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.