变流量泵广泛应用于暖通空调系统，以减少每年的能源消耗。本文评估了四种地热和水循环热泵应用中变流量泵送系统的性能。此外，酒店还配备了一台变频泵（VFD）和一台变频泵。第四个应用是在主回路泵上安装VFD的水回路热泵系统。在所有四个设施中，都使用了详细的监测来评估系统的性能。可变流量泵的使用使所有建筑物都节能。然而，节省的程度取决于几个因素，包括使用的压差设定点以及两者是否相同- 每个热泵上的单向阀工作正常。与恒速泵运行相比，测得的可变流量节省在36%到88%之间。通过实施或评估更优化的泵送系统性能，所有站点的节能都超过了70%。这些可变流量系统的简单回报期从1.7年到3.8年不等。这些建筑的运行经验表明，设计师和安装人员必须解决可变流量安装的所有细节，以确保最大可能的节约。这些细节包括适当的双向阀操作、设计尽可能小的旁通流量、指定具有较小水头损失或压力要求的阀门和其他部件，以及操作系统以保持适度的不同工作压力（e。 g、 ，低于10磅/平方英寸[69千帕]）。单位:双引文:研讨会，ASHRAE交易，第106卷，pt。2.

Variable flow pumping is widely used in HVAC applications to reduce annual energy use. This paper evaluates the performance of variable flow pumping systems in four geothermal and water loop heat pump applications. The geothermal heat pump facilities included a high school with a staged pumping system as well as a hotel and a restaurant with variable frequency driven (VFD) loop pumps. The fourth application was a water loop heat pump system with VFDs on the main loop pumps. At all four facilities, detailed monitoring was used to evaluate the performance of the systems. The use of variable flow pumping resulted in energy savings at all of the buildings. However, the magnitude of the savings depended on several factors, including the differential pressure set point that was used as well as whether the two-way valves on each heat pump operated properly. The measured variable flow savings ranged between 36% and 88% compared to constant speed pump operation. With more optimal pumping system performance either implemented or evaluated, the energy savings at all sites exceeded 70%. Simple paybacks on these variable flow systems ranged from 1.7 to 3.8 years. The operating experiences from these buildings demonstrate that designers and installers must address all details of the variable flow installation to ensure the maximum possible savings. These details include proper two-way valve operation, designing in the minimum possible bypass flow, specifying valves and other components with small head losses or pressure requirements, and operating the system to maintain a modest differ-ential operating pressure (e.g., under 10 psi [69 kPa]).Units: Dual