流体加热道路融雪系统温-湿耦合融雪模型

Heat and Moisture Coupled Snow Melting Model for Hydronic Heated Pavement

为准确分析流体加热道路融雪系统融雪特性,综合考虑融化雪水在道路结构中的传递对道路材料热物理性质的影响,建立了流体加热道路融雪系统温-湿耦合融雪模型;基于试验数据验证了融雪模型的准确性,揭示了融化雪水在道路结构中的传递对融雪过程的影响;在此基础上,采用仿真分析的方法建立了系统融雪过程运行控制图,并提出了融雪系统运行策略,为流体加热道路融雪系统的运行过程控制提供参考。研究结果表明:建立的温-湿耦合融雪模型可准确模拟实际融雪的各个环节;温-湿耦合融雪模型与温度场单场模型对融雪过程预测精度的差别主要体现于融雪时间及融后过程路表温度变化2个方面;融化雪水在道路结构中的传递显著改善了路表附近道路材料的热量传递能力;等效降雪速率和单位面积输入热负荷是影响融雪特性的最主要因素。

For the purpose of analyzing the snow melting performance of hydronic heated pavement, a snow melting model coupling the thermal and hydraulic process was developed with the consideration of the effect of melted snow on thermal properties of pavement material. The snow melting model was evaluated using measured data from large scale field snowmelting experiments. The role of melted moisture transfer to the pavement for snow melting was discussed. By means of this model, control chart for snow melting period was developed, and operation strategy for hydronic snow melting system was suggested to provide reference in the operation of hydronic heated system for pavement. The results show that the model is capable of providing good simulation of snow melting process. The prediction difference between the heat and moisture coupled snow melting model and heat snow melting model lies in melting time and surface temperature change after snow melting process. Melted snow transfer to the pavement improves heat transfer of pavement material near the surface significantly. Equivalent snowfall rate and thermal input in unit area are two main factors which influence snow melting.