地板辐射供冷系统的数值模拟  

NUMERICAL SIMULATION OF RADIANT FLOOR COOLING SYSTEM

作　　者：金星 张小松 曹熔泉 曹毅然 

机构地区：[1] School of Energy and Environment, Southeast University, Nanjing 210096, China

出　　处：《太阳能学报》2010年第6期732-737,共6页Acta Energiae Solaris Sinica

基　　金：国家科技支撑计划项目(2008BAJ12B02);东南大学优秀博士学位论文基金(YBJJ0814)

摘　　要：建立了复合介质地板辐射供冷的数学模型,利用有限容积法对地板层温度场进行了数值模拟。模拟结果表明:地板总热流中对流热流所占比例较小,自然对流下,对流热流占总热流的8%～11%,而通风下占11%～15%;相比于自然对流,通风可以提高对流热流35%以上,但由于室内舒适性对风速的限制,而且对流热流在总热流中所占比例也较小,同时由于通风引起地板表面温度升高,辐射热流减少,因此地板辐射供冷能力增加很小;由于舒适性及结露等条件的限制,地板辐射最大供冷能力约为50W/m^2,因此对于某些冷负荷较大的房间,还需采用其它的辅助供冷方式。A mathematic model of the composite material radiant floor cooling system was built in this paper; the temperature field of the floor was obtained by the finite volume method. The simulation results showed that the proportion of convective heat flux in total heat flux was small; it is about 8%-11% and 11%-15% in the situation of natural convection and mixed convection, respectively. Compared with natural convection, the convective heat flux could be enhanced by 35% in the situation of mixed convection. However, because the air velocity was restricted by thermal comfort, the convective heat flux took up only a small part in total heat flux, and the radiant heat flux decreased as the floor surface temperature rose in the situation of mixed convection, the increase of the cooling capacity is little. Considering the thermal comfort and condensation, the maximum cooling capacity of the radiant floor was about 50 W/m2, so another assistant cooling system was needed for the room which had larger cooling load.

关 键 词：地板辐射供冷 供冷系统 数值模拟 辐射热流 自然对流 供冷能力 通风 舒适性 有限容积法 限制 温度升高 数学模型 模拟结果 供冷方式 复合介质 温度场 冷负荷 条件 室内 结露 

分 类 号：TK511-55[动力工程及工程热物理—热能工程]