| With the rapid development of China’s economy,building energy consumption has also increased year by year.The country is pursuing energy-saving and environmental improvement,and vigorously promotes fabricated steel structures.Assembled steel structures are constructed using field-mounted technology combined with steel structures.Therefore,in the fabricated steel structure,problems such as thermal bridge and airtightness caused by factors such as gaps between members are more likely to occur.Based on the field investigation and actual research on the fabricated steel structure residential buildings in the cold regions of Xinjiang,this paper explores a set of energy-saving optimization system suitable for the fabricated steel structure residential buildings in the cold regions of Xinjiang,and designs and optimizes the energy-saving optimization system for the key nodes of this type of residential buildings.Construction provides a reference.The paper mainly takes the No.2 building of Dongfeng Community in Urumqi as the research object.Through field research,actual measurement and software simulation,combined with local climatic factors,it proposes a set of energy-saving design solutions to solve the problem of thermal bridge and air tightness.The specific contents are as follows:When the thermal bridge problem is combined with the actual construction drawing and field investigation,the thermal bridge is used to measure the actual building by thermal imaging.The measured results show that there are 6 connecting nodes in the outer protective structure of the fabricated steel structure house,namely:a joint between the underground outdoor wall and the roof,b the connection between the indoor and external walls,the connection between the c floor and the external wall,the connection between the d roof and the outer wall,the connection between the e roof and the parapet wall,and the splice node of the outer wall panel is easy to produce.Thermal bridge;using P-Temp software to simulate each node according to engineering practice,the heat transfer coefficient of each node is greater than 0.01 W/(m·K),which verifies that the above nodes do have thermal bridges;Further,the thermal energy-saving design of the above nodes is carried out,and the energy-saving optimization construction measures for the thermal bridge problem of the node are proposed.Finally,the simulation verification is performed by P-Temp software.The calculated line heat transfer coefficient after energy-saving design is basically less than or equal to 0.01 W/(m·K),which proves that there is no thermal bridge in the node after optimization design.For the airtightness problem of fabricated steel structure residential buildings,this paper combines the door and window gap method,the calculation formula of permeability and heat consumption,and the research status of airtightness of building envelope structure,using the building fluid simulation software PHOENICS to different locations around the actual building.The wind environment was simulated to obtain the average wind speed and wind pressure of the actual building facades.The theoretical air permeation amount of a certain room in the house was 32.46 m~3/h,and the heat consumption was 51.34W.The final calculated theoretical unit seam length grading index value q1 is 3.0 m~3/(m·h),which does not meet the requirements of the 7th grade(1.0≥q1>0.5),so a new airtightness is proposed for the fabricated steel structure house.Sexual design,including the design of the inner liner and the airtight design of each key node.The thermal bridge and airtight optimal design scheme for the prefabricated structure of fabricated steel structure residential buildings in the cold regions of Xinjiang can provide suggestions and references for the energy-saving design of the assembled steel structure in severe cold and other areas,and promote the construction of this type of building. |
PDF Full Text Request