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首页> 外文期刊>International journal of green energy >A NUMERICAL MODEL FOR THE SIMULATION OF A VERTICAL U-BEND GROUND HEAT EXCHANGER USED IN A GROUND-COUPLED HEAT PUMP
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A NUMERICAL MODEL FOR THE SIMULATION OF A VERTICAL U-BEND GROUND HEAT EXCHANGER USED IN A GROUND-COUPLED HEAT PUMP

机译：地面热泵中垂直U型弯管地面换热器的数值模型

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摘要

Heat transfer between the ground heat exchanger (GHE) and surrounding soil is a common problem for the optimum design and simulation of ground-coupled heat pump (GCHP). In this article, a quasi-three-dimensional numerical model of vertical U-bend GHE was proposed and developed by coupling the one-dimensional model of fluid in the depth direction with the two-dimensional heat transfer model of soil in the level direction but considering the soil temperature variation along depth. In the model, the soil in depth direction was divided into saturated and unsaturated regions by water table, and the influence of groundwater advection on the heat transfer performance of GHE was considered for the saturated soil region. Based on the model, the variations of heat rejection and fluid outlet temperature of GHE with time were discussed, and the influences of soil thermal properties and groundwater advection on the heat transfer performance of GHE were analyzed. The results show that the heat rejection in cooling mode will decrease with time, and an intermittent heat rejection mode can improve the heat transfer performance. Meanwhile, the increases of soil thermal conductivity and heat capacity can all enhance the heat transfer characteristics, and the exist of groundwater advection can improve the heat exchange between the GHE and surrounding soil Furthermore, an experimental validation was performed in a solar-geothermal multifunctional heat pump experiment system. The results indicate the predicted values of heat rejection rate of GHE are agreed well with the corresponding measured data, and the guess average relative error for the daily heat rejection is about 5.5%. This means the numerical model proposed in this article is feasible and thus can be used to simulate the heat transfer of GHE.
机译：对于地面耦合热泵（GCHP）的最佳设计和仿真，地面热交换器（GHE）与周围土壤之间的热传递是一个常见问题。本文通过将深度方向上的流体一维模型与水平方向上土的二维传热模型耦合起来，提出并开发了垂直U形弯管GHE的准三维数值模型。考虑土壤温度沿深度的变化。在模型中，通过地下水位将深度方向上的土壤分为饱和区和非饱和区，并考虑了地下水对流对GHE传热性能的影响。在此模型的基础上，探讨了GHE的排热和出水温度随时间的变化，分析了土壤热性质和地下水平流对GHE传热性能的影响。结果表明，冷却模式下的散热量会随着时间的流逝而减少，而间歇性的散热模式可以提高传热性能。同时，土壤热导率和热容量的增加都可以增强传热特性，地下水对流的存在可以改善GHE与周围土壤之间的热交换。此外，在太阳地热多功能热力中进行了实验验证。泵实验系统。结果表明，GHE的排热率预测值与相应的实测数据吻合良好，日排热的猜测平均相对误差约为5.5％。这意味着本文提出的数值模型是可行的，因此可用于模拟GHE的传热。

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