太阳能烟囱强化自然通风的动态特征研究

摘要

针对三种太阳能烟囱结构形式，借助数值模拟方法研究了在全天玻璃表面与集热板热流强度动态变化条件下太阳能烟囱自然通风的通风量变化、室内热环境和空气流动特征。研究结果表明，玻璃表面和集热板热流强度的增大将促使通风量的提高，而竖直式太阳能烟囱自然通风量增加最明显；同时，自然通风量随热流强度的变化存在延迟，而竖直式太阳能烟囱延迟时间最短；此外，竖直式和倾斜式太阳能烟囱自然通风的室内温度存在分层，而合理的自然通风进风口位置有利于优化气流流动。%For three kinds of solar energy chimney, airflow variation, indoor thermal environment and air flow characteristics of natural ventilation with solar energy chimney were studied based on numerical simulation, under condition that heat flow intensities of solar energy chimney glass surface and roof were dynamically changing in one whole day. The results show that increase of glass surface and roof heat flow intensities makes ventilation airflow rise and that of vertical solar energy chimney has the most obvious increase. Meanwhile, there exists delay for variation of natural ventilation airflow with heat flow intensity and the delay time of vertical solar energy chimney is the shortest. In addition, indoor temperature has layering for natural ventilation with vertical and tilted solar energy chimneys and reasonable location of natural ventilation inlet is benefit for optimizing airstream flow.