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Numerical modeling of thermal response of a ground heat exchanger with single U-shaped tube

机译：单元形管接地热交换器热响应的数值模拟

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摘要

Based on an experimental sandbox, this article analyzes the heat transfer processes of a ground heat exchanger (GHE) system when adopting two computational fluid dynamics (CFD) modeling approaches. First, the numerical model adopted the measurement recorded inlet temperature of the heat transfer fluid (HTF) as the GHE system input condition, and the predicted HTF outlet temperature was validated against the experimental data. Second, the GHE heating load initiated the numerical simulation, and the HTF outlet temperature was overpredicted by up to 2 degrees C (3.6 degrees F), especially for the late stage where discrepancy peaked. The heat transfer analysis showed the heat transfer efficiency of the GHE system adopting the second modeling approach was around 98.5%, due to multiple reasons, including experimental and numerical uncertainties during the tests. It demonstrates the significance of adopting proper thermal boundary conditions in numerical simulations, which can contribute toward the GHE system performance assessment and optimization in real practice.
机译：基于一个实验砂箱，本文在采用两种计算流体动力学（CFD）建模方法时分析了地面热交换器（GHE）系统的传热过程。首先，数值模型采用了传热流体（HTF）的测量记录入口温度作为GHE系统输入条件，并且预测的HTF出口温度验证了实验数据。其次，GHE加热负荷引发了数值模拟，HTF出口温度越过于2度C（3.6摄氏度），特别是对于截然达到峰值的晚期。传热分析表明，由于多种原因，采用第二次建模方法的GHE系统的传热效率约为98.5％，包括试验期间的实验和数值不确定性。它展示了在数值模拟中采用适当的热边界条件的重要性，这可以有助于实际实践中的GHE系统性能评估和优化。

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