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Parametric investigation of helical ground heat exchangers for heat pump applications

机译：用于热泵应用的螺旋地面热交换器的参数研究

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摘要

The installation cost and performance of ground source heat pump (GSHP) systems can greatly be affected by application parameters of ground heat exchangers (GHEs). These parameters affecting the helical GHE's performance are their spacing, major diameter and pitch length. In large scale GSHP applications, more than one GHE is needed. Therefore determining the distance between GHEs (spacing) becomes as an important issue. In this work, the effect of distance between vertical helical GHEs on the heat transfer rate (HTR) is studied. Performance of helical GHE is determined for different spacing and the proper distance is examined. Furthermore, the influences of the pitch length (L-p) as well as major diameter (D) of GHE on HTR value are numerically studied in COMSOL environment. The available experimental data are used to validate the numerical results. Computational results show that they are in good agreement with the experimental one. The proper distance between GHEs is suggested as 7 m and more. Furthermore the results of the simulations prove that 100% changes in L-p and D can affect the performance of GHE only in order of 10% although the excavation cost increase more than 10%. The results provide useful guidance for optimum design of vertical helical GHE for GSHP systems. (C) 2016 Elsevier B.V. All rights reserved.
机译：地源热泵（GSHP）系统的安装成本和性能会受到地热交换器（GHE）的应用参数的极大影响。这些影响螺旋GHE性能的参数是它们的间距，大直径和节距长度。在大规模GSHP应用中，需要多个GHE。因此，确定GHE之间的距离（间距）成为重要问题。在这项工作中，研究了垂直螺旋GHE之间的距离对传热率（HTR）的影响。确定螺旋GHE在不同间距下的性能，并检查适当的距离。此外，在COMSOL环境中，数值研究了GHE的节距长度（L-p）和大直径（D）对HTR值的影响。可用的实验数据用于验证数值结果。计算结果表明，它们与实验结果吻合良好。建议GHE之间的适当距离为7 m以上。此外，模拟结果证明，尽管开挖成本增加了10％以上，但L-p和D的100％变化仅会影响GHE的性能，仅为10％左右。研究结果为GSHP系统的垂直螺旋GHE的优化设计提供了有用的指导。 （C）2016 Elsevier B.V.保留所有权利。

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