running days in the different climatic zones of the city of Shanghai,Beijing,Guangzhou,Chengdu and other cities throughout the year,and the energy saving of the whole year is calculated.Due to regional differences in energy saving is different,the utilization of natural ventilation in each city has a great potential for energy saving. |
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