Arrangement of pipe group and type of ground heat exchangers (GHEs) are crucial engineering design factors affecting the ground source heat pump system (GSHPS) performance. Taking an office building as the object, based on the built three-dimensional simulation platform considering heat and moisture transfer, seepage and freezing, the influence of these two design factors on the GSHPS is simulated. Results show that the influence of moisture transfer on heat transfer of GHEs is smaller. When the pipe group is arranged in staggered and square arrangements and the type of GHEs is single-U, the soil freezing degree is more serious. After 5 years of operation, the effect of pipe group with linear arrangement and GHEs with W and double-U types on improving the system performance is more obvious. Average coefficient of performance (COP) with linear arrangement increases by 14.82% and 12.10% in cooling mode, and 20.62% and 16.98% in heating mode, compared with staggered and square arrangements. Average COP with W and double-U types increases by 20.30% and 25.49% in cooling mode, and 23.77% and 29.43% in heating mode, compared with single-U type. Moisture transfer, seepage and freezing can improve the heating COP, but only seepage can improve the cooling COP.

管道组的布置和地热交换器 (GHE) 的类型是影响地源热泵系统 (GSHPS) 性能的关键工程设计因素。以某办公楼为对象，基于所搭建的考虑热湿传递、渗流和冻结的三维仿真平台，模拟了这两个设计因素对GSHPS的影响。结果表明，水分传递对GHEs传热的影响较小。当管组交错排列、方形排列且GHE类型为单U型时，土壤冻结程度更严重。经过5年的运行，线性布置的管组和W型和双U型的GHE对系统性能的提高效果更加明显。与交错排列和方形排列相比，线性排列的平均性能系数（COP）在冷却模式下提高了14.82%和12.10%，在加热模式下提高了20.62%和16.98%。与单U型相比，W型和双U型在制冷模式下的平均COP提高了20.30%和25.49%，在加热模式下提高了23.77%和29.43%。水分转移、渗流和冻结可以提高加热COP，但只有渗流才能提高冷却COP。