外呼吸幕墙夏季通风散热效果测试分析

Test and analysis of ventilation and heat dissipation efficiency of external respiration double-skin facade

以广州市某项目的外呼吸玻璃幕墙为研究对象,分别对室外平均风速、室外侧玻璃外表面平均温度、室外侧玻璃内表面平均温度、热通道内的平均风速、进风口空气温度、出风口空气温度进行连续监测,分析计算其通风除热效率。结果表明:测试工况下的通风除热效率最高为37.07%、最低为4.48%、平均为19.74%。测试结果波动较大,主要原因是热通道内气流的流动不平稳、风速变化大,导致风量变化大。与理论模拟值相比,实际测得的通风除热效率值偏低,可能原因是进风口附近可能存在局部回流区,不利于热空气的快速排出,阻碍了热通道的通风散热速度。

Taking the external respiration double-skin facades of a project in Guangzhou as the research object, the average wind speed, inner and outer surface temperature of the outdoor side glass, wind speed of the air inside the heat channel, and the inlet and outlet air temperature was continuously tested, so as to calculate the ventilation and heat dissipation efficiency. The results showed that the highest ventilation and heat dissipation efficiency under test conditions was 37.07%, the lowest was 4.48%, and the average was 19.74%. The test results fluctuated greatly, mainly due to the unsteady flow of air flow in the thermal channel, and the large variation of wind speed, which led to the large variation of air volume. Compared with the theoretical simulation value, the actual measured ventilation and heat dissipation efficiency is relatively low, probably because there is a local recirculation zone near the inlet, which is not conducive to the rapid discharge of hot air, and prevents the ventilation and heat dissipation speed of the heat channel.