Direct comparison between horizontal and vertical ground-loop systems for a ground source heat pump system

地源热泵系统以其高效能的特点，成为一种极具吸引力的建筑替代供热制冷系统。对于利用地面作为热源或汇的地源热泵系统，安装地回路进行热量交换。接地回路有两种配置，即水平和垂直。每种配置都有优点和缺点。水平接地回路水平埋在沟槽中，埋深一般在2m左右，安装成本较低。根据所需地环长度的不同，所需的土地面积可以很大；因此，该配置可能不适用于城市环境。然而，垂直接地回路垂直安装在钻孔中，长度通常为75 m至200 m，其安装成本通常较高。垂直井田通常比水平沟田占用更少的土地面积。然而，当土地面积不是一个问题时，如在郊区和乡村地区，两种配置都可以使用。在公开的文献中，分别对每一种地环路构型进行了大量的研究。但是，没有哪一项研究是用同一栋建筑的热泵同时研究这两种地回路配置的。

The ground source heat pump (GSHP) system is an attractive alternative heating and cooling system for buildings, because of its high efficiency. For a ground source heat pump system, which utilizes the ground as the heat source or sink, a ground loop is installed to exchange heat. There are two ground loop configurations, namely: horizontal and vertical. There are pros and cons for each configuration. The horizontal ground loops are buried horizontally in trenches, usually down to about 2-m depth, and their installation costs are usually lower. Depending on the required ground-loop length, the required land area can be large; therefore, this configuration may not be applicable to urban environment. However, the vertical ground loops are installed vertically in boreholes, usually up to 75 m to 200 m in length, and their installation costs are usually higher. The vertical borehole fields usually occupy less land areas than the horizontal trench fields. Nonetheless, when land area is not a concern, as in suburban and country-side regions, both configurations can be used. There are a number of studies on each ground-loop configuration separately in the open literature. But none has both ground-loop configurations studied simultaneously with the same heat pump for a building.