A numerical study on the effect of column layout on air distribution and performance of column attachment ventilation

作     者：Haiguo Yin Linna Li Rui Wu Yuanyuan Wang Angui Li Haiguo Yin;Linna Li;Rui Wu;Yuanyuan Wang;Angui Li

作者机构：School of Building Services Science and EngineeringXi’an University of Architecture and TechnologyShaanxiXi’an710055China 

出 版 物：《Building Simulation》 (建筑模拟（英文）)

年 卷 期：2021年第14卷第4期

页      面：1095-1108页

核心收录：

学科分类：08[工学] 081404[工学-供热、供燃气、通风及空调工程] 0814[工学-土木工程] 

基　　金：This study was jointly funded by the National Natural Science Foundation of China(No.51408477) the Innovative Talent Promotion Plan of Shaanxi Province(No.2018KJXX-087) and the Youth Talent Support Project of Xi’an Association for Science and Technology 

主　　题：column attachment ventilation air distribution column layout performance evaluation large space buildings 

摘      要：Based on the structural characteristics of existing buildings and the disadvantages of current mixed ventilation mode in the application to large space buildings,an original column attachment ventilation(CAV)has been *** this study,the experiment utilized a room space with four columns uniformly distributed in the space to visualize the movement of attached airflow along the cylinder surface and the floor,the numerical technique was employed to study the effects of the column layout(i.e.,uniform,centralized,dispersed,and crossed distribution)on the air distribution of CAV mode in a standard four-column full scale model of a shopping *** indices,including airflow pattern,air diffusion performance index(ADPI),air temperature distribution,heat removal effectiveness,draught rate(DR),predicted mean vote(PMV),and carbon dioxide(CO2)concentration,were used to assess the ventilation *** the CAV mode with a uniform column layout scheme,the experimental results indicated that the air supply flows downward along the wall surface,forming a secondary attachment with the ground and spreading along the floor in a fan radiation flow ***,an“air lake-like speed and temperature distribution similar to displacement ventilation(DV)was formed in the occupied *** all simulation cases,it was found that the average air velocity was less than 0.25 m/s in occupied zone,the effectiveness for heat removal was more significant than 1.0,DR value was less than 20%,the PMV level can also satisfy most *** average CO2 concentration was around 470 ppm in the occupied breathing *** results indicated that the CAV mode could be an efficient air distribution *** demonstrated the technical feasibility of applying the CAV in the space under different column layout schemes.