Energy Transfer Mechanism of Geothermal Energy Piles for Bridge Deck De-icing
The utilization of geothermal energy piles for bridge deck de-icing(hereinafter referred to as bridge energy piless)can extract clean geothermal energy and transmit it to the bridge deck for de-icing and snow melting in winter.A three-dimensional numerical model of thermo-mechanical coupling of bridge energy piles was established,and the influence of convective heat transfer at bridge piers on the energy transfer mechanism of lower energy piles was investigated.The study showed that the geothermal extraction efficiency of the energy pile in the de-icing process was 2-3 times that of the traditional geothermal borehole;the convective heat exchange between the bridge abutment and the air would lead to heat dissipation,resulting in a reduction of the thermal power of the energy pile;when the length ratio of the bridge abutment pile base was increased from 0 to 50%,the heat exchange rate of the energy pile was reduced by about 8.7%for each extension meter of the bridge,therefore the influence of the convective heat exchange of the bridge abutment on the thermal performance of the energy pile should be taken into account when the bridge abutment is long.
bridge energy pilethermal convection of pierheat transfer performanceair velocitypier-pile length ratio
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