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A numerical study on utilizing horizontal flat-panel ground heat exchangers in ground-coupled heat pumps

机译：地面耦合热泵中利用水平平板地面热交换器的数值研究

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Horizontal ground heat exchangers (GHEs) have a lower cost in comparison to vertical ones; however, they require more land area. For the sake of reducing the required land area for horizontal GHEs, flatpanel GHEs have been recently introduced. In this piece of research, a 3-D numerical model has been developed to predict the thermal performance of flat-panel GHEs. In this study, at first, the thermal performance of a flat-panel GHE has been compared with that of linear horizontal ones. The results demonstrate that the flat-panel GHE has a better thermal performance of about 27% in comparison to an arrangement of linear GHEs with a value of 0.5 m for pipe spacing. In the second part of this study, the effects of three different parameters including soil thermal conductivity, buried depth, and the width of the flat-panel GHE on the thermal performance of the GHE have been investigated. The obtained results show that even though increasing buried depth enhances the thermal performance, the rate of enhancement decreases at the same time. Furthermore, it is established that increasing width is not of great significance when the GHE is more than 10 m wide. (C) 2019 Elsevier Ltd. All rights reserved.
机译：与立式地面换热器相比，卧式地面换热器的成本较低。但是，它们需要更多的土地面积。为了减少水平GHE所需的土地面积，最近引入了平板GHE。在这项研究中，已经开发出3-D数值模型来预测平板GHE的热性能。在本研究中，首先，将平板GHE的热性能与线性水平GHE的热性能进行了比较。结果表明，与管道间距为0.5 m的线性GHE布置相比，平板式GHE具有更好的热性能，约为27％。在本研究的第二部分中，研究了土壤导热系数，埋深和平板式GHE的宽度这三个不同参数对GHE的热性能的影响。所得结果表明，即使增加埋深也能提高热性能，但提高速率却同时降低。此外，可以确定的是，当GHE大于10 m时，增加宽度并不是很重要。 （C）2019 Elsevier Ltd.保留所有权利。

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