建筑物空调系统可燃制冷剂泄漏浓度场分布  

Concentration distribution of leaking flammable refrigerants from building air-conditioning systems

作　　者：刘全义[1] 张辉[1] 刘奕[1] 李志鹏 

机构地区：[1]清华大学工程物理系,公共安全研究院,北京100084 [2]北京辰安伟业科技有限公司,北京100084

出　　处：《清华大学学报（自然科学版）》2013年第9期1326-1333,共8页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(70833003,91024032);

摘　　要：为研究建筑物空调系统中可燃制冷剂泄漏后的危险性,以丙烷为例,基于流体力学专业软件ANSYS Fluent采用数值方法模拟了水平方向和垂直方向不同位置抽气口作用对建筑物内泄漏丙烷以后的混合气体浓度场分布的影响规律;以爆炸极限为依据,分析了水平和垂直方向不同位置抽气口机械抽风对房间内丙烷浓度变化规律。结果显示:抽风作用可以将房间内混合气体中丙烷气体的浓度控制在爆炸下限范围内;只有泄漏口正下方很小一部分区域附近的可燃气体浓度会达到或者超过其爆炸下限。结果表明:制冷剂泄漏后在房间内的扩散分布受抽气影响很大,垂直方向抽气口位置越低,对于降低房间内丙烷气体浓度的效果越好;但是水平方向不同位置的抽气影响效果不是很明显。The risks of flammable refrigerants leaking from air conditioning systems were analyzed using CFD simulations to simulate horizontal and vertical lets on the propane concentration inside the room. The explosive limit is used as the criterion to analyze the e[fect of mechanical ventilation on the propane concentration variations. The results show that the propane concentration can be held below the explosive limit by mechanical ventilation, reaching or exceeding the explosive limit only very near the leaking orifice. The refrigerant concentration distribution after leakage is greatly affected by the exhaust, with lower exhaust locations more effectively reducing the propane concentration inside the room for vertical exhaust flows with less effect for horizontal exhaust vents.

关 键 词：可燃制冷剂 泄漏 空调系统 浓度分布 安全评估 

分 类 号：X932[环境科学与工程—安全科学]