This study introduces a new, efficient, and cost-effective spacer to maintain the space between the upward and downward U-tube legs of a single U-tube with an oval cross-section. Therefore, short-term and long-term transient numerical simulations were performed to compare the thermal and energy performance of the ground source heat pump system with both a single U-tube with an oval cross-section coupled with a novel spacer, and a conventional single U-tube with a circular cross-section. The impact of using different spacer cross-sections (circular cross-section, oval cross-section, and an oval cross-section with fins, double spacers with circular cross-section), materials, and length on the thermal performance was examined. Finally, a straightforward economic study was implemented to examine the feasibility of utilizing the proposed spacer. A single aluminum spacer with oval and fins cross-section decreases the borehole thermal resistance (R_b) by 25 % and 28 % compared with single U-tube with an oval cross-section and single U-tube with a circular cross-section, respectively. Furthermore, it improves the coefficient of performance (COP) in winter by 9.5 % compared with single U-tube with circular cross-section. Thus, it saves 497 kW·h operating energy. Finally, the economic study shows that the simple payback period for using the single aluminum spacer with oval and fins cross-section of length 50 m is 3.8 y.

这项研究引入了一种新的，高效且具有成本效益的垫片，以保持具有椭圆形横截面的单个U型管的上下U型管腿之间的空间。因此，进行了短期和长期的瞬态数值模拟，以比较具有椭圆形横截面的U型管和新型隔圈以及常规隔振器的地源热泵系统的热能性能。具有圆形横截面的单个U型管。研究了使用不同的垫片横截面（圆形横截面，椭圆形横截面和带鳍的椭圆形横截面，圆形横截面的双垫片），材料和长度对热性能的影响。最后，进行了一项简单的经济研究，以检验利用建议的垫片的可行性。与具有椭圆形横截面的单个U型管和具有圆形横截面的单个U型管相比，R _b）分别降低了25％和28％。此外，与具有圆形横截面的单个U型管相比，它在冬天将性能系数（COP）提高了9.5％。因此，它可以节省497 kW·h的运行能量。最后，经济研究表明，使用椭圆形和鳍形横截面长度为50 m的单个铝制隔圈的简单投资回收期为3.8 y。