【摘要】 采用CFD模拟方法,分析夏季工况下对室内排风进行再利用的主动通风式高效保温隔热外墙的传热过程,并对墙体内空气间层的速度与温度分布展开讨论.比较研究了不同空气间层通风量与外墙面温度对墙体隔热性能的影响.结果表明:该墙体具有很好的隔热特性,运行过程中能通过流动空气层带走90%以上的传入热量;同时空气间层能有效降低内侧墙体温度,利于减小室内墙面热辐射,改善室内舒适度;增大墙体通风量能显著提高墙体热阻,增强墙体隔热性能.通过拟合分析得到了空气间层平均风速与墙体热阻值的线性回归方程.更多还原

【Abstract】 The heat transfer performance of a forced ventilated thermal insulating wall was simulated and analyzed in which the indoor exhaust is utilised. And air flow velocity and temperature in the cavity of the wall are discussed as well. The influence of different ventilation rate of the air cavity and different temperature of the outer wall surface on the heat insulation performance of the wall is analyzed. The results indicate that the wall show high performance in heat insulation, the flow air in cavity can take away more than 90% of the heat quantity transferred from outside under the summer working mode. Meanwhile the flow air in cavity can reduce the temperature of the inner layer of the wall effectively which can contribute to decreasing the thermal radiation of the indoor wall surface and improving the indoor thermal amenity. Thermal resistance of the wall increases with the ventilation rate, which is beneficial for improving the performance of the wall. And a linear relationship between the average velocity of the air in cavity and the thermal resistance of the wall is obtained through fitting method.更多还原