Research On Renewal Design Of Existing Railway Station Based On Low-Carbon Concept

With the rapid development of high-speed rail,the existing railway stations on ordinary railways have gradually shifted from passenger transportation to passenger and freight transportation.These railway stations are not only windows for people’s travel,but also direct reflection of the city’s impression.There are problems with poor building performance and high building energy consumption.How to carry out low-carbon renewal without demolition and reconstruction,improve its building performance and energy-saving effect,is the focus of low-carbon renewal research on such railway stations.This thesis takes the existing railway station in Hebei section of Beijing – Guangzhou railway as the research object,aiming at its poor building performance and low energy-saving effect of the envelope structure,uses the energy consumption numerical simulation method and the orthogonal Design of experiments method to analyze the impact factors of the energy consumption of the envelope structure and the utilization of renewable energy sources during low-carbon renewal.On this basis,further studies the low-carbon renewal technology of the existing railway station suitable for cold regions and the selection of technical parameters of the envelope structure,Finally,take the existing railway station Zhengding railway station as an example to verify the low-carbon renewal design strategy.The main work and achievements are as follows:First of all,the survey on the current situation of 28 existing railway stations in Hebei section of the Beijing–Guangzhou railway was completed.It was found that the existing railway stations had problems such as poor building facade effect,poor wall cracking and insulation effect of the envelope structure,and low energy-saving effect of doors and windows.The station site had renewable energy utilization conditions,which provided research material support for low-carbon renewal of such existing railway stations.Secondly,use the Honeybee energy consumption simulation software on Rhino Grasshopper platform to simulate the energy consumption and energy consumption influencing factors of the existing railway station,theoretically analyze the impact of the Heat transfer coefficient of the enclosure structure on energy consumption,and get the best Heat transfer coefficient value range of the enclosure structure is 0.2～0.5for the external wall,2.1～2.4 for the external window,and 0.15～0.45 for the roof;Reducing the Heat transfer coefficient of the envelope can significantly improve the energy saving rate of building heating,but not significantly improve the energy saving rate of cooling.On this basis,the single index orthogonal Design of experiments method is used to complete the optimization analysis of different energy consumption influencing factors of the enclosure structure,and the order of energy consumption influencing factors from large to small is: exterior wall>roof>doors and windows.The Heat transfer coefficient of the lowest energy consumption scheme of the enclosure structure is 0.2 for exterior wall,2.1 for exterior window,0.15 for roof,and 1.97 for exterior door.Its heating energy saving rate is 59.87%,refrigeration energy saving rate is 8.90%,and the annual energy saving rate is 17.47%.Thirdly,based on the building performance of existing railway stations and the climate conditions in cold regions,the feasibility of low-carbon renewal of such existing railway stations is analyzed from the technical aspect,and it is concluded that the appropriate technology for low-carbon renewal of such railway stations is passive energy conservation for the enclosure structure,active solar power generation for the roof,Geothermal energy heating and cooling for the site outside the station,external insulation for the wall of the enclosure structure,and inverted insulation roof for the roof.According to the current specifications,the multi index orthogonal Design of experiments method was used to complete the multi index coupling analysis of energy efficiency,carbon emissions and material costs.It was found that the XPS extruded polyphenyl foam board insulation material was the best for the enclosure structure,and the optimal technical parameters were the insulation material,which was 70 mm thick for the external wall,140 mm thick for the roof,metal insulation door for the external door,and SC=0.3 plastic steel LOW-E hollow glass window for the external window.Finally,take the existing railway station Zhengding railway station as an example to simulate the low-carbon renewal design,and use the single index orthogonal test to obtain the optimal scheme with the minimum energy consumption.The insulation material thickness is 100 mm for the exterior wall and 200 mm for the roof.Utilizing multi index orthogonal experiments to obtain a multi index coupling optimization plan for energy efficiency,carbon emissions,and material cost control.The insulation material thickness is 70 mm for the exterior wall and 140 mm for the roof.The thermal insulation materials of the obtained scheme are XPS extruded polystyrene foam board,the external door is metal thermal insulation door,and the external window is SC=0.3 plastic steel LOW-E hollow glass window.The optimal low-carbon renewal scheme with multiple indicators coupling has a heating energy saving rate of 57.34%,a cooling energy saving rate of 13.84%,and an annual energy saving rate of 18.15%.The low-carbon renewal of existing railway stations adopts light intervention,micro renewal,and low-carbon strategies for buildings.The enclosure structure adopts a multi index coupling strategy of energy efficiency,low-carbon,and material cost control.The station roof adopts solar power generation,and the square in front of the station adopts a renewable energy utilization strategy of ground source heat pump heating and cooling,which has obvious energy-saving and carbon reduction effects.