提出了一种实用的混合式地热热泵（GHP）系统设计方法，该系统使用安装在垂直钻孔中的闭环地热交换器。混合GHP系统的设计困难本质上是一个优化问题，最好通过基于计算机的系统仿真方法来解决。许多参数可以优化，目标函数没有唯一的表达式。在这项工作中，优化问题被定义为通过最小化钻孔换热器长度和适当调整补充设备的尺寸来平衡地面上的年度热负荷。本工作中检查的补充设备仅限于直接接触式蒸发冷却塔。GHP系统的设计方法是根据91个详细的计算机模拟结果开发的。使用白金汉Pi定理确定了包含关键GHP设计参数的三个无量纲组，并与拟合曲面方程相关联。 根据从业人员可获得的典型设计参数，此处开发的设计方法可用于估算独立GHP系统的总地面回路长度，以及平衡年度地面负荷所需的年度能量。设计人员还可以使用其他输入参数，计算冷却塔的容量，以及相应缩短的钻孔换热器长度。冷却塔容量采用年等效满载小时概念计算。单位:SICitation:ASHRAE Transactions，第115卷，pt。2、路易斯维尔2009

A practical method for designing hybrid geothermal heat pump (GHP) systems that use closed-loop, earth heat exchangers installed in vertical boreholes is presented. The design difficulty with hybrid GHP systems is inherently an optimization problem that is best solved with a computer-based system simulation method. Many parameters can be optimized and there is no unique expression of the objective function. In this work the optimization problem is defined as balancing the annual thermal loads on the ground by minimizing the borehole heat exchanger length and appropriately sizing supplemental equipment. The supplemental equipment examined in this work has been limited to direct-contact evaporative cooling towers.The design method for GHP systems was developed from results of 91 detailed computer simulations. Three dimensionless groups containing key GHP design parameters were identified using the Buckingham Pi Theorem, and correlated with a fitted surface equation. With typical design parameters available to a practitioner, the design method developed here can be used to estimate the total ground loop length for stand-alone GHP systems, along with the quantity of annual energy required to balance the annual ground loads. With additional input parameters also readily available to designers, the capacity of a cooling tower can be calculated, along with the corresponding reduced borehole heat exchanger length. Cooling tower capacity is calculated using an annual equivalent full load hour concept.\Units: SI