Abstract Hydronic heating systems with geothermal heat exchangers are one of the innovative methods for bridge deck deicing in winter, which avoids infrastructure corrosion and environmental pollution caused by chemical methods. This paper focused on field tests of the thermal performance of a bridge deck with a hydronic heating system under heating conditions. The inlet fluid temperatures were kept constant to study the transient heat flux through outlet fluid temperatures under different ambient temperature conditions. Three different inlet fluid temperatures of 30.5 °C, 35.5 °C, and 41.0 °C were considered in the field test. The objective of this paper is to study the influences of the air temperature, slab temperature, and inlet fluid temperature on the heat exchange flux and the thermally induced stresses due to heating. The results indicate that the inlet fluid temperature should be controlled above 2.3 times the absolute value of the air temperature to keep the slab surface temperature above 0 °C when the air temperature is below 0 °C. The thermally induced stresses caused by operating the system are smaller than 5% of the strength of the concrete, which are negligible.

中文翻译：

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带循环加热系统的桥面板热性能试验

摘要 地热换热器水力供暖系统是冬季桥面除冰的创新方法之一，可避免化学方法造成的基础设施腐蚀和环境污染。本文着重于在加热条件下对带有循环加热系统的桥面板的热性能进行现场测试。入口流体温度保持恒定，以研究在不同环境温度条件下通过出口流体温度的瞬态热通量。在现场测试中考虑了 30.5 °C、35.5 °C 和 41.0 °C 三种不同的入口流体温度。本文的目的是研究空气温度、板坯温度和入口流体温度对热交换通量和加热引起的热应力的影响。结果表明，当气温低于0℃时，入口流体温度应控制在气温绝对值的2.3倍以上，才能使板坯表面温度保持在0℃以上。系统运行引起的热应力小于混凝土强度的 5%，可以忽略不计。