地热（地源）热泵（GHP）是传统建筑空调方法的有效替代品。然而，由于地面换热器的存在，GHP系统的安装成本相对较高。交换器的适当尺寸对性能至关重要。垂直U形管换热器通常用作地下换热器，但由于其独特的传热情况，其设计和运行性能的确定非常困难。提出了一种基于有限差分法的U型管换热器模型，可用于系统设计和年度性能模拟。单位:双关键词:1997年，热泵，地热能，计算，热交换器，比较，热流引用: 研讨会，ASHRAE交易，第103卷，第2部分，波士顿1997年

Geothermal (ground-source) heat pumps (GHPs) are an efficient alternative to conventional methods of conditioning buildings. However, GHP systems can have relatively high installation costs because of the ground heat exchanger. Proper sizing of the exchanger is critical to performance. Vertical U-tube heat exchangers are commonly used as the ground heat exchanger, but the design and determination of the operating performance is difficult because of the unique heat transfer situation. Proposes a U-tube heat exchanger model based on finite-difference methods that can be used in system design and annual performance simulations.Units: DualKEYWORDS: year 1997, Heat pumps, geothermal energy, calculating, heat exchangers, comparing, heat flow