与恒速离心式制冷机相比，变速离心式制冷机在冷却需求的部分负荷比和扬程的部分压缩比下的性能更高。磁力轴承技术进一步提高了变速离心式制冷机的效益。这种性能差异要求重新考虑采用磁力轴承离心式制冷机时最有效的电厂运行。本文针对德克萨斯农工大学系统校区的无油冷水机组，开发了一个基于组件的模型。该模型由楼宇自动化系统的现场测量数据校准，用于评估不同运营策略的节约成本。基于最优效率曲线，分别在恒定水流量和可变水流量情况下，对案例研究电厂的最优冷水机组分段策略进行了模拟。结果表明，优化的冷水机组分级只会使电厂性能提高2%。 恒定水流量系统为1%。与案例研究电厂的当前运行相比，采用可变水流量实施最佳分段将使节能率提高到13.7%。引用:佛罗里达州奥兰多2020年冬季会议技术论文

Variable speed centrifugal chillers perform much moreefficiently at part-load ratio of cooling demand as well aspartial compression ratio of lift head compared to constantspeed centrifugal chillers. Magnetic bearing technologyfurther improves the benefit of variable speed centrifugalchillers. This performance difference requires a reconsiderationof most effective plant operation when magnetic bearingcentrifugal chillers are incorporated. In this paper, a component-based model is developed for a chilled-water plant withoil-free chillers at the Texas A&M University System RELLISCampus. The model, calibrated by on-site measured data fromthe building automation system, is used to evaluate the savingspotential for different operation strategies. An optimal chillerstaging strategy, based on the optimal efficiency curve, is simulatedfor the case study plant under constant water flow andvariable water flow scenarios respectively. The results showthat optimal chiller staging only improves plant performanceby 2.1% for the constant water flow system. Implementing optimalstaging with variable water flow would increase theenergy savings to 13.7% compared to current operation of thecase-study plant.