Trombe墙通道内浮力诱导室内通风的特性分析

ANALYSIS OF BUOYANCY-INDUCED AIRFLOW IN TROMBE WALL CHANNELS

为了对Trombe墙通道内浮力诱导气流流动的特性进行深入分析,采用实验研究与数值模拟的方法,对带有Trombe墙的二层建筑通道内的流动特性进行分析。结果表明:当Trombe墙太阳能烟囱吸收太阳能后,强化了室内通风,建筑室内的通风量随太阳辐射强度的增加而增加;以一天运行为例,建筑下层的通风量比上层增加41%~56%。烟囱通道内的格拉晓夫数(Gr)随太阳热流密度的增加而迅速增加,且一楼气流的Gr和Ra(瑞利数)均大于二楼,导致在Trombe墙作用下,建筑一楼的通风量大于二楼。为了增加二楼室内的通风量,应最大程度地增加太阳能通道内的Gr和Ra。

In order to analyze the characteristics of buoyancy-induced airflow in the channel of the Trombe wall,the flow characteristics in the two-story building channel with the Trombe wall were analyzed by experimental research and numerical simulation.The results show that the solar chimney of the Trombe wall strengthens the indoor ventilation by absorbing solar energy.The ventilation volume increases with the increase of the solar radiation intensity,and the ventilation of the lower layer is increased by 41%to 56%over the upper layer in a day.The Gr number in the chimney channel increased rapidly with the increase of the solar heat flux,and the Gr number and Ra number of the lower floor of the building were larger than the upper floor,which results the ventilation of the lower floor of the building being higher than the upper floor.In order to increase the ventilation of two-story building,the number of Gr and Ra in the solar chimney channel should be increased as much as possible.