Effect of ventilation on thermal and humidity environment of the underground utility tunnel in the plum rain season in southern China:Field measurement and CFD simulation  

作　　者：Huixin Ma Xuanyi Zhou Jian Huang 

机构地区：[1]State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China [2]Shanghai Municipal Engineering Design Institute(Group)Co.,Ltd.,Shanghai 200092,China

出　　处：《Underground Space》2023年第6期301-315,共15页地下空间（英文）

基　　金：supported by the Sponsored Shanghai Rising-Star Program,China(Grant No.20QB1404900);the National Natural Science Foundation of China(Grant No.52078380);the Ministry of Science and Technology of China(Grant No.SLDRCE19-B-14);the National Key Research and Development Program of China(Grant Nos.2017YFC0805000 and 2016YFC0802400);the Construction Program of Shanghai Engineering Research Center,China(Grant No.17DZ2251800);which are gratefully acknowledged.

摘　　要：The underground utility tunnel(UUT)is one of the typical urban underground structures,which usually requires mechanical ventilation systems for forced ventilation.In addition to the ventilation scheme for accident scenarios,the normal operating ventilation scheme deserves equal attention as it has a great impact on the air quality as well as the thermal and humidity environment inside the UUT.In this study,a UUT located in southern China is taken as the research object,and the effect of ventilation on its internal thermal and humidity distribution is explored with a combined use of field measurements and numerical simulations.The results of field measurements show that the average temperature inside the closed UUT is 20.5℃and the average humidity ratio is 14.1 g/kgdry;both are lower than those of the external environment.In the plum rain season,if the tunnel is ventilated without any treatment of the external airflows,surface condensation tends to occur near the air inlet while the region with high relative humidity would be distributed on both sides far from the air inlet.The study also discusses the effect of different temperatures and humidity ratios of the inflow air on the humidity inside the UUT,and on this basis,the humidity control strategy for UUT in the plum rain season is proposed.

关 键 词：Underground utility tunnel(UUT) Mechanical ventilation Plum rain season Computational fluid dynamic Thermal and humidity environment 

分 类 号：U45[建筑科学—桥梁与隧道工程]