遮阳方式及构造对室内自然通风的影响研究

Study on the Influence of Sunshade Methods and Construction on Indoor Natural Ventilation

遮阳方式及构造对室内风环境的营造有很大的影响,随着室内空气品质与热舒适要求的提高,室内自然通风越来越被重视。为了探究遮阳方式及构造对室内风环境的影响,以衡阳市某办公室为例,以计算机流体力学CFD(computational fluid dy-namics)技术为基础,分析了水平式、垂直式、综合式和挡板式遮阳板分别在400 mm、600 mm、800 mm、1000 mm和1200 mm长度下该办公室的进风量、测点风速和空气龄。当风向投射角为0°时,水平式、垂直式和综合式遮阳板长度每增加200 mm平均进风量分别增加135 m^(3)/h、110 m^(3)/h和125 m^(3)/h,挡板式板长每增加200 mm进风量平均减小365 m^(3)/h。通过对进风量、测点风速以及空气龄等评价指标的研究与分析,遮阳板对室内进风量影响较大,对室内空气流向和流速影响较小,合理利用各类遮阳板,可以达到改善室内自然通风的效果。

Sunshading methods and construction have a great influence on the creation of indoor wind environment,and with the improvement of indoor air quality and thermal com-fort requirements,indoor natural ventilation is more and more emphasized.In order to in-vestigate the influence of shading methods and construction on the indoor wind environ-ment,taking an office in Hengyang City as an example,the air intake,measured point wind speed values and air age of the office were analyzed based on CFD(Computational Fluid Dynamics)technology for horizontal,vertical,integrated and baffle shading panels at lengths of 400 mm,600 mm,800 mm,1000 mm and 1200 mm,respectively.When the wind projection angle is 0°,the average air intake of horizontal,vertical and integrated sunshade increases by 135 m^(3)/h,110 m^(3)/h and 125 m^(3)/h for every 200 mm increase in the length of the sunshade,and the average air intake of baffle-type board decreases by 365 m^(3)/h for every 200 mm increase in the length of the board.Through the study and a-nalysis of the evaluation indexes of the air intake,the measured point wind velocity and the indoor wind field,the impact of the sunshade on the indoor air intake is larger,and the impact on the indoor air flow direction and flow rate is less.The reasonable use of vari-ous types of sunshade,can achieve the effect of improving the indoor natural ventilation.