在利用浅层地热能流体加热技术为机场道面融雪化冰时,因传统埋管方案埋深较浅难以和机场道面施工结合,且在换热时会在道面结构内引起较大的温度应力,因此该文提出一种将管道铺设于面层和基层的交界处的新型埋管方案,以提高施工便利性、减小面层混凝土中的温度应力。建立COMSOL Multiphysics三维有限元数值模型,重点比较其在传热规律和融雪性能上与传统方案的差异,并分析入口温度和流速对融雪效果的影响。结果表明,新方案可有效利用浅层地热能提高路表温度,有效传热率为85.9%,融雪效果较好;新方案温度梯度仅为传统方案的40%,温度分布更均匀,可降低温度应力而减小路表开裂的风险;提高入口温度可有效提升融雪效果,而流速对传热性能和融雪效果的影响较小。
Abstract
When the shallow geothermal hydronic heating technology is applied for snow-melting and deicing, it is difficult to install the pipes inside the airport runways pavement, and the heat transfer can cause high temperature stress. A novelty scheme to embed the pipes at the junction of the surface layer and the base layer is proposed to improve the construction convenience and reduce the temperature stress in surface concrete. A 3D numerical model in COMSOL Multiphysics software is established to compare the heat transfer process and snow-melting performance between the traditional and proposed pavements. Then the influences of the inlet temperature and flow rate on snow-melting efficiencies are analyzed. The results show that the proposed pavement can effectively utilize the shallow geothermal energy to improve the surface temperature, and the effective heat transfer rate is 85.9%. The temperature distribution is more uniform with a low temperature gradient which is only 40% of that of the traditional scheme, reducing the temperature stress and risk of cracking. The snow-melting performance can be improved by increasing the inlet temperature, but it is less affected by the flowrate.
关键词
传热性能 /
地热能 /
机场跑道 /
融雪化冰 /
流体加热技术
Key words
heat transfer performance /
geothermal energy /
airport runways /
snow and ice removal /
hydronic heating
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