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A new approach to modelling of seasonal soil temperature fluctuations and their impact on the performance of a shallow borehole heat exchanger
Case Studies in Thermal Engineering ( IF 6.8 ) Pub Date : 2020-11-04 , DOI: 10.1016/j.csite.2020.100781
Sarwo Edhy Sofyan , Eric Hu , Andrei Kotousov , Teuku Meurah Indra Riayatsyah , Khairil , Hamdani

A borehole heat exchanger (BHE) could be used in heating and cooling systems as the ground temperature is normally higher than the average air temperature in winter and lower in summer. This difference in the temperature can be used to improve the efficiency of air conditioning systems (in summer) and heat pumps (in winter). The performance of a BHE is influenced by soil temperature that may have significant seasonal changes. These changes were largely ignored in previous BHE modelling approaches being a source for large errors in theoretical predictions. This paper presents a new internal source term approach to account for the (seasonal) fluctuation in soil temperature on a shallow BHE's performance. The proposed model is able to consider the heat flow in multi-ground-layers. The governing equations of the model are solved by using explicit finite different method. The model is validated using experimental data. The simulated soil temperatures with and without the internal heat source term showed that the maximum relative errors are 3.7% and 14% respectively. The use of high thermal conductivity grout resulted in a decrease in the borehole thermal resistance. The outlet fluid temperature under the continuous operation mode is higher than that operated under the intermittent mode.



中文翻译:

一种模拟季节性土壤温度波动及其对浅井换热器性能影响的新方法

钻孔换热器(BHE)可用于加热和冷却系统,因为地面温度通常高于冬季的平均气温,而夏季则低于平均气温。温度的这种差异可用于提高空调系统(夏季)和热泵(冬季)的效率。BHE的性能受到土壤温度的影响,土壤温度可能会发生明显的季节性变化。这些变化在以前的BHE建模方法中被很大程度上忽略了,而BHE建模方法是理论预测中大误差的根源。本文提出了一种新的内部源项方法,以解释浅层BHE的性能对土壤温度的(季节性)波动的影响。所提出的模型能够考虑多层中的热流。使用显式有限差分法求解模型的控制方程。使用实验数据对模型进行验证。在有和没有内部热源条件下的模拟土壤温度表明,最大相对误差分别为3.7%和14%。使用高导热率的灌浆会降低井眼的热阻。连续运行模式下的出口流体温度高于间歇运行模式下的流体温度。

更新日期:2020-11-23
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