考虑建筑房间内导热辐射与自然对流耦合时外围护结构对对流换热的影响  

INFLUENCE OF BUILDING ENVELOP ON NATURAL CONVECTION AND HEAT TRANSFER WHEN CONSIDERING INDOOR HEAT TRANSFER AND RADIATION COUPLED IN NATURAL CONVECTION

作　　者：战乃岩[1,2] 徐沛巍[2] 

机构地区：[1]上海理工大学动力学院,上海200093 [2]吉林建筑工程学院环境与设备工程学院,长春130118

出　　处：《太阳能学报》2011年第4期501-507,共7页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(50576057);上海市教委发展基金(05EZ18)

摘　　要：对具有导热和表面辐射换热相互耦合的建筑房间内的自然对流进行了数值研究。计算采用层流模型,为SIMPLE算法,QUICK差分格式。计算结果表明,辐射参与换热对流动将产生显著影响,会使房间内形成二次涡流。在自然对流的房间内,辐射换热比对流换热更占主导地位。当具有外围护结构时,导热效应使总对流换热有所增长(曲线的初始部分),但当导热系数比超过一定值时(kr≥10),再增加固体的导热性能,对房间内的流动和换热的影响就不明显了。从数值上证实了在实际建筑环境中,只要外围护结构的厚度达到一定数值就可达到隔热保温的要求。再增加厚度并不会得到更好的效果。Numerical investigation for indoor natural convection and heat transfer with building envelop was conducted using SIMPLE algorithm and QUICK scheme. The results suggest that flow and heat transfer are influenced by radiation. There is secondary flow in the room. Radiation is dominant action on flow and heat transfer. With increase of the thermal conductivity of building envelop, flow and heat transfer turn stronger. The temperature distribution changes obviously. When the thermal conductivity of building envelop is over some critical value, it can be found that the increasing trend of flow and heat transfer may be skipping. With increase of the thickness of building envelop, flow and heat transfer turn slighter. When the thickness of building envelop is over some critical value, it can be found that flow and heat transfer will turn slow.

关 键 词：建筑房间 自然对流 外围护结构 耦合 数值计算 

分 类 号：TK124[动力工程及工程热物理—工程热物理]