Thermal Environment Monitoring And The Numerical Simulation Of Heat Pump Air Conditioning System Of The Subway Station In Cold Area

In recent years,with the rapid development of market economy in our country,at the same time,the economic strength is also growing,more and more people choose to migrate to urban,so the expansion is enlarge in the city.With the increase of urban population,too much population makes face great pressure on urban traffic,and public transportation not only is the important way to solve the urban traffic pressure is also the important factors influencing the city's economic development.The subway become an important public transportation to reduce the pressure on urban traffic with its large capacity,high speed characteristics.However,the subway station is the place that a large number of passengers gathered,on-site personnel density is higher,and the subway long-dated operating temperature is rising.In order to create a more comfortable ride a passenger environment,so many researchers focus on the research subject of station environment problems.Due to the geographical location of Harbin is more special,it is high latitude and low temperature.According to the characteristics of the Harbin location,inorder to find a more suitable environmental control system for subway station in Harbin,satisfy the thermal comfort of human body,create a more comfortable driving environment for passengers.In this paper,the research content is the following:(1)We regard Harbin metro line 1 as the research object,analysis the fectors of cooling load in the station,and measure the four stations of line 1 station environment parameter from 2016 to 2017.The main content of measurement including CO2 concentration,temperature,humidity,wind speed,And to contrast the Harbin line 1 and Kunming line 3 on station environment parameter measurement in the summer of 2015,and we choose one of the stations as an example,computing the cooling load.The results showed that the museum station is close to the business circle,in summer,peak temperature within the station is more than 30 ? in the morning and evening,the CO2 concentration is up to 1950 PPM around 5 p.m.comparing 2015 with 2017,we found that the average temperature is rising with the increase of operating time;(2)We refer to Harbin metro station with characteristics,to determine suitable application of ground source heat pump system operating mode for subway station in Harbin,and according to the calculation by the station of the peak load,we select various equipment of the ground source heat pump system,including the selection of cooling tower and buried pipe heat exchanger.Calculating the area of ground source heat pump system,we can get that pjpe length is 10969 m.the depth of the shaft is 100 m,shaft number is 53;(3)Establish a 3D physical model of the subway station with the Gambit,from the source heat pump selection results and the measured data,the computational fluid dynamics CFD software is used for metro stations to simulate the temperature field analysis and flow field analysis.The main heat source of station hall is the human body and automatic machines,the ambient air temperature is higher,but with the heat pump system of the station environment constantly adjusting,the heat gradually spread to the surrounding environment,and the spare part quantity of heat through the station hall spread to the environment.Driving range in the rail top,rail bottom exhaust wind speed of the train is around 0.25 m/s.the platform in the train and the human body are the main source of the heat,on-orbit line area,due to the train cooling,there is a higher temperature in the tunnel,and on the platform,is affected by the human body heat dissipation,the flow of air around the body temperature is higher about 30?,upon completion of the moment,you can see that the platform temperature is reduced,the air around the body temperature down to about 26?,when the exhaust will exhaust the heat generated by train and condenser to the platform,the wind speed keep at around 0.14 m/s above the body.In the summer,air conditioning wind speed is not more than 0.3 m/s in requirements,it can achieve human comfort standard;(4)Finally?we compared ground source heat pump system with the traditional water chiller,including initial investment and operating energy consumption calculation and analysis,maintenance costs of two systems,the results found that source heat pump system energy-saving is better.Although the ground source heat pump system construction causes 54%higher initial investment than a conventional chiller,and the ground source heat pump system running and maintenance cost are nearly lower70%than the chiller,the use of ground source heat pump system can reduce a large number of emissions of pollutants,can effectively improve the atmospheric pollution each year.This article provide some reference for the future of the subway construction by the research method and the results,it is important to save energy and improve the internal environment.