流体加热道路融雪系统的设计热负荷

摘要

为了提高流体加热道路融雪系统设计的可靠性，开展了流体加热道路融雪系统设计热负荷的研究。基于自行开发的道路融雪系统融雪模型，采用数值仿真分析方法探讨了系统运行参数、环境参数等因素对系统融雪效果的影响；在此基础上，依据我国气候特点开展了流体加热道路融雪系统设计热负荷的探讨。研究表明：预热时间、单位面积输入热负荷、道路材料、埋设管材显著影响降雪开始时刻道路结构温度场、单位面积输入能量、沿程能量损失、热量传递到上表面所需时间及热量传递能力，因此，可通过调整系统运行参数及道路设计参数达到优化融雪效果的目的；另一方面，地点不同达到相同融雪效果所需热负荷不同。依据我国降雪分布特点及近30 a气象数据，提出了针对我国不同地区的流体加热道路融雪系统设计热负荷参考值，为今后我国流体加热道路融雪系统的设计提供依据。%To improve the design reliability of hydronic snow melting system, design alternative of hydronic snow melting systems for pavement in China is discussed. Based on the heat and mass coupled snow melting model, the effect of idling time, heat fluxes, pipe material, meteorological condition and control strategy on the snow melting performance has been investigated. The design alternative for hydronic snow melting system also has been proposed. Results indicated that idling time, input heat flux, thermal properties of pavement materials and embedded pipe play an important role on snow melting performance. Thus, it is possible to adjust the operation parameters and pavement design parameters to optimize the snow melting performance. Meanwhile, location and target performance also affect the required design alternative. According to the weather data corresponding to snow event from 1981 to 2010, the required heating load for hydronic snow melting system in China is suggested. The proposed heating load will give a lot of suggestion in the designation of hydronic heated system for pavement in China.