摘要
随着建筑暖通空调的能源消耗问题日益严重,合理使用被动通风技术意义重大,捕风器作为一种传统的被动式通风结构,近年来在多国得到了广泛应用.本文基于计算流体力学CFD方法,预测了捕风器与窗户耦合的被动式通风房间的气流特征和换气效果,并通过实验测试验证了数值模型的有效性,测试结果和模拟结果吻合度较高,主要参数值的变化趋势一致.结果表明:在研究工况下,对于带四面开口捕风器的房间而言,在不同风向下包括窗户在内均只有一个风口进风,其余风口排风;窗户位于迎风侧时房间的换气次数最大,为其余工况的3倍以上;窗户位于迎风侧和背风侧时,新鲜空气在房间内的流通区域较大,送风效果较好;而当窗户位于侧风侧或捕风器单独工作时,新鲜空气呈现"短路"现象,送风效果不理想.该研究结果可以为捕风器在建筑中的使用提供参考依据,促进被动式通风结构的广泛应用.
With the worsening of building HVAC energy consumption problems,the utilization of passive ventilation technology has become increasingly significant.Wind catcher is a kind of passive ventilation structure,which is widely used in many countries in recent years.Based on computational fluid dynamics,the airflow characteristics and ventilation effect of a passive ventilation room when wind catcher and window work together was studied.Through experiment,the validity of the numerical model was verified,and the test results were highly consistent with the simulation results,and the variation trend of the main parameters was consistent.The finding shows that:there is only one vent introducing air at each wind direction for the room with wind catcher of four openings,and the other vents exhaust air;the room receives the most air when the window is on the windward side,which is more than 3 times that of other working conditions;when the window is on the windward or leeward side,the ventilation effect is better;when the window is on the crosswind side or the windcatcher works alone,there is“short circuit”phenomenon of fresh air,and the ventilation effect is poor.The results of this study can provide references for the application of wind catcher in buildings,promoting the extensive application of passive ventilation structures.
作者
吕维勋
吴妍
臧建彬
LYU Weixun;WU Yan;ZANG Jianbin(School of Mechanical and Energy Engineering,Tongji University,Shanghai 201804,China)
出处
《建筑科学》
CSCD
北大核心
2021年第6期137-142,149,共7页
Building Science
基金
上海市青年科技英才扬帆计划项目“典型城市街谷微环境和交通污染物迁移特性研究”(19YF1451100)
中央高校基本科研业务费专项资金项目“被动式通风结构在低层住宅中的研究应用”(22120180566)。
关键词
被动通风
捕风器
通风性能
实验测试
数值模拟
passive ventilation
wind catcher
ventilation performance
experimental test
numerical simulation
