Thermal Performance Analysis Of Heat Collection Wall In High-rise Building Based On The Near-wall Microclimate

A great economic development environment has made our country’s population and urbanization rate have grown steadily since the beginning of the 21 st century.The followed problems of energy and environmental have severely restricted the survival of the people and the sustainable development of society.The green development strategy of "carbon peak" and "carbon neutral" puts forward new requirements on the pattern of energy supply and demand,aiming at increasing the proportion of renewable energy.Among them,the maximum development and utilization of clean solar and wind energy has become the key to achieve the target of "carbon peak" in " the 14 th Five-Year Plan " period in advance.At present,building energy consumption accounts for about 30% of the total social energy consumption in China and continues to increase with the improvement of urbanization level and urban residents’ pursuit of comfortable indoor building environment.To promote the integration of solar energy utilization and building on the basis of passive solar technology,it is necessary to consider the changes in parameters such as wind speed,wind temperature,relative humidity,and solar radiation near the outer wall of the building.Based on the differential near-wall micro-climate characteristics of high-rise buildings,it is of great significance to effectively realize the heating and ventilation of solar collecting wall,which is of great significance to relieve the pressure caused by the transformation of energy structure and promote the development of green buildings.Based on this,this paper,as an important part of the National Natural Science Foundation project "Research on Heat and Wet Transfer Characteristics and Conjugate Heat Transfer Mechanism of Multi-channel Heat Collection Wall under Compound Flow Field"(No:51808506),takes the heat transfer characteristics of heat collecting wall in high-rise building as the research object,and the following work has mainly carried out:(1)Three high-rise buildings were selected as the research object in Zhengzhou,and the microclimate of the south facade in winter and summer were measured respectively,and the variation rules of solar radiation,outdoor temperature and humidity,attached airflow,etc.with the lifting of the building exterior wall were summarized.(2)A mathematical model of solar energy collection hot wall was established,MATLAB software was used for programming and numerical calculation,corresponding with the actual working condition as the outdoor environment,and the heat transfer performance of solar heat collecting wall and air distribution inside the wall in different near-wall microclimate were explored to provides the reference for the combination of solar energy collection hot wall and prefabricated construction;(3)On the basis of numerical calculation,Fluent is used to carry out numerical simulation for relevant optimization design,and a reasonable structural design method is proposed,which provides theoretical support for the adaptive design of solar heat collecting wall in high-rise buildings.The research of this paper is a useful exploration to promote the integration of passive solar heat technology and high-rise buildings in the the third-level area of solar energy resources in China.The micro-climate change law near the wall of the building summarized in the study provides a theoretical basis for further rationalizing the design scheme of the heat-collecting wall structure and strengthening the efficiency of solar heating and ventilation.