Abstract Ground heat exchangers are key component of ground-coupled heat pump systems, and their thermal response is therefore very important for ground-coupled heat pump system design and operation. This paper proposes a new hourly simulation method, and uses it to study the performance improvement potential for the ground-coupled heat pump system. First, with an effective U-pipe shank spacing determined by the calculated and measured borehole thermal resistance, a reasonable and accurate fluid temperature prediction method is developed, and the hourly energy performance simulation method is also proposed accordingly with the Fast Fourier Transform superposition algorithm. This hourly simulation method is validated using experimental data collected from a well-designed ground-coupled heat pump experiment platform, which shows that the maximum absolute error for the predicted fluid temperature is smaller than 1.04 °C. Second, using the proposed hourly simulation method, a framework for the energy performance simulation of an office building served by the ground-coupled heat pump system is developed. Impact factors on ground-coupled heat pump system performance are systematically analyzed using this simulation method, and the results show that performance can be improved with shorter operation schedules and lower heat fluxes.

中文翻译：

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地面耦合热泵系统服务的办公楼能源性能的每小时模拟方法

摘要 地热换热器是地耦合热泵系统的关键部件，其热响应对地耦合热泵系统的设计和运行具有重要意义。本文提出了一种新的每小时模拟方法，并用它来研究地耦合热泵系统的性能改进潜力。首先，通过计算和实测的井眼热阻确定有效的U形管柄间距，开发了一种合理准确的流体温度预测方法，并相应地提出了基于快速傅立叶变换叠加算法的每小时能量性能模拟方法。使用从精心设计的地面耦合热泵实验平台收集的实验数据验证了这种每小时模拟方法，这表明预测流体温度的最大绝对误差小于 1.04 °C。其次，使用建议的每小时模拟方法，开发了一个由地面耦合热泵系统服务的办公楼的能源性能模拟框架。使用该模拟方法系统地分析了地耦合热泵系统性能的影响因素，结果表明，可以通过更短的运行时间表和更低的热通量来提高性能。