中文摘要：

外墙的热工性能对于建筑外围护结构传热具有重要的影响,本文采用CFD数值模拟的方法对空心砌块通风墙体热工性能进行了研究。分析了在24 h及8：00~20：00空调运行模式时,不同空腔厚度及不同空气流速时通风墙体的内表面热流及温度,并与相同空腔厚度空心砌块普通墙体进行了对比。结果表明：空心砌块墙体内通风可降低墙体内表面的温度和热流。与普通空心砌块墙体对比,当空调24 h运行且空腔内流速为1 m/s时,厚度为80 mm、100 mm和120 mm的空心砌块通风墙体内表面热流分别降低39.1%、37.8%和36.1%;当空腔内流速为2 m/s时,内表面热流分别降低48.7%、48.0%和47.0%;当空调8：00~20：00运行且空腔内流速为2 m/s时,内表面热流分别降低29.6%、33.7%和31.3%。该结论可为空心砌块通风墙体的应用及优化设计提供依据。

英文摘要：

Thermal performance of external wall had an important effect on heat transfer of building envelope. In this paper, the thermal performance of the hollow block ventilation wall was investigated by a CFD numerical simulation method. Internal surface temperature and heat flux of the ventilation wall with different cavity thicknesses and air flow rates were also studied under the 24 h and 8：00 ~20：00 air conditioning respectively, and they were compared with the normal hollow block wall. Results showed that the air flow through the cavity of hollow block wall could reduce the internal surface temperature and heat flux. Compared with the normal hollow bock wall, when the air-conditioner was 24 h working and the air flow rate was 1 m/s, the internal surface heat fluxes of the hollow block ventilation wall with the cavity thicknesses of 80 mm, 100 mm and 120 mm could be reduced by 39. 1% , 37.8% and 36.1% respectively; by contrast, if the air flow rate became 2 m/s, those were otherwise reduced by 48.7% , 48.0% and 47.0% separately. In the case that the air-conditioner ran 8：00 -20：00 and the air flow had a rate of 2 m/s, they could be reduced by 29.6% , 33.7% and 31.3%. Such results provided the references for application and optimal design of the hollow block ventilation wall.