弧形通风气楼在钢结构厂房中的设计与应用

弧形通风气楼根据流体力学原理实现建筑物自然通风。弧形通风气楼的结构形式采用直接传导式,通过其在某窑炉单层钢结构厂房中的应用,体现了弧形气楼在结构上优化了原结构中的天窗骨架支撑托梁,节约了成本;在施工上采用工厂构件式标准化生产,保证了产品质量,在功能上极大改善了车间采光和通风效果。

彩钢板自然通风气楼

结合工程实例,介绍了屋面彩钢板自然通风气楼的应用范围、工作原理、结构特点及施工顺序,提出了施工中应注意的事项,并对其经济效益进行了分析,可供类似工程参考。

基于CFD模拟的某柔直换流站户内启动回路场自然通风方案研究

[目的]电网工程采用全户内紧凑型布置是当前国内城市电网建设大力发展形势下的必然趋势。如何将室内设备产生的大量热量散发出去,且减少对周围环境产生不利影响,是一项值得深入研究的课题。自然通风作为经济高效、无噪声产生的通风方案应优先考虑采用。为研究不同气楼方案对户内启动回路场自然通风的影响,在其他条件不变的情况下,通过改变气楼位置及形式,对广州市某直换流站工程户内启动回路场的散热效果进行对比分析。[方法]采用CFD数值模拟方法,针对流线型通风器和薄型通风器工况,模拟了厂房内气流的温度场和速度场。[结果]模拟结果显示,采用自然通风方案可行。且流线型气楼相比于薄型气楼,增大了气楼的有效通风面积,优化了室内空气流场,可将户内直流场内部环境温度多降低约2℃,可在相同环境温度下达到更好的整体降温效果。[结论]验证了自然通风散热方案在户内直流场启动回路通风系统应用的可行性,表明流线型气楼通风散热的效果在特定环境中要优于薄型气楼,可为以后类似直换流站工程的通风散热方案选择及气楼优选提供参考和依据。

A Predictive Nighttime Ventilation Algorithm to Reduce Energy Use and Peak Demand in an Office Building

The effect of two nighttime ventilation strategies on cooling and heating energy use is investigated for a prototype office building in several northern America climates, using hourly building energy simulation software （DOE2.1E）. The strategies include： scheduled-driven nighttime ventilation and a predictive method for nighttime ventilation. The maximum possible energy savings and peak demand reduction in each climate is analyzed as a function of ventilation rate, indoor-outdoor temperature difference, and building thermal mass. The results show that nighttime ventilation could save up to 32% cooling energy in an office building, while the total energy and peak demand savings for the fan and cooling is about 13% and 10%, respectively. Consequently, finding the optimal control parameters for the nighttime ventilation strategies is very important. The performance of the two strategies varies in different climates. The predictive nighttime ventilation worked better in weather conditions with fairly smooth transition from heating to cooling season.