| With the development of new towns, and vigorously promote green energy-saving buildings, actively promote the construction of the residential construction industry, it has become an important trend in the current development of China’s construction industry. Steel residential green building is the whole life cycle, to meet the immediate requirements of sustainable development. Development of steel housing, both conducive to solving the problem of excess steel production capacity, but also conducive to the promotion of housing construction industry transformation. At the same time, building energy efficiency requirements and the occupants thermal comfort requirements increasing trend, the thermal performance of residential buildings and the suitability of the local climate is particularly important. Steel residential development focus lies in its support of the research envelope system, building envelope thermal performance depends largely on the thermal performance of the pros and cons. Currently, our research on steel residential building envelope system is still immature, and the lack of a unified structure and thermal envelope design standards, has not yet formed the local climatic conditions suitable envelope system. Has been the development and construction of residential steel project, its envelope persists structural defects, thermal comfort can not meet the needs of tenants under local climatic conditions.This paper mainly studies Envelope and local climatic conditions in northern regions of applicability steel housing, and the corresponding thermal optimization scheme based on principle. Through the relevant literature collected, combined with related design and thermal specifications summarized both types of steel structure residential buildings, and the type of envelope thermal performance. The region has been built by the steel housing to carry out field research and testing, study the thermal insulation properties of steel house envelope structure, room temperature stability, and by the household survey questionnaire and field test data obtained directly reflect. Meanwhile, the actual project site visits and found that the presence of thermal bridges steel exterior wall envelope both residential and subjected to a preliminary analysis.Based on Heat Transfer and room thermal stability principle, an optimization program for steel residential buildings, walls, windows and exterior wall thermal bridge node configuration. In actual construction model for the study, the use of DeST-h software for optimization(changing outer glazing material, change the material and construction of interior walls) of the building indoor environment simulation, and the simulation results were compared to explain optimization program for building envelope thermal performance improvements. Establish a thermal bridge node facades of residential sites measured as the research object model, using ANSYS finite element analysis software for the optimization program(change in external walls steel keel spacing, changing filler insulation layer steel keel, steel keel web openings) External Walls node extension in the thickness direction of the heat transfer analysis, and comparative analysis of simulation results, set forth for optimization of exterior wall thermal bridges weaken the effect of the impact.The results show that: the process of using the existing steel housing indoor thermal environment of the room poor thermal stability, thermal bridges in its outer wall is also very obvious, reducing the thermal insulation properties and external walls. By targeting and optimization of structure and form of the composition of the thermal bridge node envelope, can effectively improve the thermal performance of the building envelope, and weaken the influence of the heat transfer of exterior wall thermal bridge. Through the rational use in the actual project, can effectively improve steel residential building envelope thermal suitability under local climatic conditions. |
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