作　　者： ; ;

机构地区： 河北工业大学能源与环境工程学院

出　　处： 《太阳能学报》 2010年第1期17-21,共5页

摘　　要： 建立了地热能道路融雪过程的理论预测模型,其中考虑了雪层的毛细作用与热质交换特性。对融雪过程中临界融化面积比现象的产生机理进行了深入分析。结果表明,临界融化面积比不随加热流体温度、环境条件以及埋管布置(埋深和间距)等因素而变化,是由埋管布置本身导致的不均匀路面热流以及雪层本身的多孔特性二者共同作用的结果。与加热流体温度相比,埋管布置和待融时间对融雪时间的影响更大,是融雪系统优化设计的最重要因素。 A theoretical model to predict the snow-melting process on pavement was presented, and the capillary effect and heat-transfer behaviour of snow were considered. The mechanism of critical free-area ratio （CFR） during the snow- melting process was revealed. Results showed that CFT{ is independent on the fluid temperature, ambient conditions, and the layout of pipes. It is both the non-uniform temperature distribution on pavement and complicated porous structure of snow that lead to the occurrence of CFR. Compared with the fluid temperature, the layout of pipes and the idling time have a more important effect on the melting time. This result is helpful to the optimal design of snow-melting systems.

关 键 词： 地热能 道路融雪 临界融化面积比 毛细作用

领　　域： [动力工程及工程热物理] [动力工程及工程热物理]