太阳能烟囱通风效果的实验研究与数值模拟

Experimental Investigations and Numerical Analysis of Solar Chimney for Building Ventilation

实际测量华东地区某实验建筑中的太阳能烟囱通风量,所得结果与理论计算、数值模拟相比较,结果显示实际测量通风量普遍低于理论值。测量当日9∶15~13∶15时间段内太阳能烟囱垂直面上太阳总辐射强度为5~600 W/m2,实测风口的通风速率为0.02~0.45 m/s。通过数据分析得到实际工程中太阳能烟囱的流量系数Cd推荐值0.51。通过数值模拟研讨了太阳能烟囱结构尺寸对其产生自然通风量的影响,结果表明太阳能烟囱的高度与宽度均与太阳能烟囱通风量大小呈正相关,对于竖直式太阳能烟囱存在最佳高宽比0.3~0.4使其达到最大通风量。

Based on experimental investigations of a solar chimney in East China, the results of theoretical calculation and numerical simulation were compared. The results show that the actual measurement of ventilation rate is generally lower than the theoretical value. Intensity of solar radiation on the vertical surface in 9：15 - 13：15 period of the day was 5 -600 W/m^2 , and the measured ventilation rate was 0. 02 -0. 45 m/s. This study suggests the discharge coefficient of solar chimney be 0.51 in project. Numerical simulation indicates that the size of a solar chimney has an influence on natural ventilation, i.e. ventilation rate grows when the height or width of the solar chimney increase. For the vertical type of solar chimney, it has the best height-to-width ratio of 0.3 - 0.4 to achieve a great ventilation rate.