| In recent years,many cities have opened subway lines,and the development of subways has entered a climax period.With the rapid development of subway construction,subway stations are facing more and more problems.Among them,the adverse effects of ground cooling towers are particularly prominent.Complaints from surrounding residents.In order to solve this problem,this paper proposes a subway dedicated invisible cooling tower to solve a series of problems caused by the cooling tower placed on the ground.The invisible cooling tower for subway is to use the underground space between the new exhaust shafts of the subway station to place the cooling tower underground.After the air introduced by the new exhaust shaft passes through the cooling tower and exchanges heat with the cooling water,it is discharged by the exhaust shaft.This article takes a subway station in Guangzhou as a research background,and takes a prototype of a special subway invisible cooling tower developed by a company as a research object to study the energy saving and feasibility of the subway invisible cooling tower used in a subway air conditioning system.First,this paper uses Energy Plus load energy consumption simulation software to establish the load model of a typical island subway station,and simulates the hourly load situation of the subway station,and obtains the hourly load distribution and maximum load of the air conditioning season of the subway station.Secondly,this study takes the prototype of the subway invisible cooling tower as the experimental object,controls and tests the various factors that affect the cooling tower outlet temperature,calculates and analyzes the experimental results,and provides experimental data support for the establishment of subsequent cooling tower models and the simulation of energy consumption in subway stations.Then,the air temperature and humidity of the new exhaust duct of the subway station were tested for up to four months,and there are a lot of data on the temperature and humidity of the subway station exhaust air.According to the analysis data,in the summer,the temperature of the wet air of the exhaust air of the subway station is about 2? lower than thatof the fresh air,which provides a basis for the subsequent simulation of the invisible cooling tower dedicated to the subway station.The SPSS software was used to fit the multiple regression equation of the cooling tower experimental data,and the model was tested using the measured data.The fitting situation was good.The fresh air and exhaust wet bulb temperatures of the subway station are brought into the model for calculation.At the same time,a conventional cooling tower model fitted by existing scholars is used to substitute the fresh air data to obtain the daily changes of the three cooling tower outlet temperatures..Finally,using three different cooling tower outlet water temperatures,energy consumption simulation calculations are performed in Energy Plus to compare the energy consumption of the chiller.Obtained that a conventional cooling tower uses fresh air to save energy by 1.28% than a subway dedicated invisible cooling tower.The subway dedicated invisible cooling tower uses exhaust air to save energy by 3.39%.The subway dedicated invisible cooling tower uses fresh air to save energy by 3.39%.Conventional cooling towers use fresh air to save energy by 2.06%.Comprehensive analysis shows that the invisible cooling tower dedicated to the subway not only solves the problems of flying water,noise,and floor space caused by placing cooling towers on the ground.Its cooling capacity is comparable to that of cooling towers on the ground.The investment and certain design and construction difficulties have solved the surrounding environmental problems and residents' complaints once and for all.It will also produce certain energy-saving benefits in the hot summer and warm winter areas.It is extremely feasible to apply the invisible cooling tower dedicated to the subway to the ventilation and air conditioning system of subway stations. |
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