Analysis Of Thermal Insulation And Energy Saving Of The External Wall In High-rise Building

With the construction of high-rise and extra-high-rise buildings, building energy consumption intensifies unceasingly. At the same time, the energy shortage becomes serious day by day. Therefore, building energy-saving becomes especially important today. The external wall, being the most important part of the building envelope, creats nearly 48 percent of the total energy loss caused by the building envelope. So, the research of the thermal insulation performance of the external wall in high-rise buildings is extremely essential.First, the heat transfer coefficient and the temperature fields of several typical external wall of high-rise buildings in Harbin were measured on site. Through the contrast of the external wall of high-rise frame and shearwall structure buildings, we can include that the thickness of insulating materials of the former one can be relatively thinner, and the thermal performance could be relatively poorer. And, high efficient thermal insulating materials are commended for the latter one. Besides, the change of the heat flow and the change of the temperature of the internal surface of the wall are both influenced by the heatingmode.Secondly, some factors influencing the process of the tests have been analyzed. The results show that the measure error of the thermal resistance of the wall is influenced not only by the thermal inertia of the wall, but also by the wind speed outdoors, as well as the heat flow meter itself. In addition, the thermal resistance has been modified in this paper.Thirdly, based on transient thermal transfer simulation of the walls which were tested, the simulation method chosen in this paper was proved feasible. Through the contrast of the good points and bad points of the different ways of heat preservation, as well as the simulation of the stability of the internal surface temperature of the wall and the temperature difference of the main body of the wall, the advantage of the external thermal insulation has been displayed.In addition, on the base of the research of attenuation multiple and delay time, we include that they are both influenced by the ways of heat preservation, the type of the main body materials, as well as the thermal insulation materials. So, the structure with ceramsite hollow block for the main body of the wall and XPSpanels for the insulation material, is suggested in Harbin area.Finally, taking a frame structure high-rise building in Harbin for example, the optimal thickness of insulation material has been analyzed. In this chapter, the optimal thickness of insulation materials, which are commonly used in the external insulated walls of high-rise buildings in Harbin, are displayed. What's more, by means of the calculations of the economic recovery period of insulating system, we can see that external insulated walls save both energy and money.