In order to take advantage of different forms of heat pumps and to mitigate thermal imbalance underground caused by long-term operation of ground source heat pumps, hybrid ground source heat pump systems have received an increasing attention. In this research, based on the fact that abundant groundwater resources are commonly available in karst regions, a new strategy is introduced for selecting and determining hybrid ground source heat pump capacity. Five scenarios of hybrid ground source heat pump system coupling groundwater source heat pumps with other supplementary heat pumps are proposed in this article to provide appropriate options to eliminate heat buildup under different hydrogeologic conditions. Methodologies for sizing and selection are established. Then, a case study of techno-economic analysis was performed for a project in the karst region in South China. The results showed that these scenarios can effectively mitigate heat buildup, and under the hydrogeologic condition in the case study. Compared to the solo ground-coupled heat pump solution, the optimal solution (Solution 4 in this study) can reduce the annual costs by 16.10% and reduce the capital investment by 60%. Methodologies developed in this study are beneficial for selecting appropriate approaches to mitigate heat buildup and enhance competitiveness of ground source heat pumps.

中文翻译：

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喀斯特地区混合式地源热泵选型及技术经济分析

为了充分利用不同形式的热泵并缓解地源热泵长期运行引起的地下热失衡，混合式地源热泵系统受到越来越多的关注。本研究根据喀斯特地区普遍存在丰富的地下水资源的特点，提出了混合地源热泵容量选择和确定的新策略。本文提出了将地下水源热泵与其他补充热泵耦合的混合地源热泵系统的五种方案，以提供适当的选择来消除不同水文地质条件下的热量积聚。确定规模和选择的方法。然后，对华南喀斯特地区的一个项目进行了技术经济分析的案例研究。结果表明，这些情景可以有效地缓解热量积聚，并且在案例研究的水文地质条件下。与单独的地耦合热泵解决方案相比，最优解决方案（本研究中的解决方案4）可以降低16.10%的年成本，并减少60%的资本投资。本研究开发的方法有利于选择适当的方法来减轻热量积聚并提高地源热泵的竞争力。