Research Of Thermal Bridge On Nodes Of The Wall-post Of Thermal Self-insulation Exterior Walls In Hot Summer And Cold Winter Areas

In consideration of the serious energy-using situation and the rapid growth in energy-consumption of constructions and buildings, energy-saving in buildings have become increasingly important. Wall is one of the most important parts in the envelope of residential building. In hot summer and cold winter areas, nearly 20 to 30 percent of total thermal loss in residential buildings is caused by the wall. Considered to the climatic characteristics, economic condition and the situation of energy-saving in building of Zhejiang province, there is huge space for thermal self-insulation technique's use in the wall.In this paper, the control index of over-all heat transfer coefficient of the main part of the typical construction exterior walls is quantitatively researched under the condition of different energy-saving request and different processing mode of thermal bridge, by means of importing the concept of area ratio of column to wall and correlative area ratio of window to wall. The defect of setting the control index of over-all heat transfer coefficient of exterior walls in current specification is analyzed under the request of the energy saving rate reaching 65% or higher. The concept that the area ratio of window to wall is relative to the control index of over-all heat transfer coefficient is also put forward.The research technique that combines the testing in spots and numerical simulation is used. At first we use heat-flow meter to test four different walls which contain constructional column of different size, calculate the over-all heat transfer coefficient of the main wall and the reinforced concrete column of different wall respectively, so the average over-all heat transfer coefficient can be got. And then the ANSYS finite element software is adopted to simulate the temperature field of the actual walls, which directly shows the temperature distribution of the computational zone. By analyzing temperature field in detail, the influence scope of thermal bridge can be determined. At last we compares the testing data in spots to numerical simulation results to analyze the relationship between the width of dovetail joint in constructional column(or not set) and thermal bridge, and the relationship between the width of constructional column(or not set) and thermal bridge.