Research On Typical Building Energy Models Of Commercial And Residential Buildings In The Pearl River Delta Region

With the rapid development of urbanization,traffic pressure is increasing gradually.With the advantages of rapidity,punctuality,and comfort,the subway has become a necessary means of transportation for the development of many cities.With the large-scale construction and operation of the subway,energy-saving and consumption reduction,reducing initial investment and construction difficulty reduction have become a very important issue that need to be solve.The Subway tunnel ventilation system is one of the most energy consuming and widely concerned,but the thermal environment of subway tunnel is affected by many factors,and the outdoor temperature in Guangzhou is high.In this paper,a typical station tunnel of Guangzhou Metro Line 2 is taken as the research object.The thermal environment of the station tunnel is studied deeply,and the optimization scheme of heat exhaust ventilation and energy saving is put forward.Based on the 18-month real-time network online test of typical station tunnels,combined with the calculation of design drawings,this paper analyzes the influence of heat generation of train operation,heat generation of catenary energy loss,heat exchange of piston wind,heat exchange between platform and tunnel,and heat exchange of surrounding rock soil on the thermal environment of the tunnel in a single period of train operation.The calculation results show that the heat dissipation of train condenser has an effect on the station tunnel The thermal environment of the track has the greatest impact,followed by the brake heatdissipation of the train.According to the measured data,the temperature and piston wind speed of the station tunnel in a single period,all day and year are analyzed.It is found that the near the station tunnel is to the exit,the higher the temperature is,and the rail top temperature is higher than the rail bottom temperature.The piston wind speed is related to the train speed.As the train speed decreasing,the piston wind speed is gradually reducing.At the same time,the influence of train number,outdoor temperature and humidity,and passenger flow on the temperature of station tunnel is also studied.It is concluded that the temperature of station tunnel is greatly affected by train number,outdoor temperature,passenger flow and other factors,less affected by outdoor humidity,and the piston wind speed is greatly affected by train number.On this basis,compared with the temperature change rule in summer and winter when the station tunnel exhaust hot air fan starts and stops,it is found that when the exhaust hot air fan is closed in summer,the instantaneous temperature at the rail top will exceed 46 ?,while the heat exhaust effect of the rail bottom exhaust hot air outlet in summer and winter is poor,especially in the case of high outdoor temperature in summer,long-term cooling occurs.Therefore,this paper puts forward the optimization scheme of heat exhaust ventilation of station tunnel,which is to keep the heat exhaust duct on the top of the rail and to cancel the heat exhaust duct on the bottom of the rail.According to the actual operation of the air volume of the hot air exhauster in the test station,the adjustment scheme of the hot air exhauster in the station tunnel is optimized by using the method of comparative adjustment,which provides the basis for the research on the ventilation system of the subway station in Guangzhou area.Finally,this paper established a three-dimensional model of equal proportion for the test station,simulates the distribution of velocity field and temperature field after the elimination of the heat exhaust duct at the rail bottom by CFD,and verifies the feasibility of the elimination of the heat exhaust duct at the rail bottom by combining the measured data under the opening and closing conditions of the heat exhaust fan.