本文的目的是量化在水环热泵系统中使用变频驱动（VFD）泵所产生的功率需求。首先回顾此类系统的运行情况，并在适当考虑泵、电动机和VFD中的各种低效率的情况下，计算所需的泵送功率。然后导出无量纲功率曲线，并将其表示为各种DPS/DPt比率下无量纲流量的函数（其中DPS为差压开关设置，DPt为标称运行条件下的总水头要求）。这些通用曲线可用于任何特定项目。这些无量纲功率曲线的生成产生了有趣的结果。例如，研究表明，对于给定的dps/DPt值，无量纲功率曲线基本上与泵曲线的斜率和泵效率无关。 此外，研究还表明，所需的泵送功率变化与经典泵送定律有显著不同，经典泵送定律认为功率随流量的立方变化。无量纲功率曲线的实用性通过实际应用得到证明。单元:双引文:研讨会，ASHRAE交易，第105卷，第。1999年2月2日，西雅图

The objective of this paper is to quantify the power requirements resulting from the use of a pump driven by a variable frequency drive (VFD) in a water loop heat pump system. The operation of such a system is first reviewed and the required pumping power is calculated with a proper account of the various inefficiencies in the pump, the electric motor, and the VFD. Nondimensional power curves are then derived and are presented as a function of nondimensional flow rate for various ratios ofDPs/DPt(whereDPsis the differential pressure switch setting andDPtis the total head requirement at the nominal operating conditions). These general curves can be used for any specific project. The generation of these nondimensional power curves has led to interesting results. For instance, it is shown that, for a given value ofDPs/DPt, the nondimensional power curves are essentially independent of the slope of the pump curve and of pump efficiency. Furthermore, it is shown that the required pumping power variation is significantly different from the classic pump law which states that power varies with the cube of the flow rate. The usefulness of the nondimensional power curves is then demonstrated by looking at a practical application.Units: Dual