Abstract In the present paper, a new hybrid model for transient heat transfer in Earth-Air Heat Exchangers (EAHE) based on thermal resistance capacity circuit is developed. To evaluate the performance of the EAHE, part of the solution field (soil around the pipe) is analytically solved. To assess the heat transfer in pipe and within the fluid inside the pipe, the solution field is divided into different layers. Using a capacity resistance network, the governing equations in the form of Ordinary Differential Equations (ODE) are derived and then coupled with analytical portion are solved by numerical discretization. In the current model, the effect of the thermal capacity of the soil around the pipe is taken into account in the simulation. Thus, using the proposed model, the thermal saturation of the soil is captured. Moreover, the effect of the variation of ambient temperature is considered on the heat exchanger performance. Ultimately, the results of the presented model are compared with experimental and numerical ones, and acceptable agreement is observed. Using the model, then, the effect of buried depth, fluid velocity, and the operation strategies of the system (continuous or intermittent) is investigated on the performance of the EAHEs.

中文翻译：

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地气换热器瞬态模拟的热阻容量模型

摘要 在本文中，基于热阻电容电路开发了一种新的地-气换热器（EAHE）瞬态传热混合模型。为了评估 EAHE 的性能，对部分求解场（管道周围的土壤）进行了解析求解。为了评估管道内和管道内流体的传热，求解场被分为不同的层。使用容量电阻网络，导出常微分方程（ODE）形式的控制方程，然后结合解析部分通过数值离散化求解。在当前模型中，在模拟中考虑了管道周围土壤热容量的影响。因此，使用所提出的模型，可以捕获土壤的热饱和度。而且，考虑环境温度变化对换热器性能的影响。最后，将所提出模型的结果与实验和数值结果进行比较，并观察到可接受的一致性。然后，使用该模型，研究埋藏深度、流体速度和系统运行策略（连续或间歇）对 EAHE 性能的影响。