Research On Air-tightness Test Of High-rise Residential Buildings And Influencing Factors Of Air-tightness Test Of High-rise Residential Buildings

In order to achieve my country’s"carbon peak"and"carbon neutral"goals,energy conservation and emission reduction are imperative.Building energy consumption accounts for nearly one-third of my country’s total energy consumption.It is imperative to develop ultra-low energy buildings and net zero energy buildings to reduce building energy consumption.The energy loss caused by air leakage in ultra-low energy buildings accounts for 25%to 50%of the total building energy consumption,so air-tightness has become one of the key contents of the research on ultra-low energy buildings and net zero energy buildings.With the continuous advancement of my country’s urbanization process,high-rise buildings have become the main form of urban buildings.At present,theories and methods for air-tightness test of high-rise buildings are not yet perfect.In this research,through the air-tightness measurement,CFD numerical simulation and theoretical analysis of high-rise buildings,various natural and human factors that affect the air-tightness test of the building are studied,and the internal connection between the air-tightness of the building and the test influencing factors is explored.The research content and conclusions are as follows:（1）The air-tightness test was conducted on 35 buildings in Hebei Province and 13 high-rise buildings in Zhejiang Province by using the differential pressure method,and the air change frequency N₅₀ was between 0.3 and 0.6 h^-1,which met the requirements of the Technical Standard for Near-Zero Energy Building Requirements.And according to the air-tightness test data of 35 different types of buildings in Hebei Province,the conversion relationship between the pressure difference of 50 Pa and the number of air changes under the natural pressure difference was studied,and the relationship was obtained with the meteorological conditions,building structure,and construction at the time of the test.The resulting natural gaps are related,and their relationship can only be determined through the air-tightness test of the building.（2）Taking high-rise buildings as the research object,analyze the human factors and natural factors that affect the air-tightness test of high-rise buildings,and get the favorable measuring point placement position,measuring point direction and measuring point orientation during the test;The test shows that the natural pressure difference between the north and south sides of the building with a height of 80 m is 0～4 Pa;when the pressure difference between the indoor and outdoor natural pressure difference between the top floor and the bottom floor of a high-rise building does not exceed 15 Pa,the test result is more accurate;When the temperature difference between indoor and outdoor exceeds 6 K,and the pressure difference between indoor and outdoor on the bottom floor exceeds 10 Pa,the uncertainty of the test result is high.（3）This article has made a certain degree of improvement and perfection on the air-tightness test method of high-rise buildings,and put forward more scientific requirements for the air-tightness test method,measuring point requirements,and measuring point placement position of high-rise buildings,in order to provide references and suggestions for establishing the air-tightness evaluation standards of buildings suitable for our country.This article provides test examples and data support for the research on air-tightness of high-rise buildings,which has theoretical value and practical significance.There are 84 pictures,19 tables and 81 references.