Thermal Performance Research Of A New Type Of Steel-Concrete Sandwich Modular Wall System Enclosure In Cold Regions

In recent years,with the implementation and support of the government,prefabricated buildings have made great progress,and in the context of global warming,a series of measures such as green buildings and carbon peaking and carbon neutrality goals have been proposed.The energy saving problem of prefabricated buildings has become a research hotspot,especially the thermal performance of the enclosure structure.Therefore,this thesis is a research on the enclosure structure of the new steelconcrete sandwich module wall system,analyze the influence of the three factors of the shear connectors,insulation material and insulation thickness of the sandwich insulation wall on the heat transfer coefficient of the envelope wall and the heat transfer coefficient of the structural thermal bridge.The study summarizes the construction of walls that meet the average heat transfer coefficient standards for walls in cold regions with different energy-saving criteria and calculates the carbon emissions per unit wall for various scenarios of the new system.Firstly,the thermal performance of the new steel-concrete sandwich module wall system enclosure structure was tested using the protective heat box method and the temperature control box-heat flow meter method to verify the accuracy of the COMSOL software “solid heat transfer” module in simulating the thermal performance of this new system enclosure structure.Through the variable parameter method,the influence rules of different shear connection methods,sandwich insulation materials and insulation thickness on the thermal performance of the enclosure structure were obtained.Based on the influence of the thermal performance of the new system enclosure structure,the thermal performance limits of different energy-saving standards for enclosure structures in cold regions are summarized.The applicable situation of the new system wall structure meeting different energy-saving standards is given.At the same time,use Grasshopper software to analyze quantitatively the carbon emissions of the new system unit wall in the use stage,building material production and transportation stage,and to find out the reasons that affect the calculation of carbon emissions per unit wall by changing the sandwich insulation material and insulation thickness.Finally,according to the applicability of the new system wall structure to meet energy-saving standards in different cold regions,summarize the carbon emissions per unit wall of the new system.The results show that the new steel-concrete sandwich modular wall system can meet the requirements of a series of energy-saving standards in cold regions for the average heat transfer coefficient of the wall by changing the insulation thickness.Among the three insulation materials studied,the use of graphite polystyrene board as sandwich insulation is the material with the lowest carbon emission per unit wall under the condition of meeting various energy saving standards.The conclusion of this thesis provides reference and data support for the promotion and use of new steel-concrete sandwich modular wall system and similar new prefabricated building system and the reduction of building carbon emissions.